GOST 16078-70 Internal Cone Pipe Connections. Technical Requirements

GOST 16078-70*

Group G18

State Standard of the Union of Soviet Socialist Republics

INTERNAL CONE PIPE CONNECTIONS

Technical requirements

Tube connections on internal cone. Technical requirements

Effective date 1971-01-01

By Decree No. 839 of the Committee for Standards, Weights and Measuring Instruments under the Council of Ministers of the USSR dated 5 June 1970, the effective date was set at 01.01.71

• REISSUE (June 1987) with Amendments No. 1, 2, approved in December 1980 and February 1986 (IUS 3-81, 5-86).

This standard applies to internal cone pipe connections used in various liquid and gas media, including corrosive media, for operation at temperatures from minus 60 to plus 500 °C and pressures up to 650 kgf/cm (65 MPa) — depending on the materials used, the pipe range, and the type of connection.

Internal cone pipe connections are used on products with piston, gas turbine, and rocket engines, as well as in ground support equipment systems servicing these products.

(Amended version, Amendment No. 2).

1. TECHNICAL REQUIREMENTS

1.1. Fittings and internal cone pipe connections are manufactured in accordance with the relevant standards and technical documentation approved in the prescribed manner.

1.2. Internal cone pipe connections with brazed nipples are intended for non-corrosive media; those with welded nipples — for corrosive media.

1.3. Internal cone pipe connections are made in accordance with Tables 1 and 2.

Table 1

Version number	Medium	Drawing
1	Non-corrosive
2
3
4	Corrosive
5
6

Table 2

Permissible combinations of pipe and part materials

	Part 1	Part 2	Part 3	Part 4	Part 5	Part 6	Part 7	Part 8	Part 9	Part 10
Ver- sion num- ber	Pipe	Hemispheri- cal brazed nipple GOST 16040-70	Union nut for hemispheri- cal nipple GOST 16046-70	Union nut for spherical nipple GOST 16047-70	Thrust ring GOST 16048-70	Brazed spher- ical nipple GOST 16041-70	Brazed union GOST 16044-70	Welded hemispher- ical nipple GOST 16042-70	Welded spheri- cal nipple GOST 16043-70	Welded un- ion GOST 16045-70
	Steel grade
1	20; 20A	25	45	-	-	-	-	-	-	-
	12Kh18N10T	12Kh18N9T	13Kh11N2V2MF	-		-	-
2	20; 20A	-	-	45	13Kh11N2V2MF	25	-
	12Kh18N10T	-	-	13Kh11N2V2MF		12Kh18N9T	-
3	20; 20A	-	-	-	-	-	25
	12Kh18N10T	-	-	-	-	-	12Kh18N9T
4	12Kh18N10T	-	13Kh11N2V2MF	-	-	-	-	12Kh18N10T	-	-
5			-	13Kh11N2V2MF	13Kh11N2V2MF			-	12Kh18N9T	-
6			-	-	-			-	-	12Kh18N9T

1.4. The outer diameter and wall thickness of pipes correspond to those specified in Tables 3 and 4.

Table 3

Dimensions, mm

Outer diameter of pipes	Pipe steel grade per GOST 19277-73	Versions
		1-2-3			4-5-6
		0.8	1.0	1.2	1.0	1.2
		Mass of 1 m of pipe, kg
6	20A	0.103	0.123	0.142	-		-
	12Kh18N10T	0.105	0.125	0.145	0.125		-
8	20A	0.142	0.173	0.202	-		-
	12Kh18N10T	0.145	0.176	0.205	0.176		-
10	20A	0.182	0.222	0.261	-		-
	12Kh18N10T	0.185	0.226	0.266	0.226		-
12	20A	0.221	0.271	0.320	-		-
	12Kh18N10T	0.224	0.276	0.326	0.276		-
14	20A	0.260	0.321	0.379	-		-
	12Kh18N10T	0.264	0.327	0.382	0.327		-
16	20A	0.300	0.370	0.438	-		-
	12Kh18N10T	0.303	0.376	0.447	0.376		-
18	20A	0.340	0.419	0.497	-		-
	12Kh18N10T	0.342	0.427	0.500	0.427		0.500
20	20A	0.379	0.469	0.556	-		-
	12Kh18N10T	0.382	0.478	0.568	0.478		0.568
22	20A	0.419	0.518	0.616	-		-
	12Kh18N10T	0.423	0.528	0.627	0.528		0.627
25	20A	0.478	0.592	0.703	-		-
	12Kh18N10T	0.481	0.595	0.710	0.595		0.710
28	20A	0.536	0.666	0.792	-		-
	12Kh18N10T	0.541	0.670	0.800	0.670		0.800
30	20A	0.576	0.715	0.851	-		-
	12Kh18N10T	0.580	0.729	0.866	0.729		0.866
32	20A	0.615	0.755	0.910	-		-
	12Kh18N10T	0.625	0.770	0.918	0.770		0.918
34	20A	0.655	0.814	0.968	-		-
	12Kh18N10T	0.660	0.845	0.980	0.845		0.980
36	20A	0.695	0.863	1.027	-		-
	12Kh18N10T	0.705	0.870	1.040	0.870		1.040
38	20A	0.734	0.912	1.087	-		-
	12Kh18N10T	0.740	0.920	1.110	0.920		1.110

Table 4

Dimensions, mm

Outer diameter of pipes	Pipe steel grade per GOST 8733-74 and GOST 9941-81	Versions
		1-2-3			4-5-6
		0.8	1.0	1.2	1.0	1.2
		Mass of 1 m of pipe, kg
6	20	0.103	0.123	-	-	-
	12Kh18N10T	0.105	0.125	0.145	1.125	-
8	20	0.142	0.173	-	-	-
	12Kh18N10T	0.145	0.176	0.205	0.176	-
10	20	0.182	0.222	-	-	-
	12Kh18N10T	0.185	0.226	0.266	0.226	-
12	20	0.221	0.271	-	-	-
	12Kh18N10T	0.224	0.276	0.326	0.276	-
14	20	0.260	0.321	-	-	-
	12Kh18N10T	0.264	0.327	0.382	0.327	-
16	20	0.300	0370	-	-	-
	12Kh18N10T	0.303	0.376	0.447	0.376	-
18	20	0.340	0.419	-	-	-
	12Kh18N10T	0.342	0.427	0.500	0.427	0.500
20	20	0.379	0.469	-	-	-
	12Kh18N10T	0.382	0.478	0.568	0.478	0.568
22	20	0.419	0.518	-	-	-
	12Kh18N10T	0.423	0.528	0.627	0.528	0.627
24	20	0.458	0.567	-	-	-
25	12Kh18N10T	0.481	0.595	0.710	0.595	0.710
28	20	0.536	0.666	-	-	-
	12Kh18N10T	0.541	0.670	0.800	0.670	0.800
30	20	0.576	0.715	-	-	-
	12Kh18N10T	0.580	0.729	0.866	0.729	0.866
32	20	0.615	0.755	-	-	-
	12Kh18N10T	0.625	0.770	0.918	0.770	0.918
34	20	0.655	0.814	-	-	-
	12Kh18N10T	0.660	0.845	0.980	0.845	0.980
36	20	0.695	0.863	-	-	-
	12Kh18N10T	0.705	0.870	1.040	0.870	1.040
38	20	0.734	0.912	-	-	-
	12Kh18N10T	0.740	0.920	1.110	0.920	1.110

(Amended edition, Amendment No. 1).

1.5. Pipes and fittings for internal cone pipe connections are made of the materials specified in Table 5.

(Amended edition, Amendment No. 1, 2).

1.6. Designations of material groups and grades for pipe connection fittings correspond to those specified in Table 6.

(Amended version, Amendment No. 2).

1.7. Combinations of pipe material with fitting material and the permissible application temperatures correspond to those specified in Table 7.

Table 5

Material	Steel grade	Technical documentation for the material
		Standard version	For aviation and general engineering products	Range
Pipes	12Kh18N10T (Kh18N10T)	GOST 9941-81, high precision	GOST 19277-73	-
	20A	-
	20	GOST 8733-74	-	GOST 9567-75
Bars for nipples, unions, nuts, straight connectors, adapters, thrust rings, plugs	25	GOST 1050-74 GOST 1051-73		GOST 2590-71, standard precision; GOST 7417-75, grade 5 precision; GOST 8560-78, grade 5 precision
	45	GOST 1051-73	TU 14-1-2330-77
	38KhA		TU 14-1-950-74
	12Kh18N9T (Kh18N9T)	GOST 5949-75	TU 14-1-377-72* TU 14-1-378-72*
	13Kh11N2V2MF (1Kh12N2VMF)		TU 14-1-3297-82
			TU 14-1-1791-76*	GOST 8560-78, grade 4 precision
Stampings for elbows, tees, and crosses	45	GOST 1050-74	OST 1 90085-73 gr.III	-
	38KhA	GOST 4543-71
	12Kh18N9T (Kh18N9T)	GOST 5949-75	OST 1 90176-75 gr.III
	13Kh11N2V2MF (1Kh12N2VMF)
Sheets for washers	20	GOST 16523-70 and GOST 9045-80		GOST 19903-74, GOST 19904-74

Notes:

1. Turning bars made of steel grade 45 are supplied in the normalized condition.

2. Substitution of materials is permitted: steel grade 12Kh18N9T with steel grade 12Kh18N10T; steel grade 13Kh11N2V2MF (for nuts) with steel grade 14Kh17N2 per GOST 5949-75 (standard version) and TU 14-1-377-72, TU 14-1-378-72 for operating temperatures up to 400 °C. If materials are substituted, the fitting designation shall indicate the corresponding designation of the substitute material grade.

Table 6

Steel group	Group designation	Material grades	Material grade designation
Stainless	01	13Kh11N2V2MF	011
		12Kh18N9T, 12Kh18N10T	012
		14×17N2	013
Alloy and carbon steels	02	38KhA	021
		45	022
		25	023

Table 7

Fitting type	Fitting material grade	Pipe material grade	Temperature, °C
Union nuts, connectors and adapters, elbows, tees, crosses, plugs, thrust rings	13Kh11N2V2MF (1Kh12N2VMF)	12Kh18N10T (Kh18N10T)	500
Nipples, fittings, connectors and adapters, elbows, tees, plugs	12Kh18N9T (Kh18N9T)
Connectors and adapters, elbows, tees, crosses	38KhA	20A; 20	250
Union nuts, connectors and adapters, elbows, tees, crosses, plugs	45
Nipples, fittings	25

1.8. The working pressures inside pipelines and the tightening torques of union nuts for pipeline connections made of steel grades 20A and 12Kh18N10T, with a pipe wall thickness of 1 mm at normal temperature, correspond to those given in Table 8.

Table 8

Outer diameter of pipes	Working pressure in kgf/cm (MPa) for pipe steel grades		Tightening torques, N·m (kgf·cm)
	20A	12Kh18N10T	Working		Maximum permissible
			Nom.	Limit deviation
6	430 (43.0)	650 (65.0)	16.0 (160)	+5.0 (50)	30.0 (300)
8	310 (31.0)	475 (47.5)	22.0 (220)		39.0 (390)
10	240 (24.0)	370 (37.0)	27.0 (270)		49.0 (490)
12	195 (19.5)	300 (30.0)	33.0 (330)		58.0 (580)
14	165 (16.5)	260 (26.0)	38.0 (380)		67.0 (670)
16	140 (14.0)	200 (20.0)	45.0 (450)		77.0 (770)
18	125 (12.5)	175 (17.5)	50.0 (500)		87.0 (870)
20	110 (11.0)	160 (16.0)	56.0 (560)	+7.0 (70)	96.0 (960)
22	100 (10.0)	145 (14.5)	62.0 (620)		106.0 (1060)
25	95 (9.5)	115 (11.5)	70.5 (705)		120.0 (1200)
28	80 (8.0)	115 (11.5)	79.0 (790)	+9.0 (90)	135.0 (1350)
30	70 (7.0)	100 (10.0)	85.0 (850)		145.0 (1450)
32			93.0 (930)	+10.0 (100)	155.0 (1550)
34	65 (6.5)	90 (9.0)	101.0 (1010)		165.0 (1650)
36		85 (8.5)	104.0 (1040)	+12.0 (120)	170.0 (1700)
38	60 (6.0)		113.0 (1130)		185.0 (1850)

(Amended version, Amendment No. 2).

1.9. The working pressures in MPa given in Table 8 are calculated using the formula

,

where — safety factor, equal to 3.15;

— minimum failure pressure, calculated using the formula

,

where — internal diameter of the pipe in mm;

— minimum wall thickness in mm;

— tensile strength in MN/m.

1.10. When using pipeline connections specified by this standard, it should be taken into account that the fatigue limits () of pipeline connections made of grade 12Kh18N10T, with outer diameter and wall thickness of 12×0.9 mm and 12×1 mm, with brazed-on nipples, are:

when brazed with a gas torch, 176.5 MN/m (18 kgf/mm);

when brazed with high-frequency currents, 198.1 MN/m (20.2 kgf/mm).

Note. Pipe material — per GOST 19277-73.

1.9, 1.10. (Revised edition, Amendment No. 1, 2).

1.11. Limit deviations of dimensions of machined surfaces not restricted by tolerances — 12, 12.

1.12. Limit deviations of dimensions of non-machined surfaces of stamped fittings, except for the width-across-flats dimension, correspond to those given in Table 9. Stamping radii not specified in the standards are 2.5 mm. Stamping draft angles shall not exceed 5°. The permissible offset at the die parting plane is 0.3 mm.

1.11, 1.12. (Revised edition, Amendment No. 1).

1.13. Limit deviations of the width-across-flats dimension are per 12. The width-across-flats surfaces of bosses must be calibrated.

1.14. Metric thread — tolerance zones per GOST 16093-81; 6e for external threads, 5H6H for internal threads. Thread undercuts (narrow) and chamfers not specified in the standards are per GOST 10549-80.

(Amended edition, Amendment No. 1).

1.15. The radial runout tolerance of conical surfaces with an angle of 60±1° relative to the axes of the corresponding threads is 0.1 mm.

(Amended version, Amendment No. 2).

Table 9

mm

Linear dimensions and dimensions of bores and shafts	Limit deviation		Fillet radii	Limit deviation
	upper	lower		upper	lower
Up to 16	+0.4	-0.2	1.6	+0.9	-0.3
Over 16 to 25	+0.5	-0.3	2.5	+1.5	-0.5
Over 25 to 40	+0.6	-0.3
Over 40 to 60	+0.8	-0.4

1.16. The following are permitted:

a) offset of the axis of external cylindrical surfaces relative to the axis of the hexagon, not exceeding half the tolerance on the width-across-flats dimension;

b) offset of the axis of external machined cylindrical surfaces relative to the axis of internal cylindrical surfaces, not exceeding half the tolerance on internal diameters;

c) a step of no more than 0.2 mm on the internal surface of the through hole;

d) in all elbows, stepped shoulders may be made instead of fillets at the intersection of drilled holes;

e) in technically justified cases, the width-across-flats dimension of stamped fittings may be obtained by machining, maintaining the required accuracy with a surface roughness parameter of 40 μm.

1.17. Fitting dimensions correspond to those specified in the standards prior to coating.

1.18. Cracks, laps, burrs, scratches, dents and other mechanical damage are not permitted on the surface of fittings.

1.19. Threads must be clean and free of burrs, torn threads and dents.

1.20. The following are permitted:

a) traces of thread on non-machined surfaces of elbows, tees and crosses;

b) minor dents and die marks — not exceeding half the limit deviations;

c) surface defects permitted by the specifications for hexagonal bars from which the parts are made;

d) unmachined areas (flats) on the external cylindrical surface of union nuts per GOST 16046-70 and GOST 16047-70.

1.21. Fittings for pipeline connections are heat-treated as follows:

parts made of steel grade 38KhA to 29.0–35.5 HRC;

parts made of steel grade 13Kh11N2V2MF to 25.0–35.0 HRC;

nuts made of steel grade 14Kh17N2 to 23.0–32.0 HRC;

stamped parts made of steel grades 12Kh18N9T, 12Kh18N10T are hardened; stamped parts made of steel grade 45 are normalized; parts made of steel grades 20, 25, 45 and 12Kh18N9T, 12Kh18N10T, manufactured from sheet or bar, have mechanical properties corresponding to the base material.

1.22. Fittings for pipeline connections have the following protective coatings:

made of steel grades 12Kh18N9T, 13Kh11N2V2MF — chemical passivation;

made of steel grades 45 and 38KhA: external thread — Cd.9, Khim. oks. fos. gfzh with a maximum coating thickness of 12 µm; internal thread — Cd 6, Khim. oks. fos. gfzh with a maximum coating thickness of 9 µm;

pipe ends made of steel grades 20 and 20A with nipples — Cd 15, Khim. oks. fos. gfzh; with unions — Cd 9, Khim. oks. fos. gfzh with a maximum coating thickness of 12 µm.

1.21, 1.22. (Revised edition, Amendment No. 2).

1.23. For fittings in contact with fuel, cadmium plating is replaced with zinc plating of the same coating thickness. For example, instead of the Cd.9 Khim. oks. fos. gfzh coating with a maximum coating thickness of 12 µm, Zn9 Khim. oks. fos. gfzh with a maximum coating thickness of 12 µm is used. In this case, the symbol “Zn” is added to the fitting designation:

Washer 16-Zn GOST 16069-70

1.24. To improve the ease of screwing threaded fittings made of heat-resistant or stainless steels, it is recommended to apply copper plating, electrochemical phosphating, or another coating that improves screwing ease, to the inner surfaces of union nuts — depending on the operating conditions. The thickness of the copper or phosphate layer is 3–6 µm. The type of coating is specified by the customer.

(Revised edition, Amendment 2).

1.25. Additional protective coatings for fittings are specified in accordance with the requirements of technical specifications or product instructions.

1.26. Depending on the operating conditions of the product and the nature of the liquid or gas flowing through the pipeline, the cadmium (zinc) coating may be omitted on the sealing conical and spherical surfaces of connecting fittings.

1.27. Coatings are applied in accordance with documentation approved through the established procedure.

1.28. Preparation for soldering and soldering are performed in accordance with documentation approved through the established procedure.

1.29. To ensure the required clearances for soldering, the pipe ends may be calibrated.

1.30. Before soldering, the pipes are inserted into the corresponding parts (nipples, unions) until they bottom out.

1.31. Preparation for welding and welding are performed in accordance with documentation approved through the established procedure. Welding is performed in a shielding gas atmosphere.

1.32. The warranty service life of pipeline connections must be no less than the warranty service life of the main product in which these connections are used.

2. TEST METHODS

2.1. The following sampling rules and test methods are used for the quality control inspection of fittings:

a) for dimensional inspection and verification of the seating of conical and spherical surfaces of fittings, 3% of samples are taken from the batch, but not fewer than 10 pcs.;

b) the appearance of fittings is checked on every part;

c) for hardness testing, 10% of samples are taken from the batch.

The batch size is established by agreement between the parties.

(Revised edition, Amendment 2).

2.2. Testing of the seating of conical and spherical surfaces of fittings is carried out using a special gauge, based on the paint imprint on the cone (sphere) of the fitting. The imprint must be ring-shaped, continuous, and located in a plane perpendicular to the axis of the cone.

2.3. The appearance of fittings is inspected with the naked eye.

2.4. Parts made from heat-treated bar stock are not subjected to hardness testing.

2.5. If unsatisfactory results are obtained for at least one of the above parameters when testing fittings, repeat testing is carried out on this parameter using double the number of parts taken from the same batch, except for samples checked for hardness — in this case, the entire batch is subjected to repeat testing. If the repeat test results are unsatisfactory, the entire batch is rejected.

2.6. Thread inspection is performed before the coating is applied.

(Added, Amendment No. 1).

3. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

3.1. Each accepted part is marked with the outer diameter values of the pipes for which it is intended, and stamped with the Quality Control Department (QC) stamp.

3.2. Marking and stamping are performed by the impact method. Font sizes and shapes are per GOST 2930-62.

3.3. Thin-walled and small-sized parts, for which the impact method would cause deformation, may be marked and stamped with paint or on a tag, by agreement with the customer.

3.4. The marking and stamp are applied to the faces of the hexagon or on the wrench flats, except for parts for which the marking and stamp location is indicated on the drawings of GOST 16040-70–GOST 16043-70.

3.5. For packaging, the parts are wrapped in oiled paper and placed in wooden boxes (GOST 2991-85) lined inside with moisture-proof material. The packaging must be tight, preventing movement of the parts inside the container during transportation.

3.6. Each box must contain parts of only one name. A packing passport indicating the name, designation, quantity, and manufacturing date of the parts is placed inside the box.

The gross weight of the box must not exceed 32 kg.

3.7. The part designation is applied to the end face of the box using a stencil with durable paint.

3.8. Parts are stored on racks installed in a dry room, protected from mechanical damage and dust.

APPENDIX. EXAMPLES OF PIPE-TO-FITTING CONNECTIONS

Fig. 1. Example of pipe assembly

Part 1 Pipe	Part 2 Hemispherical solder-on nipple, GOST 16040-70	Part 3 Union nut for hemispherical nipple, GOST 16046-70	Part 4 Solder-on union, GOST 16044-70	Part 5 Wire
Steel grade	Quantity
	1	1	1	-
	Designation
204	22-023	22-022	22-023	KS 0.8-1.2 GOST 792-67
12Kh18N10T	22-012	22-011	22-012	12×18N9T 0.8-1.2 GOST 18143-72 GOST 18907-73

Fig. 2. Example of pipe assembly

Part 1 Pipe	Part 2 Hemispherical weld-on nipple, GOST 16042-70	Part 3 Union nut for hemispherical nipple, GOST 16046-70	Part 4 Weld-on union, GOST 16045-70	Part 5 Wire
Steel grade	Quantity
	1	1	1	-
	Designation
12Kh18N10T	22-012	22-011	22-012	12×18N9T 0.8-1.2 GOST 18143-72 GOST 18907-73

Fig. 3. Example of pipe assembly

Part 1 Pipe	Part 2 Spherical weld-on nipple, GOST 16041-70	Part 3 Thrust ring, GOST 16048-70	Part 4 Union nut for spherical nipple, GOST 16047-70	Part 5 Solder-on union, GOST 16044-70	Part 6 Wire
Steel grade	Quantity
	1	1	1	1	-
	Designation
20A	20-023	20-011	22-022	20-023	KS 0.8-1.2 GOST 792-67
12Kh18N10T	20-012		20-011	20-012	12×18N9T 0.8-1.2 GOST 18143-72 GOST 18907-73

Fig. 4. Example of pipe assembly

Part 1 Pipe	Part 2 Spherical weld-on nipple, GOST 16043-70	Part 3 Thrust ring, GOST 16048-70	Part 4 Union nut for spherical nipple, GOST 16047-70	Part 5 Weld-on union, GOST 16045-70	Part 6 Wire
Steel grade	Quantity
	1	1	1	1	-
	Designation
12Kh18N10T	20-012	20-011	20-011	20-012	12×18N9T 0.8-1.2 GOST 18143-72 GOST 18907-73

Fig. 5. Example of pipe assembly with a through elbow

Part 1 Pipe	Part 2 Hemispherical solder-on nipple, GOST 16040-70	Part 3 Through elbow, GOST 16053-70	Part 4 Union nut for hemispherical nipple, GOST 16046-70	Part 5 Wire
Steel grade	Quantity
	2	1	2	-
	Designation
20A	10-023	10-022	10-022	KS 0.8-1.2 GOST 792-67
		10-021
12Kh18N10T	10-012	10-012	10-011	12×18N9T 0.8-1.2 GOST 18143-72 GOST 18907-73
		10-011

Fig. 6. Example of pipe assembly with a through elbow

Part 1 Pipe	Part 2 Hemispherical weld-on nipple, GOST 16042-70	Part 3 Through elbow, GOST 16053-70	Part 4 Union nut for hemispherical nipple, GOST 16046-70	Part 5 Wire
Steel grade	Quantity
	2	1	2	-
	Designation
12Kh18N10T	10-012	10-012	10-011	12×18N9T 0.8-1.2 GOST 18143-72 GOST 18907-73
		10-011

Fig. 7. Example of pipe assembly with a straight bulkhead fitting

To ensure locking, a special lug must be provided if no other structural element can be used for this purpose.

Part 1 Pipe	Part 2 Hemispherical solder-on nipple, GOST 16040-70	Part 3 Elongated straight bulkhead fitting, GOST 16050-70	Part 4 Union nut for hemispherical nipple, GOST 16046-70	Part 5 Nut, GOST 13958-74	Part 6 Sealing ring	Part 7 Washer	Part 8 Wire
Steel grade	Quantity
	2	1	2	1	1	1	-
	Designation
20A	10-023	10-022	10-022	M18×1.5-22	See item 3 of the appendix	10 GOST 16069-70	KS 0.8-1.2 GOST 792-67
		10-021
12Kh18N10T	10-012	10-012	10-011	M18×1.5-012			12×18N9T 0.8-1.2 GOST 18143-72 GOST 18907-73
		10-011

Fig. 8. Example of pipe assembly with a flanged elbow

To ensure locking, a special lug must be provided if no other structural element can be used for this purpose.

Part 1 Pipe	Part 2 Hemispherical solder-on nipple, GOST 16040-70	Part 3 Sealable flanged elbow, GOST 16056-70	Part 4 Union nut for hemispherical nipple, GOST 16046-70	Part 5 Nut, GOST 13958-74	Part 6 Sealing ring	Part 7 Wire
Steel grade	Quantity
	2	1	2	1	1	-
	Designation
20A	10-023	10-022	10-022	M18×1.5-022	See item 3 of the appendix	KS 0.8-1.2 GOST 792-67
		10-021
12Kh18N10T	10-012	10-012	10-011	M18×1.5-012		12×18N9T 0.8-1.2 GOST 18143-72 GOST 18907-73
		10-011

Fig. 9. Example of pipe assembly with a screw-in bulkhead fitting

To ensure locking, a special lug must be provided if no other structural element can be used for this purpose.

Part 1 Pipe	Part 2 Hemispherical weld-on nipple, GOST 16042-70	Part 3 Union nut for hemispherical nipple, GOST 16046-70	Part 4 Sealing ring	Part 5 Screw-in adapter for rubber seal GOST 16070-70	Part 6 Wire
Steel grade	Quantity
	1	1	1	1	-
	Designation
20A	10-023	10-022	See item 3, appendix	10-022	KS 0.8-1.2 GOST 792-67
				10-021
12Kh18N10T	10-012	10-011		10-011	12×18N9T 0.8-1.2 GOST 18143-72 GOST 18907-73
				10-012

Fig. 10. Example of pipe assembly with screw-in elbow

Part 1 Pipe	Part 2 Welded hemispherical nipple GOST 16042-70	Part 3 Union nut for hemispherical nipple GOST 16046-70	Part 4 Screw-in elbow GOST 16072-70	Part 5 Nut	Part 6 Washer	Part 7 Sealing ring	Part 8 Wire
Steel grade	Quantity
	1	1	1	1	1	1	-
	Designation
20A	10-023	10-022	10-022	See item 3 of the appendix			KS 0.8-1.2 GOST 792-67
			10-021
12Kh18N10T	10-012	10-011	10-012				12×18N9T 0.8-1.2 GOST 18143-72 GOST 18907-73
			10-011

Fig. 11. Example of pipe assembly with screw-in adapter

To ensure locking, a special lug must be provided if no other structural element can be used for this purpose.

Part 1 Pipe	Part 2 Hemispherical solder-on nipple, GOST 16040-70	Part 3 Union nut for hemispherical nipple, GOST 16046-70	Part 4 Screw-in adapter for metal seal GOST 16071-70	Part 5 Sealing ring	Part 6 Wire
Steel grade	Quantity
	1	1	1	1	-
	Designation
20A	16-023	16-022	16-022	See item 3 of the appendix	KS 0.8-1.2 GOST 792-67
			16-021
12Kh18N10T	16-012	16-011	16-012		12×18N9T 0.8-1.2 GOST 18143-72 GOST 18907-73
			16-011

1. Wire locking is recommended.

2. The need for locking, sealing, and the type of seal are determined by the designer.

3. Sealing rings, washers, nuts and seats for screw-in and flanged parts, respectively, and instructions for sealing them, shall comply with documentation approved in the established manner, and with GOST 9833-73, GOST 19528-74–GOST 19532-74.

(Amended edition, Amendment No. 1).

4. When assembling pipelines, it is recommended to lubricate the threads of the parts, provided this does not conflict with the requirements for the system or the product. The type of lubricant is determined by the designer based on its purpose and the operating conditions of the system.