GOST 5890-78 Pipe Couplings, Face-Seal Union Type. Specifications

GOST 5890-78

Group D45

State Standard of the Union of Soviet Socialist Republics

PIPE COUPLINGS, FACE-SEAL UNION TYPE

Technical specifications

Pipe connection with screwed ends. Specifications

OKSTU 2952

Effective date 1979-07-01

INTRODUCED by Resolution of the USSR State Committee for Standards of the Council of Ministers dated July 27, 1978 No. 2008

The validity period restriction was lifted by Protocol No. 3-93 of the Interstate Council for Standardization, Metrology and Certification (IUS 5-6-93)

REPLACES GOST 5890-68

REISSUE (July 1998) with Amendments No. 1, 2, 3, approved in December 1983, October 1985, November 1988 (IUS 3-84, 2-86, 2-89)

This standard applies to face-seal union pipe couplings and fittings with a nominal pressure of up to 10 MPa (up to 100 kgf/cm), used in piping systems of ships, vessels and watercraft, including for export.

(Amended edition, Amendment No. 1).

1. TYPES, BASIC PARAMETERS AND DIMENSIONS

1.1. The types and basic parameters of face-seal union pipe couplings and fittings shall comply with the values given in Table 1.

Table 1

Type	Designation	, mm	, MPa (kgf/cm)	Material
1	Face-seal union-nut coupling, lap type	3-32	10 (100)	Carbon and corrosion-resistant steel, brass, bronze
2	Face-seal union-nut coupling, butt type	10-32		Carbon and corrosion-resistant steel
3	Face-seal union-nut reducing coupling, lap type			Carbon and corrosion-resistant steel, brass, bronze
4	Face-seal union-nut reducing coupling, butt type			Carbon and corrosion-resistant steel
5	Intermediate fitting, butt type	10-32
6	Intermediate fitting, lap type	3-32		Carbon and corrosion-resistant steel, brass, bronze
7	Screw-in fitting	3-32
8	Screw-in fitting with male-threaded end for metric thread	3-25
		3-32	1.6 (16)
9	Screw-in fitting with male-threaded end for pipe thread	6-32	1.6 (16)	Carbon and corrosion-resistant steel, brass, bronze
10	Welded fitting	3-32	4.0 (40)

Note. Face-seal union couplings with a nominal bore of 32, intended for steam, shall be used at a nominal pressure of not more than 4.0 MPa (40 kgf/cm).

1.2. The design and basic dimensions of face-seal union pipe couplings and fittings shall comply with the values shown in Fig. 1-9 and Table 2-7.

Fig. 1

Type 1

1 - nipple; 2 - nut; 3 - gasket

Fig. 1

Fig. 2

Type 2

1 - nipple; 2 - nut; 3 - gasket

Fig. 2

Fig. 3

Type 3

1 - nipple; 2 - nut; 3 - gasket

Fig. 3

Fig. 4

Type 4

1 - nipple;

2 - nut;

3 - gasket

Fig. 4

Fig. 5

Type 5

Fig. 5

Fig. 6

Type 6

Fig. 6

Fig. 7

Type 7

Fig. 7

Fig. 8

Types 8 and 9

Fig. 8

Fig. 9

Type 10

Fig. 9

Table 2

Dimensions, mm

						Mass of pipe couplings, kg
						carbon steel		corrosion-resistant steel		brass	bronze
			Type 1	Type 2		Type 1	Type 2	Type 1	Type 2	Type 1
3	M18x1.5	6	26	-	24	0.060	-	0.060	-	0.060	0.060
6	M22×1.5	10	27	-	30	0.095	-	0.095	-	0.100	0.090
10	M27×1.5	14	31	55	36	0.140	0.180	0.140	0.180	0.140	0.135
15	M36×2	22	41	63	46	0.255	0.310	0.255	0.310	0.260	0.240
20	M39×2	25	44	66	46	0.260	0.360	0.260	0.360	0.265	0.250
25	M48×2	32	49	69	55	0.370	0.450	0.370	0.450	0.370	0.360
32	M56×2	38	53	74	65	0.590	0.720	0.590	0.720	0.600	0.570

Note. The mass of pipe couplings is given excluding the mass of gaskets.

Table 3

Dimensions, mm

							Mass of pipe couplings, kg
							carbon steel		corrosion-resistant steel		brass	bronze
				Type 3	Type 4		Type 3	Type 4	Type 3	Type 4	Type 3
6	3	M22×1.5	6	27	-	30	0.100	-	0.100	-	0.100	0.095
10	3	M27×1 5		31	-	36	0.150	-	0.150	-	0.160	0.150
	6		10				0.150	-	0.150	-	0.155	0.145
15	6	M36×2		41	-		0.300	-	0.300	-	0.300	0.280
	10		14		63	46	0.290	0.310	0.290	0.310	0.290	0.270
20	10	M39×2		44	66		0.310	0.340	0.310	0.340	0.315	0.300
	15		22				0.285	0.320	0.285	0.320	0.290	0.270
25	15	M48×2		49	71	55	0.440	0.470	0.440	0.470	0.450	0.420
	20		25				0.425	0.490	0.425	0.490	0.435	0.410
32	20	M56×2		53	75	65	0.710	0.730	0.710	0.780	0.730	0.690
	25		32				0.660	0.730	0.660	0.730	0.670	0.640

Note. The mass of pipe couplings is given excluding the mass of gaskets.

Table 4

Dimensions, mm

												Mass of fitting, kg
		For steel and brass	For bronze		For steel	For brass and bronze	For lap-type couplings	For butt-type couplings		For steel and brass	For bronze	carbon steel		corrosion-resistant steel		brass	bronze
												Type 5	Type 6	Type 5	Type 6	Type 6
3	M18×1.5	21.9	19.6	-	6.5	6	27	-	6	19	17	-	0.050	-	0.050	0.055	0.050
6	M22×1.5	27.7	21.9	-	10.5	10	28	-	7	24	19	-	0.065	-	0.070	0.070	0.065
10	M27×1.5	34.6	25.4	10	14.5	14	31	56	8	30	22	0.135	0.125	0.160	0.125	0.135	0.120
15	M36×2	47.3	36.9	18	22.5	22	41	66	11	41	32	0.315	0.290	0.340	0.295	0.320	0.280
20	M39×2	47.3	41.6	19	25.5	25	45	70	14	41	36	0.385	0.320	0.415	0.325	0.350	0.310
25	M48×2	57.7	47.3	26	32.5	32	49	74	15	50	41	0.560	0.465	0.540	0.470	0.510	0.455
32	M56×2	69.3	57.7	32	38.5	38	52	77	16	60	50	0.800	0.670	0.780	0.675	0.730	0.650

Table 5

Dimensions, mm

							Mass of Type 7 fitting, kg
		For steel and brass	For bronze		For steel and brass	For bronze	carbon steel	corrosion-resistant steel	brass	bronze
3	M18x1.5	21.9	19.6	49	19	17	0.085	0.085	0.090	0.085
6	M22x1.5	27.7	21.9	54	24	19	0.135	0.135	0.145	0.130
10	M27×1.5	34.6	25.4	58	30	22	0.210	0.210	0.230	0.210
15	M36×2	47.3	36.9	77	41	32	0.510	0.515	0.555	0.495
20	M39×2	47.3	41.6	77	41	36	0.515	0.520	0.560	0.500
25	M48×2	57.7	47.3	87	50	41	0.860	0.870	0.935	0.835
32	M56×2	69.3	57.7	93	60	50	1.660	1.670	1.795	1.620

Note. In Tables 4 and 5, the hexagon dimensions and mass are given on the condition that parts are made of carbon and corrosion-resistant steel, of hexagonal-section brass stock, and of round-section bronze stock.

If parts are made from a different range or type of stock, the hexagon dimensions and mass shall be specified in the working drawings.

Table 6

Dimensions, mm

	Type 8	Type 9		Type 8	Type 9	Type 8	Type 9	Type 8	Type 9	Type 8		Type 9
										, MPa (kgf/cm)
										up to 1.6 (16)	up to 10.0 (100)	up to 1.6 (16)
3	M14×1.5	-	M18x1.5	22	-	19.6	-	3	-	42	45	-
6	M16×1.5	G	M22×1.5	25	22	21.9	21.9	6	5	47	49	46
10	M24×2	G	M27×1.5	34	25	25.4	21.9	10	8	51	55	51
15	M30×2	G	M36×2	40	30	36.9	25.4	18	12	65	70	62
20	M33×2	G	M39×2	45	35	41.6	34.6	20	17	68	74	66
25	M39×2	G1	M48×2	50	45	47.3	41.6	27	23	74	82	73
32	M48×2	G	M56×2	60	55	57.7	53.1	32	30	79	-	79

Continuation of Table 6

Dimensions, mm

	S		Mass of fitting, kg
	Type 8	Type 9	carbon steel			corrosion-resistant steel			brass			bronze
			Type 8		Type 9	Type 8		Type 9	Type 8		Type 9	Type 8		Type 9
			, MPa (kgf/cm)
			up to 1.6 (16)	up to 10.0 (100)	up to 1.6 (16)	up to 1.6 (16)	up to 10.0 (100)	up to 1.6 (16)	up to 1.6 (16)	up to 10.0 (100)	up to 1.6 (16)	up to 1.6 (16)	up to 10.0 (100)	up to 1.6 (16)
3	17	-	0.080	0.085	-	0.080	0.085	-	0.085	0.090	-	0.075	0.080	-
6	19	19	0.110	0.115	0.095	0.110	0.115	0.100	0.120	0.120	0.105	0.105	0.110	0.095
10	22	19	0.180	0.190	0.145	0.180	0.195	0.150	0.195	0.210	0.160	0.175	0.190	0.145
15	32	22	0.320	0.340	0.270	0.325	0.345	0.275	0.350	0.370	0.290	0.315	0.330	0.260
20	36	30	0.380	0.410	0.370	0.390	0.415	0.375	0.420	0.445	0.400	0.380	0.410	0.360
25	41	36	0.570	0.610	0.535	0.575	0.620	0.540	0.620	0.660	0.580	0.550	0.590	0.520
32	50	46	0.700	-	0.810	0.710	-	0.820	0.755	-	0.880	0.670	-	0.790

Table 7

Dimensions, mm

							Mass of Type 10 fitting, kg
							carbon steel	corrosion-resistant steel	brass	bronze
3	M18x1.5		35				0.040	0.040	0.040	0.040
		12		15	2	10
6	M22x1.5		37				0.055	0.055	0.060	0.055
10	M27x1.5	20	41	18	3	17	0.100	0.105	0.125	0.100
15	M36×2	25	47	19	4	22	0.195	0.200	0.210	0.190
20	M39×2	31	51	22	5	27	0.230	0.240	0.250	0.225
25	M48×2	40	63	25	6	36	0.440	0.450	0.480	0.430
32	M56×2	46	70	30	9	41	0.640	0.650	0.700	0.625

Example of designation for a face-seal union coupling of carbon steel, Type 1, size 20:

Coupling 1-20 St. GOST 5890-78

Same, made of corrosion-resistant steel:

Connection 1-20 corr. steel GOST 5890-78

Same, made of bronze, type 3, 15/10:

Connection 3-15/10 bronze GOST 5890-78

Unions made of brass, type 10, 20:

Union 10-20 brass GOST 5890-78

(Revised edition, Amendment No. 1, 3).

2. Technical requirements

2.1. Union-face connections and unions shall be manufactured in accordance with the requirements of this standard, per working drawings approved in the established procedure.

(Amended edition, Amendment No. 1).

2.2. Connecting dimensions of unions shall comply with GOST 2822-78.

2.3. Limit deviations of “width across flats” dimensions shall comply with GOST 6424-73.

2.4. Pipes for union-face connections made of carbon steel shall comply with the requirements of GOST 8731-74 and GOST 8733-74; those made of corrosion-resistant steel shall comply with GOST 9941-81; copper pipes shall comply with GOST 617-90; and copper-nickel pipes shall comply with GOST 17217-79.

2.5. Unspecified limit deviations of dimensions: for holes - H14, for shafts - h14, for others - (±).

(Amended edition, Amendment No. 1).

2.6. Operation of union-face connections and unions under various climatic conditions specified in GOST 15150-69 is ensured by protective coatings in accordance with the pipeline assembly drawing.

2.7. Union-face connections and unions made of carbon steel, together with pipes for sea and fresh water, except for the thread, shall be hot-dip galvanized in accordance with standards and technical specifications.

(Amended edition, Amendment No. 1).

2.8. Parts of union-face connections and unions shall be made of the materials specified in Tables 8 and 9.

Table 8

Connection type	Material grade		Medium conveyed
	Nipple	Union nut
1, 2 3, 4	Steel grade 25 per GOST 1050-88	Steel grade 35 per GOST 1050-88	Sea and fresh water, oil fractions, heavy petroleum products, air
		Steel grade 38KhA per GOST 4543-71	Steam at temperatures up to 673 K (400 °C)
	Steel grade 08Kh18N10T per GOST 5632-72	Bronze grade BrAZhMts10-3-1.5 per GOST 18175-78	Distilled water, condensate, non-flammable hydraulic system fluids, oil fractions, samin, air, light petroleum products, steam at temperatures up to 523 K (250 °C)
		Steel grade 38KhA per GOST 4543-71	Steam at temperatures from 524 to 673 K (251 to 400 °C)
1, 3	Brass grade LMts58-2 per GOST 15527-70	Steel grade 35 per GOST 1050-88	Condensate, non-flammable hydraulic system fluids, oil fractions, air, steam at temperatures up to 523 K (250 °C)
	Bronze grade BrAZhNMts9-4-4-1 per standards and technical specifications approved in the established procedure	Bronze grade BrAZhMts10-3-1.5 per GOST 18175-78	Sea water
	Bronze grade BrAMts9-2 per GOST 18175-78		Condensate, non-flammable hydraulic system fluids, oil fractions, air, steam at temperatures up to 523 K (250 °C)

Table 9

Connection type	Material grade	Medium conveyed
5, 6, 7, 8, 9, 10	Steel grade 25 per GOST 1050-88	Sea and fresh water, oil fractions, light and heavy petroleum products, air, steam at temperatures up to 673 K (400 °C)
5, 6, 7, 8, 9, 10	Steel grade 08Kh18N10T per GOST 5632-72	Distilled water, condensate, non-flammable hydraulic system fluids, oil fractions, light petroleum products, samin, air, steam at temperatures up to 673 K (400 °C)
6, 7, 8, 9, 10	Brass grade LMts58-2 per GOST 15527-70	Condensate, non-flammable hydraulic system fluids, oil fractions, air, steam at temperatures up to 523 K (250 °C)
6.10	Bronze grade BrAMts9-2 per GOST 18175-78
6, 7, 8, 9, 10	Bronze grade BrAZhNMts9-4-4-1 per standards and technical specifications approved in the established procedure	Sea water

Notes:

1. Union-face connections with nipple and unions made of bronze grade BrAMts9-2 are used in rooms with high humidity and where electric welding of pipelines is required.

2. Unions may be made of steel grade 20 instead of steel grade 25.

3. The term “oil fractions” means diesel, industrial, and turbine oils

(Revised edition, Amendment No. 3).

2.9. Gasket materials shall be selected depending on the media conveyed and operating pressures in accordance with drawings and technical specifications.

(Amended edition, Amendment No. 1).

2.10. (Deleted, Amendment No. 1).

2.11. The established service life of union-face connections and unions shall be not less than the established service life of the pipeline on which these connections and unions are used.

(Amended edition, Amendment No. 1).

2.12. The weight deviation of connections and unions shall not exceed +4%.

(Added, Amendment No. 1).

3. ACCEPTANCE RULES

3.1. Acceptance tests are established to verify the conformity of union-face connections and unions to the requirements of this standard.

3.2. Acceptance tests shall be performed on 10% of a batch of union-face connections or unions, but not less than 10 pcs.

(Revised edition, Amendment No. 3).

3.3. During acceptance tests, union-face connections and unions shall be checked for conformity to the requirements of items 1.1; 1.2; 2.1-2.3; 2.5; 2.8.

3.4. (Deleted, Amendment No. 1).

4. TEST METHODS

4.1. The design of union-face connections and unions shall be checked by comparison with the drawings, and the dimensions by measuring instruments providing the required accuracy.

4.2. The appearance of union-face connections and unions, and the marking per items 2.1 and 5.1, shall be checked by visual inspection.

4.3. The quality of materials per items 2.8 and 2.9 shall be verified against certificates.

5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. Each union and nipple made of corrosion-resistant steel and bronze grade BrAMts9-2 shall bear a circumferential mark; those made of bronze grade BrAZhNMts9-4-4-1 shall bear two marks. The location of the marks shall be in accordance with the technical specifications.

No marks are applied to unions and nipples made of carbon steel and brass.

5.2. Union-face connections and unions shall be packed in boxes per GOST 2991-85. The boxes shall have partitions between rows to protect the products from mechanical damage and corrosion.

Marking of transport packaging shall comply with GOST 14192-96.

5.1, 5.2. (Revised edition, Amendment No. 1).

5.3. The gross weight of a box shall not exceed 80 kg.

5.4. Each box shall contain union-face connections or unions of one type.

By agreement with the customer, union-face connections or unions of different types may be packed in a single box. In this case, each type shall be packed in bags or boxes. Each bag or box shall indicate the designation of the products and their quantity. By agreement between the customer and the manufacturer, union-face connections may be transported without gaskets.

(Amended edition, Amendment No. 1).

5.5. Each box shall contain a document specifying:

name of the manufacturer;

product designation;

quantity of products of each type;

date of manufacture;

designation of this standard.

5.6. Union-face connections and unions shall be transported in packaging by all modes of transport under conditions specified for category Zh3 per GOST 15150-69.

5.7. Storage and preservation of union-face connections and unions shall comply with group 1-2 of GOST 9.014-78.

(Amended edition, Amendment No. 1).

6. MANUFACTURER’S WARRANTY

6.1. The manufacturer guarantees that union-face connections and unions conform to the requirements of this standard, provided the customer complies with the rules for operation, transportation, and storage.

6.2. The warranty period for union-face connections and unions shall comply with OST 5.5536-83.

6.1, 6.2. (Revised edition, Amendment No. 2, 3).