GOST R 52203-2004 Tubing Pipes and Couplings. Technical Specifications

GOST R 52203-2004

Group V62

NATIONAL STANDARD OF THE RUSSIAN FEDERATION

TUBING PIPES AND COUPLINGS

Technical specifications

Tubing and coupling.

Specifications

OKS 77.140.75

OKP 13 2700

Effective date 2004-09-01

Foreword

1 DEVELOPED BY the “Oil and Gas” Center for Science and Education of Samara State Technical University, the independent scientific and technical company “Neftepromdiagnostika”, and RosNITI

SUBMITTED BY Technical Committee for Standardization TC 357 “Steel and Cast-Iron Pipes and Cylinders”

2 APPROVED AND PUT INTO EFFECT by Resolution of Gosstandart of Russia No. 20-st dated January 19, 2004

3 INTRODUCED FOR THE FIRST TIME

AMENDMENT No. 1 INTRODUCED, approved and put into effect from 01.01.2010 by Order of Rostekhregulirovanie No. 249-st dated 16.07.2009

Amendment No. 1 was incorporated by the database producer based on the text of IUS No. 10, 2009

1 Scope

This standard applies to seamless and electric-welded straight-seam steel tubing pipes and couplings used in the operation and repair of oil and gas wells, as well as wells for other purposes.

3 Dimensional range

3.1 By manufacturing method, pipes are divided into two types: seamless and electric-welded straight-seam.

3.2 Depending on the order, pipes shall be:

• without thread - N;

• smooth with triangular thread and coupling - G;

• with externally upset ends, triangular thread and coupling - V;

• smooth and with externally upset ends and couplings with triangular thread and sealing rings made of non-metallic materials - PG and PV;

• smooth, highly leak-tight, with trapezoidal thread and coupling - T;

• highly leak-tight, couplingless, with externally upset ends and trapezoidal thread - B.

The dimensional range of pipes is given in Table 1.

Table 1 - Dimensional range of pipes

In millimetres

			Strength group of pipes and couplings
Nominal pipe diameter	Nominal outside diameter	Nominal wall thickness		,	,	,	,
27	26.7	3.0	V N		H
		4.0	H
33	33.4	3.5	V G N		H
		4.5	H
42	42.2	3.5	V G N		H
		5.0	H
48	48.3	4.0	V G N		V N
		5.0	H
		6.5
		8.0
60	60.3	5.0	B V G N T
		6.5	H
		7.5
		8.5
73	73.0	5.5	B V G N T
		7.0
		8.0	H
		9.0
		10.0
		11.5
89	88.90	6.0	H
		6.5	B V G N T
		7.5	H
		8.0	B V G N T
		9.5	H
		11.0
		12.0
		13.5
102	101.6	6.0	H
		6.5	B V G N T
		8.5	H
		10.5
		13.0
		15.5
114	114.3	7.0	B V G N T
		8.5	H
		10.0
		11.0
		13.0
		14.5
		16.0
Notes 1 Seamless pipes and couplings are manufactured in strength groups , , , , and ; electric-welded pipes - in groups , , , , and . 2 Pipe designations: N - without thread; G - smooth with triangular thread and coupling; V - with externally upset ends, triangular thread and coupling; T - smooth, highly leak-tight, with trapezoidal thread and coupling; B - highly leak-tight, couplingless, with externally upset ends and trapezoidal thread.

(Amended edition, Amendment No. 1).

3.3 Pipes and couplings shall conform to the dimensions and weights specified:

• for pipes without thread - in Tables 1-5;

• for smooth pipes with triangular thread and couplings - in Figure 1 and Table 2;

• for pipes with externally upset ends, triangular thread and couplings - in Figure 2 and Table 3;

• for smooth, highly leak-tight pipes with trapezoidal thread and couplings - in Figure 3 and Table 4;

• for highly leak-tight, couplingless pipes with externally upset ends and trapezoidal thread - in Figure 4, Table 5 and Section 4 of this standard.

Note - When determining the weight of pipes and couplings given in Tables 2-5, the density of steel is taken as 7.85 g/cm.

Figure 1 - Smooth pipe with triangular thread and coupling

Table 2 - Dimensions and weights of smooth pipes with triangular thread and couplings

In millimetres

	Pipe				Coupling
Nominal pipe diameter	Nominal outside diameter	Nominal wall thickness	Minor diameter	Theoretical weight of 1 m, kg	Outer diameter	Length	Weight, kg
33	33.4	3.5	26.4	2.6	42.2	84.0	0.4
42	42.2	3.5	35.2	3.3	52.2	90.0	0.6
48	48.3	4.0	40.3	4.4	55.9	96.0	0.5
60	60.3	5.0	50.3	6.8	73.0	110.0	1.3
73	73.0	5.5	62.0	9.2	88.9	132.0	2.4
		7.0	59.0	11.4
89	88.9	6.5	75.9	13.2	108.0	146.0	3.6
102	101.6	6.5	83.6	15.2	120.6	150.0	4.5
114	114.3	7.0	100.3	18.5	132.1	156.0	5.1
Note - the theoretical weight of 1 m of pipe body, kg, is determined by the formula
, (1)
where - is the nominal outside diameter of the pipe, mm;
- is the nominal wall thickness of the pipe, mm.

Figure 2 - Pipe with externally upset ends, triangular thread and coupling

Table 3 - Dimensions and weights of pipes with externally upset ends, triangular thread and couplings

In millimetres

	Pipe							Coupling
Nominal pipe diameter	Nominal outside diameter	Nominal wall thickness	Inside diameter	Outside diameter of upset part (tol. ±1.5)	Length of upset part	Theoretical weight of 1 m of smooth pipe, kg	Increase in pipe weight due to upsetting of both ends, kg	Outside diameter	Length	Weight, kg
27	26.7	3.0	20.7	33.4	40.0	1.8	0.1	42.2	84.0	0.4
33	33.4	3.5	26.4	37.3	45.0	2.6	0.1	48.3	90.0	0.5
42	42.2	3.5	35.2	46.0	51.0	3.3	0.2	55.9	96.0	0.7
48	48.3	4.0	40.3	53.2	57.0	4.4	0.4	63.5	100.0	0.8
60	60.3	5.0	50.3	65.9	89.0	6.8	0.7	77.8	126.0	1.5
73	73.0	5.5	62.0	78.6	95.0	9.2	0.9	93.2	134.0	2.8
		7.0	59.0			11.4
89	88.9	6.5	75.9	95.2	102.0	13.2	1.3	114.3	146.0	4.2
		8.0	72.9			16.0
102	101.6	6.5	88.6	108.0		15.2	1.4	127.0	154.0	5.0
114	114.3	7.0	100.3	120.6	108.0	18.5	1.6	141.3	160.0	6.3

Figure 3 - Smooth, highly leak-tight pipe with trapezoidal thread and coupling

Table 4 - Dimensions and weights of smooth, highly leak-tight pipes with trapezoidal thread and couplings

In millimetres

	Pipe				Coupling
Nominal pipe diameter	Nominal outside diameter	Nominal wall thickness	Minor diameter	Weight of 1 m, kg	Outer diameter	Length	Weight, kg
60	60.3	5.0	50.3	6.8	73.0	135.0	1.8
73	73.0	5.5	62.0	9.2	88.9	135.0	2.5
		7.0	59.0	11.4
89	88.9	6.5	75.9	13.2	108.0	155.0	4.1
		8.0	72.9	16.0
102	101.6	6.5	88.6	15.2	120.6		5.1
114	114.3	7.0	100.3	18.5	132.1	205.0	7.4

Figure 4 - Highly leak-tight, couplingless pipe with externally upset ends and trapezoidal thread

Table 5 - Dimensions and weights of highly leak-tight, couplingless pipes with externally upset ends and trapezoidal thread

In millimetres

Nominal pipe diameter	Nominal outside diameter	Nominal wall thickness	Inside diameter	Outside diameter of upset part (tol. ±0.5)	Inside diameter at the end face of the nipple end	Inside diameter at the end of the upset part	Length of upset part	Weight of 1 m of smooth pipe, kg	Increase in pipe weight due to upsetting of ends, kg
60	60.3	5.0	50.3	71.0	53.5	48.3	95.0	6.8	1.8
73	73.0	5.5	62.0	84.0	65.5	60.0	100.0	9.2	2.2
		7.0	59.0	86.0	63.0	57.0		11.4	2.6
89	88.9	6.5	75.9	102.0	79.5	73.9		13.2	3.2
		8.0	72.9	104.0	77.0	70.9		16.0	3.7
102	101.6	6.5	88.6	116.0	92.0	86.6		15.2	4.0
114	114.3	7.0	100.3	130.0	104.0	98.3		18.5	4.8

3.4 The end edges of unthreaded pipes of all strength groups with smooth and externally upset ends shall be deburred.

3.5 At the customer’s request, couplings for pipes with triangular thread, with smooth and externally upset ends, may be manufactured with sealing rings made of non-metallic materials whose technical requirements are not lower than those specified in GOST 10007 for pure polytetrafluoroethylene with 25% fiberglass (Figure 5).

Figure 5 - Coupling with sealing ring made of non-metallic material for smooth pipes and pipes with externally upset ends

(Amended edition, Amendment No. 1).

3.6 Pipes shall be supplied in two length groups, given in Table 6.

Table 6 - Pipe length groups

In meters

Parameter name	Length group
	I	II
Pipe length	6.1-7.3	8.3-10.0
Permissible deviation in length of an individual pipe in a lot:
- seamless	±0.05
- electric-welded straight-seam	±0.01
Notes
1 The length of a pipe is determined as the distance between its ends, and when a coupling is screwed on, as the distance from the free end of the coupling to the end of the thread runout at the opposite end of the pipe.
2 At the customer’s request, pipes of other lengths as specified in the order are permitted.

For 1% or less of the delivery lot of electric-welded pipes, length deviations of not more than 0.25 m are permitted.

3.7 Limit deviations in dimensions and mass of pipes and their couplings shall not exceed the values given in Table 7.

Table 7 - Limit deviations in dimensions and mass of pipes and their couplings

Parameter name		Limit deviations for pipes
		seamless	electric-welded
Outside diameter of pipes:
	up to 102 mm	±0.80 mm	+0.80 mm/ -0.40 mm
	114 mm	±0.90 mm	+1.14 mm/ -0.40 mm
Wall thickness of pipes		-12.5%	-10.0%
Outside diameter of coupling		±1.0%
Length of coupling		±2.0 mm
Mass of an individual pipe		+6.50%/ -3.50%	±3.50%
Mass of a pipe lot up to 60 t		-
Mass of a pipe lot of 60 t or more		-1.75%

An increase in outside diameter above the plus tolerance of up to 1.0 mm is permitted beyond the upsetting transition section, over a length of not more than 100 mm for type V pipes and not more than 150 mm for type B pipes.

Plus deviations in pipe wall thickness are limited by the tolerances on outside diameter and mass of an individual pipe.

(Amended edition, Amendment No. 1).

3.8 On the end sections equal to one third of the length of type G, N and T pipes, and at a distance of 125 to 150 mm beyond the upsetting transition section of type B and V pipes, curvature of more than 1.0 mm per 1 m of length is not permitted.

Curvature measured at the middle of a pipe with a diameter of 114 mm shall not exceed 1/2000 of its length; for pipes of other diameters, curvature is governed by the passage of a cylindrical mandrel through the inside of the pipe.

3.9 When ordering pipes, the customer shall specify the following:

• the pipe designation in accordance with 3.2 of this standard;

• nominal diameter;

• wall thickness;

• strength group;

• length group (range);

• mass (quantity) of pipes;

• designation of this standard.

When ordering couplings, the customer shall specify:

• the coupling designation for the pipe: coupling for pipes with plain ends, type G, or upset ends, type V, with triangular thread; couplings with triangular thread and a sealing ring made of non-metallic materials, type P, or without one; coupling for plain, high-sealing pipes with trapezoidal thread, type T;

• the nominal diameter of the pipe corresponding to the given coupling;

• strength group;

• the presence of a groove for sealing rings made of non-metallic materials and the delivery conditions for the rings (in couplings or separately from them);

• quantity;

• designation of this standard.

Examples of designations for pipes and their couplings are given in Annex A.

3.10 When ordering, the customer may specify additional requirements:

• control of mechanical properties (for example, by impact bend testing of the material at reduced temperatures);

• coating material (other than phosphating) for the coupling thread;

• application of protective coatings to the inner surface of pipes;

• use of special lubricants or sealants when making up threaded connections at the manufacturer’s facility;

• the value of test hydraulic pressures;

• marking and packaging;

• the conditions for inspection of pipes at the manufacturer’s (or supplier’s) facility, as well as other possible additional requirements or agreements.

4 Technical requirements

4.1 Pipes and couplings shall be manufactured in accordance with the requirements of this standard.

4.2 The outer and inner surfaces of pipes and couplings shall be free of scabs, rolled-in impurities, blowholes, laps, delaminations, cracks, tears, burrs and other defects that reduce the operational reliability of the pipes.

Welding, caulking and patching of defective areas are not permitted.

The body of the pipes may have nicks, dents, scratches, scale residues and other damage arising from the production method, as well as grinding and cutting of these along the pipe axis, provided that none of the above causes the wall thickness of a given pipe to exceed the limit minus deviation from its nominal value.

At locations on pipes where the wall thickness can be measured directly, the depth of such damage may exceed the limit minus deviations, provided the minimum wall thickness is maintained, defined as the difference between the nominal pipe wall thickness and the limit minus deviation specified for it in Table 7.

4.3 The outer and inner surfaces of the upset ends of type B and V pipes shall have no more than three damaged areas (repaired or not filled with metal); for each of them the circumferential extent shall not exceed 25.0 mm, the width shall not exceed 15.0 mm, and the depth shall not exceed 2.0 mm.

4.4 The transition surface from the upset part to the main body of a type B or V pipe shall be smooth.

The wall thickness in the transition section of all type B and V pipes shall not be less than the minimum permissible wall thickness of the plain section of the pipe.

On the upset ends of type V pipes, at a distance of (±25) mm from each of its ends, an internal process taper of not more than 1:50 is permitted.

4.5 Electric-welded straight-seam pipes shall have not more than one longitudinal weld seam.

4.6 Seamless pipes shall be manufactured in strength groups , , , , and , while electric-welded pipes shall be manufactured in strength groups , , , , and .

The steel grade shall be selected by the manufacturer taking into account compliance with the mechanical property requirements specified in Table 8.

Table 8 - Mechanical properties of the base metal of pipes and their couplings

Parameter name		Strength group
						,	,	,	,
Tensile strength , N/mm, not less than		517	655	595	687	689	758	823	1000
Yield strength , N/mm:
	min	379	379	491	491	552	654	724	930
	max	552	-	600	-	758	862	921	1137
Elongation , %, not less than		18.0	14.3	15.0	14.0	13.0	12.3	11.3	9.5
Brinell hardness HB, not more than		-				255	295	305	335
Notes 1 Mechanical property tests are carried out at a temperature of (20±3) °C. 2 At the customer’s request, impact bend tests may be carried out at a reduced temperature; the temperature and the impact toughness value at that temperature shall be agreed between the manufacturer and the customer. 3 The manufacturer and the customer may agree on other tensile strength values for the base metal of electric-welded pipes of strength groups , , , , , . 4 Hardness requirements are optional.

(Amended edition, Amendment No. 1).

4.7 Couplings for pipes of all strength groups shall be manufactured only from seamless pipes.

Couplings may be manufactured from individual coupling blanks.

The mechanical properties of coupling steels shall correspond to the properties of the pipe steels for which they are intended. When manufacturing threaded pipes with couplings, it is permitted to use couplings manufactured in accordance with GOST 633.

(Amended edition, Amendment No. 1).

4.8 The mechanical properties of the pipe and coupling metal shall correspond to the characteristics given in Table 8.

4.9 The mass fractions of sulfur and phosphorus, %, in steels of the strength groups shall be:

• , , , , and - not more than 0.025 of each element;

• , , , , and - not more than 0.020 phosphorus and not more than 0.015 sulfur.

At the customer’s request, the mass fractions of sulfur and phosphorus in steels may be lower, in accordance with the order.

4.10 Type B pipes without couplings and type V pipes with upset ends, of all strength groups, as well as all pipes of strength group and above and their couplings (coupling blanks), shall undergo heat treatment or thermomechanical treatment over their entire length. For electric-welded pipes of strength groups and , local heat treatment of the weld joint after removal of the flash at a temperature not lower than 538 °C is permitted.

4.11 For electric-welded pipes, the manufacturer shall develop regulatory documents for the resistance welding process ensuring the quality characteristics of welded joints for pipes of all sizes and strength groups typical of the specific production.

4.12 For electric-welded pipes of strength groups and , the manufacturer shall agree the pipe production quality control plan with the customer.

4.13 External and internal flash shall be removed flush with the base metal.

Internal flash on pipes with a height not exceeding 0.30 mm is permitted.

At the location where the flash is removed, thinning of the pipe wall is permitted, provided the thickness does not go beyond the minus tolerance limit.

4.14 The tensile strength values of the weld joint shall be not less than the values given in Table 8 for the corresponding strength groups.

4.15 The hardness values of the metal in the weld joint zones of electric-welded pipes of strength groups and above, and of the metal of seamless pipes and couplings, shall not exceed the values specified in Table 8.

4.16 Electric-welded pipes shall withstand the flattening test.

The distance between parallel plates after the test shall not exceed the values specified in Table 9.

Table 9 - Distance between parallel plates after the flattening test of electric-welded pipe specimens

In millimetres

Nominal pipe diameter	Strength group	Distance between parallel plates
27-89; 102 (except wall thickness 6.0 mm) and 114 (except wall thickness 7.0 mm)		(0.98-0.0206 )
	and	(1.074-0.0194 )
		(1.086-0.0163 )
102 (with wall thickness 6.0 mm) and 114 (with wall thickness 7.0 mm)		0.70
	and	0.75
		0.78
Notes
1 The distances between parallel plates for electric-welded pipes of strength groups and are established by agreement between the manufacturer and the customer.
2 Designations:
- nominal outside diameter of pipes, mm;
- is the nominal wall thickness of the pipe, mm.

4.17 When pipes are supplied with couplings, the latter shall be tightened onto the pipes using a coupling make-up machine.

At the customer’s request, pipes may be supplied with couplings screwed on by hand, or pipes and couplings may be supplied separately.

4.18 The threads and sealing taper bores of couplings shall have a phosphate, zinc, or other coating agreed with the customer, with a thickness from 6 to 20 µm.

The coating thickness shall be ensured by the manufacturer through the pipe and coupling production technology.

The coatings of the threads and sealing taper surfaces of type B pipes shall be agreed by the customer with the manufacturer.

4.19 At the customer’s request, the outer surface of each pipe and coupling shall be painted or protected with a preservative coating.

(Amended edition, Amendment No. 1).

4.20 At the customer’s request, pipes may be manufactured with protective coatings on the internal surface, applied in accordance with technical documentation approved in the prescribed manner.

4.21 When screwing pipes into couplings, thread lubricant per [1] shall be used, ensuring joint tightness and protecting the thread against galling.

At the customer’s request, special lubricants or sealants for threaded joints may be used.

4.22 Pipes after upsetting and heat treatment (if performed), with couplings screwed on, as well as pipes supplied without couplings, shall withstand, over their entire length, an internal hydraulic pressure test without leakage. If pipes are subjected to hydraulic testing before thread cutting, then after thread cutting and screwing pipes into couplings, it is permissible to perform hydraulic testing of the threaded joints only.

The calculated test pressure values for pipes are given in Table 10.

Table 10 - Internal hydraulic test pressure values for pipes

Nominal pipe diameter, mm	Nominal wall thickness , mm	Test pressure , MPa (kgf/cm), for pipes of strength groups
27	3.0	68.1 (696)	88.3 (899)	99.2 (1010)	117.6 (1201)	122.6 (1250)
	4.0	90.8 (928)	103.0 (1199)	122.6 (1250)
33	3.5	63.5 (649)	82.3 (838)	92.6 (942)	109.7 (1120)	121.4 (1237)	122.6 (1250)
	4.5	81.7 (834)	105.8 (1078)	119.0 (1211)	122.6 (1250)
42	3.5	50.5 (515)	65.2 (665)	73.6 (750)	86.8 (886)	96.1 (979)	122.6 (1250)
	5.0	71.8 (734)	93.1 (948)	107.6 (1065)	122.6 (1250)
48	4.0	50.2 (513)	65.1 (663)	73.1 (745)	86.7 (885)	95.9 (978)	122.6 (1250)
	5.0	62.8 (641)	81.3 (828)	91.4 (931)	108.3 (1106)	119.9 (1222)	122.6 (1250)
	6.5	81.6 (833)	105.7 (1077)	118.9 (1210)	122.6 (1250)
	8.0	100.4 (1026)	122.6 (1250)
60	5.0	50.3 (513)	65.1 (663)	73.2 (746)	86.8 (886)	96.1 (979)	122.6 (1250)
	6.5	65.4 (667)	84.7 (862)	95.2 (969)	112.8 (1152)	122.6 (1250)
	7.5	75.4 (770)	97.7 (995)	109.9 (1118)	122.6 (1250)
	8.5	85.5 (873)	110.7 (1128)	122.6 (1250)
73	5.5	45.7 (467)	59.2 (603)	66.5 (677)	78.8 (805)	87.3 (890)	112.1 (1144)
	7.0	58.1 (594)	75.3 (767)	84.7 (862)	100.3 (1025)	111.1 (1132)	122.6 (1250)
	8.0	66.5 (679)	86.1 (877)	96.8 (985)	114.7 (1171)	122.6 (1250)
	9.0	74.8 (763)	96.9 (986)	108.9 (1109)	122.6 (1250)
	10.0	83.1 (848)	107.6 (1096)	121.0 (1232)	122.6 (1250)
	11.5	95.5 (975)	122.6 (1250)
89	6.0	40.9 (453)	53.0 (540)	59.6 (607)	70.6 (721)	78.2 (797)	100.4 (1025)
	6.5	44.3 (453)	57.4 (585)	64.6 (657)	76.5 (781)	84.7 (863)	108.8 (1110)
	7.5	51.2 (522)	66.3 (675)	74.5 (759)	88.3 (902)	97.7 (996)	122.6 (1250)
	8.0	54.6 (557)	70.7 (720)	79.5 (809)	94.2 (962)	104.2 (1063)	122.6 (1250)
	9.5	64.8 (662)	84.0 (855)	94.4 (961)	111.8 (1142)	122.6 (1250)
	11.0	75.0 (766)	97.2 (990)	109.3 (1113)	122.6 (1250)
	12.0	81.9 (836)	106.0 (1080)	119.2 (1214)	122.6 (1250)
	13.5	92.1 (940)	119.3 (1215)	122.6 (1250)
102	6.0	35.8 (366)	46.4 (472)	52.2 (531)	61.8 (631)	68.4 (697)	87.9 (897)
	6.5	38.8 (396)	50.3 (512)	56.5 (575)	66.9 (684)	74.1 (755)	95.2 (971)
	8.5	50.7 (518)	65.7 (669)	73.9 (752)	87.5 (894)	96.9 (988)	122.6 (1250)
	10.5	62.7 (640)	81.2 (827)	91.3 (929)	108.1 (1105)	119.7 (1220)	122.6 (1250)
	13.0	77.6 (792)	100.5 (1024)	122.6 (1250)
	15.5	92.5 (945)	119.9 (1220)	122.6 (1250)
114	7.0	37.1 (379)	48.1 (490)	54.1 (551)	64.1 (655)	70.9 (723)	91.1 (930)
	8.5	45.1 (460)	58.4 (595)	65.7 (669)	77.8 (795)	86.1 (878)	110.7 (1129)
	10.0	53.1 (542)	68.7 (700)	77.3 (787)	91.5 (935)	101.3 (1033)	122.6 (1250)
	11.0	58.4 (596)	75.6 (770)	85.0 (865)	100.7 (1029)	111.5 (1136)	122.6 (1250)
	13.0	69.0 (704)	89.4 (910)	100.5 (1023)	119.0 (1216)	122.6 (1250)
	14.5	76.9 (786)	99.7 (1015)	112.0 (1141)	122.6 (1250)
	16.0	84.9 (867)	110.0 (1120)	122.6 (1250)
Note - The internal hydraulic test pressure values given, MPa (kgf/cm), are determined using the following formulas:
; (2)
, (3)
where is the nominal wall thickness, mm; is the nominal outside diameter of the pipe, mm; is the allowable stress, MPa (kgf/cm), taken equal to 0.8.

If the calculated test pressure exceeds 68.6 MPa (700 kgf/cm), the pipe is tested at a pressure not exceeding 68.6 MPa (700 kgf/cm).

At the customer’s request, the test pressure is taken equal to the calculated value, but in any case the pressure shall not exceed 122.6 MPa (1250 kgf/cm).

By agreement between the manufacturer and the customer, the test pressure may be limited to:

19.7 MPa (200 kgf/cm) - for pipes of strength groups ;

29.4 MPa (300 kgf/cm) - for pipes of strength groups and above.

(Amended edition, Amendment No. 1)

4.23 The basic dimensions of connections of plain pipes with triangular thread and couplings for them are given in Figures 6-8 and Tables 11-14.

Figure 6 - Thread profile shape of plain pipes and pipes with externally upset ends, and couplings for them

Figure 7 - Thread and connection dimensions of plain pipes and pipes with externally upset ends, and couplings for them

Figure 8 - Diagram for determining thread interference of plain pipes and pipes with externally upset ends, and couplings for them

Table 11 - Thread dimensions of plain pipes and pipes with externally upset ends, and couplings for them

In millimetres

Parameter name	Value of the parameter for the number of thread turns (over a length of 25.4 mm)
	10	8
Thread pitch	2.540	3.175
Height of basic profile *	2.200	2.750
Profile height	1.412	1.810
Working height of profile *	1.336	1.734
Profile angle *	60°
Angle of inclination of the profile side	30°±1°
Fillet radius:
profile crest	0.432	0.508
profile root	0.356	0.432
Clearance *	0.076
Taper angle	1°47’24”
Taper 2	1:16
* Dimensions for reference.
Notes
1 Thread pitch is measured parallel to the thread axis of the pipe and coupling.
2 Limit deviations of the radius values and are given for the design of thread-forming tools and are not subject to inspection.

Table 12 - Limit deviations from nominal dimensions for triangular thread of plain pipes and pipes with externally upset ends, and couplings for them

In millimetres

Limit deviation
thread pitch		taper (over a thread length of 100 mm)
over a thread length of 25.4 mm	over the entire thread length with full profile	pipe	coupling
±0.075	±0.120	+0.36	+0.22
		-0.22	-0.36

Table 13 - Dimensions of threaded connections of plain pipes and couplings for them

In millimetres

				Thread diameter at the plane of the pipe end face		Pipe thread length
						total (to the end of the thread runout)
Nominal pipe diameter	Outside diameter of pipe	Thread pitch	Pitch diameter of thread in the basic plane *	outside *	inside *	nominal	tolerance	to the basic plane (with full profile) *	thread runout	Inside diameter of thread at the plane of the coupling end face *	Diameter of coupling cylindrical bore (tolerance plus 0.8)	Depth of coupling recess, tolerance	Width of coupling face	Distance from coupling face to the end of thread runout on the pipe at hand-tight makeup (interference)
33	33.4	2.540	32.065	32.382	29.568	29.0	±2.5	16.3	8.0	31.210	35.0	8.0	2.0	5.0
42	42.2		40.828	40.948	38.124	32.0		19.3		39.973	43.8		2.5
48	48.3		46.924	46.866	44.042	35.0		22.3		46.069	49.9		1.5
60	60.3		58.989	58.494	55.670	42.0		29.3		58.134	61.9		4.0
73	73.0		71.689	70.506	67.682	53.0		40.3		70.834	74.6		5.5
89	88.9		87.564	85.944	83.120	60.0		47.3		86.709	90.5		6.5
102	101.6	3.175	99.866	98.519	94.899	62.0	±3.2	49.3	10.0	98.519	103.2	9.5	6.5	6.5
114	114.3		112.566	111.031	107.411	65.0		52.3		111.219	115.9		6.0
* Dimensions for reference.
Note - The end of thread runout is taken as the point of intersection of the generatrix of its runout cone with the generatrix of a cylinder whose diameter equals the outer diameter of the pipe.

Table 14 - Dimensions of the sealing ring installed in couplings of plain-end pipes, and of the internal groove for it

In millimetres

					Sealing ring
Nominal pipe diameter	Nominal outer diameter of pipe	Distance from coupling face to the plane where the groove ends (tolerance ±3.2)	Groove width (tolerance ±0.13)	Groove diameter (tolerance ±0.25)	Outer diameter (tolerance ±0.19)	Thickness (tolerance plus 0.38)	Height (tolerance plus 0.38)
33	33.4	20.7	3.96	34.19	34.62	2.03	3.18
42	42.2			42.95	43.38
48	48.3			48.74	49.20
60	60.3	25.4	4.78	60.81	61.26		3.96
73	73.0			73.51	73.96
89	88.9			89.38	89.84
102	101.6	28.6	4.78	102.31	102.77	2.54
114	114.3			115.01	115.47

4.23.1 The shape and dimensions of the thread profile of plain-end pipes and couplings for them shall comply with those shown in Figure 6 and Table 11.

4.23.2 The dimensions of joints of plain-end pipes and couplings for them shall comply with those shown in Figures 7 and 8 and Tables 11-14.

4.23.3 The minimum wall thickness under the thread in the plane of the pipe end, mm, shall be calculated (rounded to 0.1 mm) using the formula

, (4)

where is the nominal wall thickness, mm;

• is the nominal outer diameter of the pipe, mm;

• is the value of the upper limit deviation of the pipe outer diameter, mm (given in Table 7);

• is the internal thread diameter in the plane of the pipe end, mm.

If the calculated value is less than 1.0 mm for pipes with a nominal diameter up to 48 mm (inclusive) and less than 2.0 mm for other pipe diameters, this value shall be taken as 1.0 and 2.0 mm, respectively.

4.23.4 The formation of a sharp edge on the pipe end where the outer and inner chamfers meet is not permitted.

4.23.5 The dimensions of the internal groove in the coupling for installing a sealing ring made of non-metallic material, and the dimensions of the ring itself, are given in Figure 5 and Table 14.

4.23.6 For the thread-forming tool runout, a groove may be cut in the middle of the coupling to a depth not exceeding the profile height by more than 0.5 mm. The groove shall not have sharp corners (undercuts).

If there is no groove, crossing-over of opposing threads is permitted at a distance, measured from the middle of the coupling in both directions, of not more than (13.0-) mm.

4.23.7 A conical recess is permitted at the coupling face, the generatrix of which shall be parallel to the generatrix of the thread cone.

The smallest diameter of the conical recess shall be equal to the diameter of the cylindrical recess of the coupling.

4.23.8 The limit deviations from nominal dimensions for the triangular thread shall comply with the values given in Table 12.

Limit deviations of thread pitch over a length not exceeding 25.4 mm are permitted for the distance between any two threads with a full profile.

For distances between threads greater than 25.4 mm, an increase in the limit deviations is permitted in proportion to the increase in distance, but not exceeding the values given in Table 12 for the entire length of the full-profile thread.

Limit deviations of taper (deviations from the difference between two diameters) are taken over a thread length of 100 mm and apply to the pitch diameter of the pipe and coupling thread, as well as to the outer diameter of the pipe thread and the internal diameter of the coupling thread.

4.23.9 The interference of the coupling thread, as measured by the thread plug gauge, shall be equal to the interference adopted for hand-tightening couplings with pipes, in accordance with Figure 7 and given in Table 13.

Limit deviations of the interference shall not exceed ±.

Note - The value corresponds to the thread pitch and is taken as 2.5 mm for pipes and couplings with a thread pitch of 2.540 mm, and 3.2 mm for pipes and couplings with a thread pitch of 3.175 mm.

4.23.10 The interference of the pipe thread, as measured by the thread ring gauge, shall be equal to .

Limit deviations of the interference shall not exceed ±.

4.23.11 When hand-tightening couplings with pipes, the interference in accordance with Figure 7 shall be equal to the value given in Table 13.

Limit deviations of the interference when hand-tightening the coupling with the pipe shall not exceed ±.

(Amended edition, Amendment No. 1).

4.23.12 After power-tightening the pipe and coupling on a machine, the coupling face shall coincide with the end of the thread runout on the pipe, in accordance with Figure 7.

Limit deviations of the interference shall not exceed ±.

4.24 The basic dimensions of joints of pipes with external upset ends with triangular thread and couplings for them are given in Figures 5-8 and Tables 11, 12, 15 and 16.

Table 15 - Dimensions of joints of pipes with external upset ends with triangular thread and couplings for them

In millimetres

				Thread diameter at the plane of the pipe end face		Pipe thread length
						total (to the end of the thread runout)
Nominal pipe diameter	Outside diameter of pipe	Thread pitch	Pitch diameter of thread in the base plane	outside *	internal *	nominal	tolerance	to the basic plane (with full profile) *	thread runout	Internal thread diameter in the plane of the coupling face	Diameter of coupling cylindrical bore (tolerance plus 0.8)	Depth of coupling recess, tolerance	Width of coupling face	Distance from coupling face to the end of thread runout on the pipe at hand-tight makeup (interference)
27	33.4	2.540	32.065	32.383	29.568	29.0	±2.5	16.3	8.0	31.210	35.0	8.0	2.0	5.0
33	37.3		35.970	36.100	33.276	32.0		19.3		35.115	38.9		3.0
42	46.0		44.701	44.643	41.819	35.0		22.3		43.846	47.6		2.5
48	53.2		51.845	51.662	48.833	37.0		24.3		50.990	54.8		2.5
60	65.9	3.175	64.148	63.551	59.931	50.0	±3.2	37.3	10.0	62.801	67.5	9.5	3.5	6.5
73	78.6		76.848	76.001	72.381	54.0		41.3		75.501	80.2		4.5
89	95.2		93.516	92.294	88.674	60.0		47.3		92.169	96.9		6.5
102	108.0		106.216	104.744	101.124	64.0		51.3		104.869	109.6		6.5
114	120.6		118.916	117.256	113.636	67.0		54.3		117.569	122.3		7.5
* Dimensions for reference.
Note - The end of thread runout is taken as the point of intersection of the generatrix of its runout cone with the generatrix of a cylinder whose diameter equals the outer diameter of the upset part.

Table 16 - Dimensions of the sealing ring installed in the coupling of pipes with external upset ends, and of the internal groove for it

In millimetres

					Sealing ring
Nominal pipe diameter	Nominal outer diameter of pipe	Distance from coupling face to the plane where the groove ends (tolerance ±3.2)	Groove width (tolerance ±0.13)	Groove diameter (tolerance ±0.25)	Outer diameter (tolerance ±0.19)	Thickness (tolerance plus 0.127)	Height, tolerance
27	26.7	22.2	3.96	34.09	34.54	2.03	3.18
33	33.4			38.00	38.43
42	42.2	22.2	4.78	46.74	47.17	2.03	3.96
48	48.3			53.87	54.31
60	60.3	28.6		66.60	67.06	2.54
73	73.0			79.30	79.76
89	88.9			95.96	96.42
102	101.6			108.66	109.12
114	114.3			121.36	121.82

4.24.1 The shape and dimensions of the thread profile of pipes with external upset ends and couplings for them shall comply with those shown in Figure 6 and Table 11.

4.24.2 The limit deviations from nominal dimensions for the thread shall comply with the requirements given in 4.23.2.

4.24.3 The dimensions of joints of pipes with external upset ends and couplings for them are given in Figures 5 and 7 and Tables 3 and 15.

4.24.4 The groove in the middle of the coupling and the conical recess at its face shall comply with the requirements given in 4.23.6 and 4.23.7, respectively.

4.24.5 The dimensions of the internal groove in the coupling for installing a sealing ring made of non-metallic material, and the dimensions of the ring, are given in Figure 5 and Table 16.

4.24.6 The interference of the coupling thread, as measured by the thread plug gauge, shall be equal to the interference adopted for hand-tightening couplings with pipes, in accordance with Figure 8 and given in Table 15.

Limit deviations of the interference shall not exceed ±.

4.24.7 The interference of the pipe thread, as measured by the thread ring gauge, shall be equal to .

Limit deviations of the interference shall not exceed ±.

4.24.8 When hand-tightening couplings with pipes, the interference shall be equal to the value given in accordance with Figure 7 and Table 15.

Limit deviations of the interference when hand-tightening the coupling with the pipe shall not exceed ±.

4.24.9 After power-tightening the pipe and coupling on a machine, the coupling face shall coincide with the end of the thread runout on the pipe, in accordance with Figure 7.

Limit deviations of the interference shall not exceed ±.

4.25 The basic dimensions of joints of plain-end high-sealing pipes with trapezoidal thread T and couplings for them are given in Figures 9-12 and Tables 17-20.

Figure 9 - Thread profile shape of trapezoidal thread of plain-end high-sealing pipes T with nominal diameter from 60 to 102 mm (inclusive) and couplings for them, and of all diameters of integral-joint pipes B with external upset ends

Figure 10 - Thread profile shape of trapezoidal thread of plain-end high-sealing pipes with nominal diameter 114 mm and couplings for them

Figure 11 - Dimensions of threaded joints of plain-end high-sealing pipes with trapezoidal thread and couplings for them

Figure 12 - Diagram for determining the interference of trapezoidal thread of plain-end high-sealing pipes and couplings for them

Table 17 - Dimensions of the trapezoidal thread profile of plain-end high-sealing pipes and couplings for them and of integral-joint pipes with external upset ends

In millimetres

	Parameter value
Parameter name	for pipes T with nominal diameter from 60 to 102 mm (inclusive) and couplings for them, and for all diameters of pipes B	for pipes T with nominal diameter 114 mm and couplings for them
Thread pitch	4.233	5.080
Profile height:
external thread	1.20	1.60±0.03
internal thread	1.30
Profile angle *	33°	13°
Angle of inclination of the profile side:
	3°±1°
	30°±1°	10°±1°
Profile rounding radius:
	-	0.20
	0.20
	0.25	-
	-	0.80
	-	0.80
Chamfer width	0.30	-
Width of profile crest:
*	1.659	2.29
*	1.600
Width of profile root:
	1.800	2.43
	1.794
Angle of inclination	2°23’09”	1°47’24”
Taper 2	1:12	1:16
* Dimensions for reference.
Notes
1 Thread pitch is measured parallel to the thread axis of the pipe and coupling.
2 All limit deviations for thread profile elements, except for the limit deviations on the angles of inclination of the sides and the profile height, are given for the design of the thread-forming tool and are not subject to inspection.
3 The profile height of the external thread of integral-joint pipes B is not subject to inspection.

Table 18 - Dimensions of trapezoidal thread connections for pin ends of plain high-tightness pipes

In millimetres

Nominal pipe diameter	Outer diameter	Taper	Internal thread diameter at the basic plane *	External thread diameter at the end face plane *	Diameter of the sealing conical band at the pipe end face plane *	Distance from the end face to the end of thread runout (tolerance plus 3.0 mm)	Distance from the end face to the basic plane *	Distance from the end face to the start of thread	Length of the sealing conical band	Thread runout	Groove depth (tolerance plus 0.25 mm)
								(tolerance minus 1.0 mm)
60	60.3	1:12	57.925	56.575	54.175	65.0	45.0	20.0	10.0	10.0	1.6
73	73.0		70.625	69.275	66.875	65.0	45.0
89	88.9		86.500	84.317	81.917	75.0	55.0
102	101.6		99.200	97.017	94.617	75.0	55.0
114	114.3	1:16	111.100	110.175	106.375	98.0	66.0	29.0	14.0	13.0	2.0
* Dimensions for reference.
Note - The end of the thread runout is taken as the end of the root side of the vanishing thread turn farthest from the pipe end face.

Table 19 - Dimensions of trapezoidal thread connections for couplings of plain high-tightness pipes

In millimetres

Nominal pipe diameter	Taper	Internal thread diameter at the basic plane *	Internal thread diameter at the end face plane *	Diameter of the sealing conical bore at the gauging plane *	Diameter of the chamfer at the end face plane (tolerance plus 1.0 mm)	Internal diameter (tolerance ±0.5)	Distance from the end face to the shoulder (tolerance plus 1.0 mm)	Distance from the end face to the gauging plane *	Length of the threaded taper (tolerance minus 1.0 mm)	Length of thread with full profile	Distance from the end face to the basic plane *	Width of the end face plane
60	1:12	57.925	59.225	54.475	62.5	50.0	63.0	57.0	53.0	43.0	15.6	3.5
73		70.625	71.875	67.125	75.0	60.0					15.0	5.0
89		86.500	87.700	82.117	91.0	74.0	73.0	67.0	63.0	53.0	14.4	6.5
102		99.200	100.350	94.767	104.0	88.0					13.8	6.0
114	1:16	111.100	112.475	106.425	116.5	100.0	96.0	88.0	82.0	72.0	22.0	5.5
* Dimensions for reference.
Note - The end of the thread runout may be located on the chamfer between the thread and the sealing conical bore.

(Amended edition, Amendment No. 1).

Table 20 - Tolerances on nominal dimensions of trapezoidal thread for plain high-tightness pipes and couplings for them, and couplingless pipes with externally upset ends

In millimetres

	Limit deviation
Thread pitch	thread pitch		taper (over a thread length of 100 mm)
	over a thread length of 25.4 mm	over the entire thread length with full profile	external	internal
4.233	±0.04	±0.08	+0.15	-0.15
5.080	±0.05	±0.10
Note - Taper tolerances (deviations of the difference between two diameters) are specified for a thread length of 100 mm and relate to the external diameter of the thread.

4.25.1 The profile dimensions of the trapezoidal thread of pipes T and couplings for them, and couplingless pipes B, are given in Figures 9-10 and Table 17.

The shapes and dimensions of the profile and thread connections of pipes T with a nominal diameter from 60 to 102 mm (inclusive) and couplings for them shall conform to those specified in Figure 9 and Tables 17 and 20, and for pipes with a nominal diameter of 114 mm and couplings for them, to those specified in Figure 10 and Tables 18 and 20.

The chamfer on the crest profile of the thread of pipe T and of the thread of the coupling for it may be replaced by a rounding radius = 0.2 mm.

4.25.2 The connection dimensions shall conform to those specified in Figure 11 and Table 18 for pipes, and in Figure 11 and Table 19 for couplings for them.

At the coupling end face, the chamfer may be replaced by a rounding radius at 35°±5°, provided that the chamfer width is maintained in this replacement.

4.25.3 The minimum wall thickness of the sealing conical band at the pipe end face plane shall be calculated as in 4.23.3, taking as the diameter of the sealing conical band at the pipe end face plane.

If the calculated value is less than 1.8 mm, it is taken as equal to 1.8 mm, except for pipes with diameters of 60 and 73 mm (wall thickness 5.5 mm), for which it is taken as equal to 1.2 and 1.5 mm, respectively.

(Amended edition, Amendment No. 1).

4.25.4 Tolerances on nominal dimensions of the trapezoidal thread of plain high-tightness pipes T and couplings for them, and couplingless pipes B, shall conform to those specified in Table 20.

4.25.5 Tolerances on the pitch of the trapezoidal thread over a length not exceeding 25.4 mm are permitted for the distance between any two full-profile threads.

Over a length between threads exceeding 25.4 mm, an increase in the thread pitch tolerances proportional to the increase in distance is permitted, but not exceeding the values for the entire length of full-profile thread specified in Table 20.

4.25.6 Taper tolerances over the entire length of the sealing conical band of pipes shall not exceed ±0.03 mm, and over the length of the sealing conical bore of couplings for them, plus 0.06 mm.

The taper on the internal thread diameter of couplings for pipes T shall be checked over the length of thread with full profile and truncated crests (up to the start of thread runout).

4.25.7 When determining the thread interference of a pipe, the gauging plane of the ring gauge shall be located at a distance from its end face in accordance with Figure 12:

• for pipes with a nominal diameter from 60 to 102 mm inclusive:

20 mm - when using a threaded ring gauge with a full or incomplete profile,

20 mm - when using a plain ring gauge;

• for pipes with a nominal diameter of 114 mm;

24 mm - both when using a threaded and a plain ring gauge.

4.25.8 When determining the diameter of the sealing conical band of pipes with a nominal diameter from 60 to 102 mm inclusive, the gauging plane of the plain ring gauge shall coincide with the pipe end face or extend beyond the end face by not more than = 1.2 mm, in accordance with Figure 12.

For pipes with a nominal diameter of 114 mm, the gauging plane of the plain ring gauge shall coincide with the pipe end face or fall short of the end face by = 1.6 mm, in accordance with Figure 12.

4.25.9 The thread interference of the coupling for pipes T, measured with a threaded plug gauge, shall be equal to, in accordance with Figure 12:

5.0 mm - for couplings for pipes with a nominal diameter from 60 to 102 mm inclusive;

6.0 mm - for couplings for pipes with a nominal diameter of 114 mm.

The gauging plane of the plain plug gauge, when checking the thread interference of couplings for plain high-tightness pipes T with a nominal diameter from 60 to 102 mm inclusive, shall coincide with the coupling end face or be recessed relative to the coupling end face by not more than, equal to 1.2 mm, in accordance with Figure 12.

When checking the thread interference of couplings for pipes T with a nominal diameter of 114 mm, the gauging plane of the plain plug gauge shall be recessed relative to the coupling end face by a value limited to the range from 6.0 to 8.5 mm, in accordance with Figure 12.

4.25.10 When determining the diameter of the sealing conical bore of the coupling, the gauging plane of the plain plug gauge shall be located from the coupling end face at a distance, in accordance with Figure 12, equal to:

45 mm - for pipes with nominal diameters	60 and 73 mm;
55 mm ” ” ” “	89 and 102 mm;
84 mm ” ” ” “	114 mm.

4.25.11 When hand-tightening a plain high-tightness pipe with a coupling having a phosphate or zinc coating applied to its thread, the interference shall be equal to, in accordance with Figure 12:

4.4 mm - for pipes with a nominal diameter	60 mm;
5.0 mm ” ” ” “	73 mm;
5.6 mm ” ” ” “	89 mm;
6.2 mm ” ” ” “	102 mm;
8.0 mm ” ” ” “	114 mm.

Interference tolerances shall not exceed ±2.0 mm.

4.25.12 After machine tightening of the pipe and coupling, contact between the pipe end face and the coupling shoulder shall be ensured over the entire perimeter of the joint between the abutting surfaces, in accordance with Figure 12.

4.25.13 The pipe end faces and coupling shoulders shall be perpendicular to the thread axis.

Tolerances on perpendicularity and flatness over the width of the abutting surfaces shall not exceed 0.06 mm.

4.25.14 The axes of the thread and of the sealing conical surfaces of pipes and couplings shall coincide.

The tolerance on coaxiality shall not exceed 0.04 mm.

4.26 The main dimensions of thread connections of high-tightness couplingless pipes with externally upset ends and trapezoidal thread are given in Figures 9, 13 and 14 and Tables 17, 20-22.

Figure 13 - Dimensions of threaded connections of high-tightness coupling-free pipes with externally upset ends and trapezoidal thread

Figure 14 - Diagram for determining thread interference of high-tightness coupling-free pipes with externally upset ends and trapezoidal thread

Table 21 - Dimensions of the pin end connection of high-tightness coupling-free pipes with externally upset ends and trapezoidal thread

In millimetres

					Distance from the pin end face to
Nominal pipe diameter	Internal thread diameter at the basic plane *	External diameter of the large base of the thread cone *	External thread diameter at the end face plane *	Diameter of the sealing conical land at the end face plane of the pipe *	thrust shoulder A	start of thread runout	basic plane *
60	62.267	66.0	60.167	57.167	70.0	62.0	54.0
73	75.267	79.0	72.750	69.750
89	91.267	95.0	88.750	85.750	75.0	67.0	59.0
102	104.267	108.0	101.750	98.750
114	117.267	121.0	114.750	111.750
* Dimensions for reference.

Table 22 - Dimensions of the box end connection of high-tightness coupling-free pipes with externally upset ends and trapezoidal thread

In millimetres

	Internal thread diameter				Distance from the end face to
Nominal pipe diameter	at the basic plane *	at the end face plane *	Diameter of the sealing conical bore at the gauging plane *	Diameter of the conical recess at the end face plane *	thrust shoulder G (tolerance minus 0.5)	gauging plane *	Length of the thread cone (tolerance ±0.5)	Length of thread with full profile
60	62.267	63.4	57.30	65.8	70.0	66.0	60.0	50.0
73	75.267	76.5	69.80	78.8
89	91.267	92.4	85.80	94.8	75.0	72.0	65.0	55.0
102	104.267	105.4	98.80	107.8
114	117.267	118.4	111.80	120.8
* Dimensions for reference.
Note - The end of the thread runout for pipes with a nominal diameter of 114 mm may be located on the chamfer between the thread and the sealing conical bore.

4.26.1 The shape and dimensions of the thread profile of the pin and box ends of Pipe B shall comply with those specified in Figure 9 and Tables 17, 20-22.

4.26.2 The dimensions of Pipe B connections shall comply with those specified in Figure 13 and Table 21 for the pin end, and in Figure 13 and Table 22 for the box end, respectively.

4.26.3 Limit deviations from the nominal dimensions of the trapezoidal thread shall comply with those specified in Table 20.

4.26.4 Limit deviations of taper over the entire length of the sealing conical bore of the box end of Pipe B shall not exceed 0.06 mm, and those of the sealing conical land of the pin end of the pipes shall not exceed 0.03 mm.

4.26.5 When determining the thread interference of the pin end of Pipe B, the measuring plane of the plain and threaded ring gauges with full and incomplete profile shall not deviate from the pipe end face by more than 18 mm, in accordance with Figure 14.

4.26.6 When determining the diameter of the sealing conical land of the pin end of Pipe B, the measuring plane of the plain ring gauge shall coincide with the pipe end face or fall short of the end face by not more than 1.2 mm, in accordance with Figure 14.

4.26.7 The thread interference of the box end of Pipe B, as measured with a threaded plug gauge, shall be equal to 5 mm, in accordance with Figure 14.

The measuring plane of the plain plug gauge, when checking the thread interference of the box end of Pipe B, shall coincide with the pipe end face or be recessed relative to its end face by not more than 1.2 mm, in accordance with Figure 14.

4.26.8 When determining the diameter of the sealing conical bore of the box end of Pipe B, the measuring plane of the plain plug gauge shall be located from its end face at a distance equal to 54.0 mm for pipes with a nominal diameter of 60 mm, and 59.0 mm for pipes with a diameter greater than 60 mm, in accordance with Figure 14.

The limit deviation of the diameter of the sealing conical bore shall not exceed plus 1.2 mm.

4.26.9 When determining the diameter of the conical recess of the box end of Pipe B, the measuring plane of the plain plug gauge shall coincide with the pipe end face or fall short of the end face by not more than 1.2 mm, in accordance with Figure 14.

4.26.10 The thrust surfaces A, B, V and G of Pipe B shall be perpendicular to the thread axis.

The limit deviation from perpendicularity and from flatness over the width of the pipe thrust surfaces shall not exceed 0.06 mm each.

4.26.11 The axes of the thread and of the sealing conical surfaces of the pin and box ends of the pipe shall coincide.

The tolerance on coaxiality shall not exceed 0.04 mm.

4.26.12 The surface of the plain part of the thread cone of the pin end of Pipe B, located beyond the thread runout, shall be a continuation of the surface formed by the crests of the thread profile.

4.26.13 The wall thickness variation at the end face plane V (of the pin end) and B (of the box end) shall not exceed 1.0 mm.

4.26.14 The width of the thrust surfaces A (of the pin end) and G (of the box end) shall be not less than that specified in Table 23.

Table 23 - Minimum width of the thrust surfaces of the pin end A and the box end G of high-tightness coupling-free pipes with externally upset ends and trapezoidal thread

In millimetres

Nominal pipe diameter	Nominal wall thickness	Minimum width of thrust surfaces
		A	G
60	5.0	1.75	2.00
73	5.5	1.75	2.25
	7.0	2.75	3.50
89	6.5	2.75	3.25
	8.0	3.75	4.50
102	6.5	3.25	3.50
114	7.0	3.75	4.00

4.27 The thread surfaces of tubing, the sealing conical surfaces, thrust end faces and shoulders of Pipe T and couplings for them, as well as the conical recess of coupling-free (box-end) Pipe B, shall be smooth, free of burrs, tears, and other defects that impair their continuity and strength.

The surface roughness parameter of the thread shall not exceed 20 µm.

4.28 The thread axes of both ends of an individual coupling shall coincide.

Limit deviations from coaxiality, mm, not more than:

at the coupling end face plane - 0.75;

over a length of 1.0 m - 3.0.

4.29 Threads with black scale on the thread crests are not permitted at a distance of less than (1-) mm from the pipe end face.

The value is set equal to:

7.5 mm - for thread with a pitch of	2.54 mm;
8.5 mm ” ” ” “	4.233 mm;
10.0 mm ” ” ” “	3.175 and 5.080 mm.

4.30 The maximum difference in thread diameters of couplings of all pipes and box ends of Pipe B in a single cross-section (ovality) shall not exceed:

0.10 mm - for couplings and box ends of pipes with a nominal diameter from 27 to 60 mm inclusive;

0.13 mm - with a nominal diameter of 73 and 89 mm inclusive;

0.15 mm - with a nominal diameter of 102 and 114 mm.

4.31 Each pipe and coupling (coupling blank) shall be subjected to non-destructive testing for the presence of longitudinal defects on the outer and inner surfaces.

Non-destructive testing of couplings may be carried out without testing the coupling blanks.

The weld joint of each electrically welded pipe shall be subjected to non-destructive testing for the presence of longitudinal defects on the outer and inner surfaces.

The upset ends of pipes shall be subjected to non-destructive testing for the presence of longitudinal and transverse defects on the outer and inner surfaces.

(Amended edition, Amendment No. 1).

5 Marking

5.1 The marking of pipes shall comply with GOST 10692 with additions.

5.2 On each pipe, at a distance of 300-700 mm from its coupling or box (for Pipe B) end, clear marking shall be applied by stamping, using a font not smaller than 6-Pr3 or 8-Pr3 per GOST 26.008.

The marking is applied by impact stamping or roll stamping along the generatrix, in one or more rows, in the following sequence:

• letter P - only for Pipe G and Pipe V with a sealing ring made of polymer materials installed in the coupling;

• nominal diameter of the pipe, mm - up to three digits;

• nominal wall thickness (a whole number, or for pipes with a fractional wall thickness - numbers without a comma separating the integer and decimal parts), mm - up to three digits;

• strength group (with the index “s” for electrically welded pipes, for example - letter and index (for electrically welded pipes only);

• batch number - up to five digits;

• trademark of the manufacturing enterprise - a symbol or up to five letters;

• month and year of manufacture (last two digits) - up to four digits.

5.3 The location of marking applied by impact stamping or roll stamping shall be highlighted (outlined or underlined) with a durable light-colored paint.

5.4 On each pipe, beyond the location of the marking applied by impact stamping or roll stamping, marking shall be applied with durable light-colored paint, in the following sequence:

• letter P - only for Pipe G and Pipe V with a sealing ring made of polymer materials installed in the coupling;

• designation of the pipe;

• nominal diameter of the pipe, mm;

• nominal wall thickness in whole numbers or numbers without a comma separating the integer and decimal parts of the number (for pipes with a fractional wall thickness), mm;

• strength group;

• pipe length, cm;

• trademark of the manufacturer;

• pipe mass, kg;

• designation of this standard.

Marking may be applied on a white background using dark paints (black, violet or other contrasting colour).

5.5 The height of the marking characters is selected depending on the pipe diameter, but shall not exceed 50 mm.

For pipes with nominal diameters from 27 to 60 mm inclusive, paint marking of each pipe may be replaced by marking applied by stamping or rolling onto a metal tag securely attached to each bundle. In this case, the marking shall indicate the total length and total mass of the pipes contained in the bundle.

5.6 Each coupling shall be clearly marked by stamping or rolling with the manufacturer’s trademark and strength group.

Couplings with a sealing ring (or a groove for it) shall be additionally marked with the letter P before the trademark.

5.7 All marking characters shall be applied along the generating line of the pipe or coupling.

When marking is applied by rolling, the marking characters may be positioned perpendicular to the generating line.

5.8 By agreement between the customer and the manufacturer, additional information may be included in the marking, with a corresponding entry made in the accompanying quality documents for the supplied pipes.

6 Packaging

6.1 Pipe packaging shall comply with GOST 10692, with additions.

6.2 The thread surface, thrust ends and shoulders, and sealing conical surfaces of pipes and couplings shall be protected by protective parts (rings and nipples) against mechanical damage during loading and unloading and transportation.

The design and material of the protective parts shall prevent dust and moisture from reaching the protected surfaces during transportation and during the normal storage period. The thread form of the protective parts shall prevent damage to the thread of the products. The material of the protective parts shall not contain components capable of causing corrosion or causing the protective parts to adhere to the thread.

(Amended edition, Amendment No. 1).

6.3 The design of the protective parts shall allow for their repeated use by the customer.

6.4 Before screwing the protective parts onto the pipe, the sealing conical surfaces, the thrust ends of pipes and bell ends, the thrust shoulders of couplings, and the threads of pipes and couplings shall be coated with anti-corrosion grease.

A thread compound agreed with the customer may be used for this purpose.

6.5 The protective part shall cover the thread of the pipe nipple end for a length of not less than minus 3 threads, and the thread of the coupling and/or the bell end of coupling-less pipes for a length of not less than the length .

All protective parts shall extend beyond the edges of the ends of pipes and couplings by not less than 10.0 mm.

6.6 Pipes shall be supplied in bundles securely strapped in accordance with GOST 10692 at not less than three points.

When strapping pipes into bundles, the couplings on the pipes and the bell ends of coupling-less pipes shall be oriented in the same direction.

The mass of a pipe bundle shall not exceed 5 t, or 3 t at the customer’s request.

By agreement between the manufacturer and the customer, pipes may be supplied in bundles weighing more than 5 t.

6.7 Only pipes from a single lot shall be loaded into one railcar.

Shipment of pipes from different lots in one railcar is allowed, provided their bundles are separated.

7 Acceptance rules

7.1 The manufacturer shall perform acceptance inspection of pipes and couplings, and their acceptance tests and periodic tests, to verify compliance with the requirements of this standard.

When couplings are supplied separately from pipes, each coupling shall undergo acceptance inspection, and the lot of couplings shall undergo acceptance tests.

7.2 Acceptance inspection shall be performed on:

• each pipe - for compliance with the requirements set out in 3.3; 3.5-3.8; 4.2-4.5; 4.13-4.16; 4.18; 4.19; 4.21; 4.23.10; 4.23.12; 4.24.1-4.24.3; 4.25-4.31; and Sections 5 and 6;

• each coupling - for compliance with the requirements set out in 3.3; 3.5; 3.7; 4.2; 4.18; 4.19; 4.23.5; 4.23.6; 4.23.9; 4.23.11; 4.23.12; 4.24.1-4.24.3; 4.24.6; 4.24.8; 4.24.9; 4.25.1; 4.25.2; 4.25.4-4.25.6; 4.25.9-4.25.14; 4.29-4.31; and in Sections 5 and 6.

7.3 Pipes and couplings that have passed acceptance inspection and have been assembled into lots shall undergo acceptance tests for compliance with requirements 4.6; 4.8; 4.9; 4.22; 4.27 - for pipes, and requirements 4.7-4.9; 4.18; 4.27; 4.28 - for couplings.

7.4 Pipes shall be submitted for acceptance in lots.

The lot size of pipes shall not exceed 60 t or 500 pcs. (whichever is less).

By agreement between the manufacturer and the customer, the lot size may be increased.

A lot shall consist of pipes or couplings of the same type, the same nominal diameter, the same wall thickness and strength group, and shall be accompanied by a quality document confirming their compliance with the requirements of this standard and containing:

• name of the manufacturer;

• nominal outer diameter of pipes, mm;

• nominal wall thickness, mm;

• strength group (for electric-welded pipes, the index “c” is added to the strength group designation);

• type of threaded connection;

• a note on the presence of sealing rings made of non-metallic materials in the coupling (only for couplings for pipes with triangular thread);

• total length of pipes, m;

• total mass of pipes, kg;

• heat number;

• lot number (from … to … for each heat);

• number of pipes in the lot;

• mass fraction of sulfur and phosphorus for all heats included in the lot;

• test results (for pipes or couplings accepted with determination of impact toughness at reduced temperatures, the test temperature shall be indicated);

• designation of this standard.

7.5 Each pipe and each coupling in the lot shall be checked for compliance with the requirements of this standard, with defect measurements performed if necessary.

7.5.1 Not less than 1% of the couplings in each lot shall be checked for thread coaxiality.

7.5.2 Checking the interference of hand-tightened pipes and couplings shall be performed only when fulfilling a customer order for the supply of pipes with an unsecured coupling.

7.5.3 Checking the internal diameter and overall curvature of type B pipes may be performed before upsetting the ends.

7.5.4 Checking the quality of the mating between the end of a type T pipe and the thrust shoulder of its coupling shall be performed at each joint of these pipes.

7.6 Mass shall be checked on each pipe.

By agreement with the customer, the manufacturer may omit this check, in which case pipes are accepted based on calculated mass.

Couplings are accepted based on calculated mass.

7.7 The mass fraction of sulfur and phosphorus shall be checked in a sample from each heat.

For pipes made from purchased metal, the mass fraction of sulfur and phosphorus is confirmed by the quality document of the metal manufacturer.

7.8 One pipe and one coupling (coupling blank) from each lot shall be checked for the mechanical properties of the pipe and coupling metal.

(Amended edition, Amendment No. 1).

7.9 Testing of the welded joint for hardness, tensile strength and impact toughness shall be performed on specimens from a randomly selected pipe from the lot.

7.10 One electric-welded pipe from each lot shall be subjected to a flattening test.

When the pipe electric-welding mill is started up after each stoppage, not less than the first two finished pipes shall be subjected to the flattening test.

7.11 Each pipe shall be subjected to an internal hydraulic pressure test.

Testing of type B pipes may be performed after heat treatment, before thread cutting.

7.12 Each pipe and coupling blank shall be subjected to non-destructive testing.

7.13 If unsatisfactory results are obtained in acceptance tests for at least one parameter, repeat tests for that parameter shall be performed on double the number of pipes taken from the same lot.

The results of the repeat tests apply to the entire lot, except for the pipes with unsatisfactory test results.

7.14 Periodic tests shall be performed on pipes and couplings that have passed acceptance tests.

Tests shall be performed by organizations holding appropriate licenses, not less than once every three years or whenever the pipe manufacturing technology changes, according to programs and procedures approved in the established manner.

During periodic tests, the following shall be checked:

• thread pitch (over a length of 25.4 mm and over the entire length of the full-profile thread);

• flank angles of the thread profile, taper over the pitch diameter of the thread of pipes and their couplings;

• taper over the minor diameter of the thread of type T pipes and the nipple ends of type B pipes, and over the major diameter of the thread of couplings for type T pipes and the bell ends of type B pipes;

• thread profile height of pipes and couplings;

• perpendicularity and flatness of the thrust surfaces, coaxiality of the thread and sealing conical surfaces of the joints of type T pipes and their couplings and of type B pipes, width of the thrust surfaces A (nipple end) and G (bell end) of type B pipes;

• other linear and angular thread dimensions of pipes and couplings specified in Section 4 of this standard.

8 Test methods

8.1 The outer and inner surfaces of pipes, marking and packaging shall be checked visually.

When checking the inner surface of pipes, light sources with a power of not less than 60 W shall be used, placed alternately at the end of the nipple or the coupling screwed onto the pipe, on the side opposite the location of the inspector (controller, operator).

8.2 The depth of defects shall be checked after notching in one to three places with a depth gauge (GOST 7661), an indicator (GOST 577), a wall thickness gauge (GOST 11358) and other linear measuring instruments ensuring compliance with the requirements of this standard.

8.3 The dimensions of pipes and couplings shall be checked using universal measuring instruments or special devices.

8.3.1 The length of the pipe shall be checked with a tape measure (GOST 7502) or other linear measuring instruments ensuring compliance with the requirements of this standard.

8.3.2 The bore diameter and overall curvature of the pipe shall be checked along its entire length with a cylindrical mandrel 1250 mm long and an outer diameter as specified in Table 24.

Table 24 - Outer diameters of cylindrical mandrels for checking the internal diameters and overall curvature of pipes

In millimetres

		Pipe
Nominal pipe diameter	Nominal pipe wall thickness	B, G, N (except bell-ended), T		B, N (bell-ended only)
		Pipe bore diameter	Outer diameter of cylindrical mandrel	Bore diameter (at the end of the upset part) of the pipe	Outer diameter of cylindrical mandrel
27	3.0	20.7	18.3	-	-
	4.0	18.7	16.3
33	3.5	26.4	24.0
	4.5	24.4	22.0
42	3.5	35.2	32.8
	5.0	32.2	29.8
48	4.0	40.3	37.9
	5.0	38.3	35.9
	6.5	35.3	32.9
	8.0	32.3	29.9
60	5.0	50.3	47.9	48.3	46.3
	6.5	47.3	44.9	-	-
	7.5	45.3	42.9
	8.5	43.3	40.9
73	5.5	62.0	59.6	60.0	58.0
	7.0	59.0	56.6	59.0	57.0
	8.0	57.0	54.6	-	-
	9.0	55.0	52.6
	10.0	53.0	50.6
	11.5	50.0	47.6
89	6.0	76.9	73.7	-	-
	6.5	75.9	72.7	73.9	71.9
	7.5	73.9	70.7	-	-
	8.0	72.9	69.7	70.9	68.9
	9.5	69.9	66.7	-	-
	11.0	66.9	63.7
	12.0	64.9	61.7
	13.5	61.9	58.7
102	6.0	89.6	86.4
	6.5	88.6	85.4	86.6	84.6
	8.5	84.6	81.4	-	-
	10.5	80.6	77.4
	13.0	75.6	72.4
	15.5	70.6	67.4
114	7.0	100.3	97.1	98.3	96.3
	8.5	97.3	94.1	-	-
	10.0	94.3	91.1
	11.0	92.3	89.1
	13.0	88.3	85.1
	14.5	85.3	82.1
	16.0	82.3	79.1
Note - The outer diameter of the cylindrical mandrel is calculated:
- for pipes B, G, N (except bell-ended) and T:
for nominal diameters from 27 to 89 mm, by the formula				;		(5)
for nominal diameters of 89 mm and above, by the formula				,		(6)
where is the internal diameter of the pipe as specified in Tables 2-4;
- for pipes B of all diameters and bell-ended pipes N, by the formula				,			(7)
where is the internal diameter at the end of the upset part of the pipe.

By agreement between the manufacturer and the consumer, pipes B, G, N and T with a nominal diameter of 60 mm and a wall thickness of 5.0 mm may be checked with mandrels of an increased diameter equal to 49.0 mm, and pipes with a nominal diameter of 73 mm and a wall thickness of 5.5 mm - with mandrels of an increased diameter equal to 60.5 mm.

The permissible deviation of the outer diameter of cylindrical mandrels must not exceed plus 0.25 mm.

8.3.3 Curvature at the end sections of the pipe shall be checked with a 1000 mm straightedge of type ShD-2 (GOST 8026) and a vernier depth gauge (GOST 162) or other measuring instruments ensuring the necessary measurement accuracy.

For measurement, the section of the pipe with the maximum curvature is visually selected.

The overall curvature of pipes with a diameter of 114 mm shall be checked at the middle of the pipe with a taut string (fishing line) applied to the outer surface of the pipe on the concave side, with measurements taken using a ruler (GOST 427).

When measuring curvature, the length of the upset part of the pipe is not taken into account.

Other measuring instruments ensuring compliance with the requirements of this standard may be used for checking.

(Amended edition, Amendment No. 1).

8.4 Checking of the thread dimensions of pipes and couplings shall be carried out using universal measuring instruments or special devices.

8.4.1 Thread taper is checked with gauges and feeler gauges or special instruments.

The taper of the outer thread diameter of pipes B and G and of the inner thread diameter of couplings shall be checked with a smooth taper gauge in accordance with GOST 10654 or special instruments.

The taper of the outer thread diameter of pipes B and T and nipple ends of pipes B, bell ends of pipes B and couplings of pipes T, as well as the taper of the sealing conical surfaces of pipes T and couplings for them and pipes B, shall be checked with a smooth taper gauge in accordance with GOST 25576 or special instruments.

Taper is determined as the quotient of dividing the difference between the diameters (outer, mean or internal) of any two threads by the length of the thread (measured parallel to its axis) between these threads.

When checking thread taper using a smooth gauge to measure its value, a feeler gauge up to 7.0 mm wide (inclusive) shall generally be used, with subsequent recalculation of the obtained value taking into account the length of the ring gauge or plug gauge (excluding the width of the relief groove).

When using a feeler gauge wider than 7.0 mm to measure taper, a correction determined as follows shall be added to the obtained values,

, (8)

where is the mean (for pipes B and G) or internal (for pipes B and T) thread diameter in the basic plane, mm;

• feeler gauge width, mm.

The diameters of the spherical tips of special instruments must comply with those specified in Table 24a.

Table 24a - Diameters of spherical tips of special instruments

In millimetres

Thread type	Thread pitch	Diameter of spherical tip
Triangular	2.540	1.45
	3.175	1.83
Trapezoidal	4.233	1.45

(Amended edition, Amendment No. 1).

8.4.2 Checking of the interference (makeup) of threaded joints of each pipe and each coupling shall be carried out with gauges for triangular (GOST 10654) or trapezoidal (GOST 25576) threads or special instruments.

It is permitted to check the makeup of coupling threads before applying a phosphate or zinc coating to it.

Before checking, the gauge is thoroughly cleaned with a bristle brush, and its working surface is lubricated with a thin layer of mineral (e.g. per GOST 32) or industrial (e.g. per GOST 20799) oil.

The gauge must have the same temperature as the item being checked.

Makeup is determined as the distance between the measuring plane of the gauge and the end face of the pipe or coupling, and it must comply with the requirements of this standard.

Measurement of makeup shall be carried out with a caliper (GOST 166) or a vernier depth gauge (GOST 162) using gauges.

The makeup of the triangular thread of pipes B and G and couplings for them shall be checked with threaded ring gauges and plug gauges in accordance with GOST 10654.

The makeup of the thread of pipes T and nipple ends of pipes B shall be checked with smooth and threaded ring gauges, and the diameter of the sealing conical land - with smooth ring gauges in accordance with GOST 25576.

The makeup of the thread of couplings for pipes T and bell ends of pipes B shall be checked with smooth and threaded plug gauges, and the diameters of the sealing conical bore and the conical recess - with smooth plug gauges in accordance with GOST 25576.

Note - In case of disagreement between the consumer and the manufacturer regarding the actual value of makeup, the measurement taken after complete removal of the thread coating by chemical or anodic dissolution methods shall be considered final.

8.4.3 Checking of the makeup when screwing the coupling onto the pipe by hand shall be carried out by measurement with a caliper (GOST 166).

When checking on a special test bench or lathe, the coupling shall be screwed onto a cylindrical rod precisely aligned and centered in the chuck of the lathe or special fixture.

On each cylindrical rod, when manufactured on one machine and in one setup, the thread cutting and turning of its outer diameter must be performed.

A different cylindrical rod, manufactured in the same manner, cleanly finished and at least 250 mm long, must be screwed into the free end of the coupling.

By rotating the coupling using an indicator clamped in a stand or tripod, the runout (twice the value of the deviation from coaxiality) of the rod at the end face of the coupling and at the end of the rod is determined.

The runout at the end of the rod is read from the middle of the coupling.

(Amended edition, Amendment No. 1).

8.4.5 The height (depth) of the thread profile shall be measured with a special dial depth gauge (GOST 7661).

The tip of the indicator’s measuring rod must correspond to the thread type.

Setting of the dial depth gauge before taking measurements is carried out against a reference standard or a flat lapped surface with a finish class of not lower than 20.

It is permitted to check the thread profile using other means and methods ensuring compliance with the requirements of this standard.

8.4.6 The thread length shall be checked with a caliper (GOST 166) or a ruler (GOST 427) by direct measurement from the end face of the pipe to the end of the thread runout (for pipes) or from the beginning of the thread to the middle (to the point where the threads are cut through) of the coupling.

8.4.7 The wall thickness under the thread shall be checked with a wall thickness gauge (GOST 11358) or a micrometer (GOST 6507) in the root of the first thread located on the side of the pipe end face.

The movable measuring tip of the wall thickness gauge or micrometer must have a shape that allows these measurements of the corresponding thread to be taken.

8.4.8 Checking of the mating of the end face of pipe T with the shoulder stop of the coupling for it shall be carried out with a flat feeler gauge no more than 0.03 mm thick, with the feeler gauge not passing through along the entire perimeter of the joint.

8.5 Determination of pipe mass shall be carried out on special weighing equipment (e.g. per GOST 29329) according to the pipe manufacturer’s procedure.

8.6 The content of sulfur and phosphorus in steels shall be determined according to GOST 12345 and GOST 12347 respectively.

Samples shall be taken in accordance with the requirements of GOST 7565.

8.7 Checking of the mechanical properties of the metal shall be carried out on specimens cut from a randomly selected pipe by a method that does not cause changes in the structure and mechanical properties of the metal, in accordance with GOST 30432.

For all pipes with upset ends, specimens shall be cut from the upset part.

Straightening the ends of the specimen for gripping by the testing machine’s clamps is permitted.

(Amended edition, Amendment No. 1).

8.7.1 Tensile testing shall be carried out in accordance with GOST 10006 on short longitudinal specimens.

For testing, one specimen is taken from a randomly selected pipe or coupling blank (coupling) from the batch.

8.7.2 Hardness testing of the metal of the pipe or coupling (coupling blank) and the welded joint is carried out in accordance with GOST 9012 on the outer or inner surface, or on three specimens from the body of the pipe or coupling (coupling blank) and the welded joint.

Hardness testing of products with a wall thickness of less than 7.0 mm shall be performed using fixtures that prevent their deflection.

(Amended edition, Amendment No. 1).

8.7.3 The flattening test of electric-welded pipes shall be performed in accordance with GOST 8695 on ring specimens 60 mm wide, cut from both ends of the finished pipes (or, for pipes, before thread cutting).

In the specimens, the weld seam shall be located in the zone of maximum bending (3 or 9 o’clock position).

Specimens may have a chamfer of no more than 1×45°.

The distance between the plates at the moment fracture indications appear in the specimen (crack, break, delamination) shall not exceed the values obtained by calculation using the formulas given in Table 9.

8.7.4 The impact bending test shall be performed in accordance with GOST 9454-78. The specimen sampling scheme for the impact bending test is shown in Figure 15.

(Added, Amendment No. 1).

Figure 15 - Sampling scheme for specimens for impact bending testing of pipe and coupling material

8.8 The internal hydraulic pressure test shall be performed according to the manufacturer’s procedure.

The duration of the test for each pipe shall be at least 10 s.

Pipes in which leakage of the test liquid is detected at the joint shall be subject to rethreading, fitting (if necessary) of a new coupling, and subsequent repeat hydraulic testing.

Pipes in which leakage of the test liquid is detected in the body or weld seam shall be rejected.

8.9 Non-destructive flaw detection testing of pipes, couplings and coupling blanks shall be performed using the following methods:

• pipe body and coupling blanks - automatic ultrasonic or magnetic methods;

• couplings - wet magnetic particle method;

• weld joint of electric-welded pipes - automatic ultrasonic or magnetic methods;

• upset ends of seamless pipes - magnetic particle method;

• unthreaded pipe ends not covered by automatic testing - ultrasonic or wet magnetic particle methods;

• threaded pipe ends not covered by automatic testing - wet magnetic particle method.

By agreement between the manufacturer and the consumer, other non-destructive testing methods with equal or greater sensitivity may be used.

Non-destructive testing of pipes and coupling blanks shall be performed after final heat treatment and straightening; testing of couplings - after final heat and mechanical treatment; testing of upset ends - before trimming the pipe ends.

Non-destructive testing of pipes, couplings and coupling blanks shall be performed in accordance with the manufacturer’s regulatory documentation.

Before testing pipes and coupling blanks, the sensitivity of the equipment shall be adjusted using reference standards (RS) made from the smooth section of the pipe or coupling blank of the type and size being tested and containing artificial defects, the locations and recommended dimensions of which are given in Tables 25 and 26. Defects whose signal exceeds the signal from the artificial defect are considered critical.

Magnetic particle testing of the upset ends of pipes for longitudinal and transverse defects shall be performed on the outer and inner surfaces at a distance of at least 150 mm from the ends.

Removal (repair) of defects detected during non-destructive testing is permitted, provided that the minimum wall thickness requirements are met and the cleaned area is subjected to non-destructive testing using the same equipment, the same method, and the same sensitivity as the initial testing.

Repair by welding is not permitted.

Pipes, coupling blanks and couplings that fail non-destructive testing shall be rejected.

Table 25 - Recommended dimensions of artificial defects of the reference standard (RS) for adjusting the sensitivity of non-destructive testing equipment for the body of pipes and coupling blanks

In millimetres

Applications	Ultrasonic or magnetic non-destructive testing methods
	Type, location and dimensions of the artificial defect
	Rectangular-profile notch, parallel or perpendicular to the RS axis						Through drilled hole, perpendicular to the RS axis
	on the outer surface			on the inner surface
	Depth	Width	Length	Depth	Width	Length	Diameter
For all strength groups	(10.0±1.5)% of , but not less than 0.30±0.05	Not more than 1.0	Not more than 50.0	(10.0±1.5)% of , but not less than 0.30±0.05	Not more than 1.0	Not more than 50.0	1.6±0.1
By agreement between the manufacturer and the consumer - for strength groups , , , , ,	(12.5±2.0)% of , but not less than 0.30±0.05						3.2±0.1
Note - - nominal wall thickness of the pipe or coupling blank.

Table 26 - Recommended dimensions of artificial defects of the reference standard (RS) for adjusting the sensitivity of non-destructive testing equipment for the weld seam of electric-welded pipes

In millimetres

Strength group	Ultrasonic or magnetic non-destructive testing methods
	Type, location and dimensions of the artificial defect
	Rectangular-profile notch along the weld seam						Through drilled hole, perpendicular to the RS axis
	on the outer surface			on the inner surface
	Depth	Width	Length	Depth	Width	Length	Diameter
For all strength groups except	(10.0±1.5)% of , but not less than 0.30±0.05	Not more than 1.0	Not more than 50.0	(10.0±1.5)% of , but not less than 0.30±0.05	Not more than 1.0	Not more than 50.0	3.2±0.1
For strength group	(5.0±1.0)% of , but not less than 0.30±0.05			(5.0±0.8)% of , but not less than 0.30±0.05			1.6±0.1
Note - - nominal wall thickness of the pipe or coupling blank.

(Amended edition, Amendment No. 1).

8.10 The test results apply to all pipes and couplings in the batch being tested.

If negative test results are obtained for at least one of the parameters, repeat tests shall be performed for that parameter on double the number of specimens. If the results obtained in this case still fail to meet the requirements of this standard, all pipes in the batch shall be rejected.

The manufacturer has the right to reprocess the entire batch of rejected pipes in accordance with its adopted technology and retest these products.

8.11 Safety requirements in accordance with GOST 12.2.003 shall be observed when conducting tests.

8.12 Workplace conditions shall comply with the requirements of GOST 12.1.005 and GOST 12.2.061.

9 Transportation and storage

9.1 Conditions for transportation and storage of pipes shall comply with GOST 10692, with the following additions.

9.1.1 When transporting pipes by rail, a single railcar shall contain only pipes of one upset type, one nominal diameter, and one strength group.

Shipping pipes of different sizes in one railcar is permitted provided the bundles are kept separate.

9.1.2 When transporting pipes by other modes of transport, shipping conditions are determined by the agreement (contract) between the manufacturer and the recipient (consumer) of the pipes.

9.2 Transportation of pipes with regard to the effects of environmental climatic factors shall comply with storage condition group 8 of GOST 15150.

9.3 Storage conditions - in accordance with GOST 15150, group 7.

10 Operating instructions

10.1 Pipes manufactured in accordance with this standard may be used in all climatic regions in accordance with GOST 16350.

Operating conditions - in accordance with GOST 15150, group 5.

10.2 The applications of pipes manufactured in accordance with this standard are limited to environments with the parameters given in Table 27.

Table 27 - Applications of pipes and their couplings in hydrogen-sulphide-containing environments depending on gas factor, absolute pressure (), partial pressure of hydrogen sulphide () and its concentration ()

Applications of pipes for multiphase “oil-gas-water” fluid with a gas factor of less than 890 Nm/m			Applications of pipes for wet gas or water-cut oil with a gas factor of 890 Nm/m or more
1.83 MPa (18.6 kgf/cm)		>1.83 MPa (18.6 kgf/cm), 0.02% (by volume) and 0.000345 MPa	0.450 MPa (4.6 kgf/cm), 10% (by volume)	>0.450 MPa (4.6 kgf/cm), 0.075% (by volume) and 0.000345 MPa
4% (by volume)	4%<15% 0.073 MPa
Note - The partial pressure of hydrogen sulphide () is calculated as the product of its concentration () and the absolute pressure ().

10.3 Other requirements for the operation, repair and design calculation of tubing shall be established by regulatory documents.

11 Manufacturer’s warranty

11.1 The manufacturer shall guarantee that tubing complies with the requirements of this standard, provided the transportation, storage and operating conditions are observed.

11.2 The warranty period for the consumer to file quality claims regarding pipes and couplings shall be at least 12 months from the date the pipes are put into operation, and 18 months from the date of manufacture.

12 Consumer inspection

12.1 The consumer has the right to inspect the quality and conformity of tubing with the requirements of this standard during its production.

12.2 The conditions for the consumer’s inspection of pipes shall be defined by the supply agreement (contract). The manufacturer shall provide the consumer’s representative with access to the manufacturer’s facilities during the performance of work under the contract.

APPENDIX A (mandatory). Examples of designations for tubing and couplings

Table A.1

Designation	Symbol
Tubing
Non-threaded N, seamless, with plain ends, nominal diameter 60 mm, wall thickness 5.0 mm, made of steel strength group , length group I	N-60×5-D-I GOST R 52203-2004
Same, length group II	N-60×5-D-II GOST R 52203-2004
Same, with externally upset ends	NV-60×5-D-II GOST R 52203-2004
Non-threaded N, electric-welded straight-seam, with plain ends, nominal diameter 73 mm, wall thickness 5.5 mm, made of steel strength group , length group I	N-73×5.5-D-I GOST R 52203-2004
Same, length group II	N-73×5.5-D-II GOST R 52203-2004
Non-threaded N, electric-welded straight-seam, with externally upset ends, nominal diameter 73 mm, wall thickness 5.5 mm, made of steel strength group , length group I	NV-73×5.5-D-I GOST R 52203-2004
Same, length group II	NV-73×5.5-D-II GOST R 52203-2004
With plain ends G, with triangular thread, seamless, nominal diameter 60 mm, wall thickness 5.0 mm, made of steel strength group , length group I	G-60×5-D-I GOST R 52203-2004
Same, length group II	G-60×5-D-II GOST R 52203-2004
Same, with a sealing ring made of polymer materials in the coupling	PG-60×5-D-II GOST R 52203-2004
With plain ends G, with triangular thread, electric-welded straight-seam, nominal diameter 73 mm, wall thickness 5.5 mm, made of steel strength group , length group I	G-73×5.5-D-I GOST R 52203-2004
With plain ends G, with triangular thread, seamless, nominal diameter 60 mm, wall thickness 5.0 mm, made of steel strength group accepted with determination of impact toughness at low temperatures, length group II	G-60×5-DKh-II GOST R 52203-2004
With externally upset ends V, with triangular thread, seamless, nominal diameter 60 mm, wall thickness 5.0 mm, made of steel strength group , length group I	V-60×5-E-I GOST R 52203-2004
With externally upset ends V, with triangular thread, electric-welded straight-seam, nominal diameter 60 mm, wall thickness 5.0 mm, made of steel strength group , length group II	V-60×5-E-II GOST R 52203-2004
Same, with a sealing ring made of polymer materials in the coupling	PV-60×5-E-II GOST R 52203-2004
Tubing
Plain high-sealing, with trapezoidal thread T and coupling, seamless, nominal diameter 60 mm, wall thickness 5.0 mm, made of steel strength group , length group II	T-60×5-E-II GOST R 52203-2004
Plain high-sealing, with trapezoidal thread T and coupling, electric-welded straight-seam, nominal diameter 60 mm, wall thickness 5.0 mm, made of steel strength group , length group I	T-60×5-E-I GOST R 52203-2004
High-sealing, couplingless B, with trapezoidal thread, seamless, nominal diameter 60 mm, wall thickness 5.0 mm, made of steel strength group , length group II	B-60×5-E-II GOST R 52203-2004
High-sealing, couplingless B, with trapezoidal thread, seamless, nominal diameter 60 mm, wall thickness 5.0 mm, made of steel strength group accepted with determination of impact toughness value at low temperatures, length group II	B-60×5-EKh-II GOST R 52203-2004
Coupling for pump-compressor tubing
Strength group , with triangular thread, for seamless (hot-rolled) or straight-seam (electric-welded) pipe with plain ends G, nominal diameter 73 mm, made of steel strength group or (for electric-welded)	G 73-D GOST R 52203-2004
Strength group , with triangular thread, for seamless (hot-rolled) or straight-seam (electric-welded) pipe with plain ends G, nominal diameter 60 mm, made of steel strength group or (for electric-welded), accepted with determination of impact toughness at low temperatures	G 60-DKh GOST R 52203-2004
Strength group , with triangular thread, for seamless (hot-rolled) or straight-seam (electric-welded) pipe with externally upset ends V, nominal diameter 73 mm, made of steel strength group or (for electric-welded)	V 73-D GOST R 52203-2004
Strength group , with triangular thread, for seamless (hot-rolled) or straight-seam (electric-welded) pipe with externally upset ends V, nominal diameter 60 mm, made of steel strength group or (for electric-welded), accepted with determination of impact toughness at low temperatures	V 60-DKh GOST R 52203-2004
Strength group , with triangular thread and a groove for installing sealing rings made of polymer materials, for seamless or straight-seam (electric-welded) pipe with plain ends G, nominal diameter 73 mm, made of steel strength group or (for electric-welded)	PG 73-D GOST R 52203-2004
Strength group , with triangular thread and a groove for installing sealing rings made of polymer materials, for seamless or straight-seam (electric-welded) pipe with plain ends G, nominal diameter 60 mm, made of steel strength group or (for electric-welded), accepted with determination of impact toughness at low temperatures	PG 60-DKh GOST R 52203-2004
Coupling for pump-compressor tubing
Strength group , with triangular thread and a groove for installing sealing rings made of polymer materials, for seamless or straight-seam (electric-welded) pipe with externally upset ends V, nominal diameter 73 mm, made of steel strength group or (for electric-welded)	PV 73-D GOST R 52203-2004
Strength group , with triangular thread and a groove for installing sealing rings made of polymer materials, for seamless or straight-seam (electric-welded) pipe with externally upset ends V, nominal diameter 60 mm, made of steel strength group or (for electric-welded), accepted with determination of impact toughness at low temperatures	PV 60-DKh GOST R 52203-2004
Strength group , with trapezoidal thread, for plain high-sealing pipe T, nominal diameter 60 mm, made of steel strength group	T 60-E GOST R 52203-2004
Strength group , with trapezoidal thread, for plain high-sealing pipe T, nominal diameter 60 mm, made of steel strength group accepted with determination of impact toughness at low temperatures	T 60-EKh GOST R 52203-2004