Connections of pipelines on the outer cone gost

UDC 62t.643.4:006.354 Group G18

STATE STANDARD OF THE UNION OF THE SSR

GOST

PIPING CONNECTIONS

BY OUTER CONE 13977-74 1 2

Specifications

Tube connections on external cone. Specifications

Decree State Committee standards of the Council of Ministers of the USSR dated September 10, 1974 No. 3124, the deadline for introduction is set

Checked in 1985

Non-compliance with the standard is punishable by law

This standard applies to pipe connections along the outer cone, used in various liquid and gaseous media, including aggressive ones, at temperatures from minus 60 to plus 500 ° C and pressures up to 106 MPa (1060 kgf / cm 2), in depending on the materials of pipes and fittings on aircraft and their service facilities.

It is allowed to use these connections in other types of equipment, subject to the requirements of this standard.

1. TECHNICAL REQUIREMENTS

1.1. Grades of reinforcement materials, a combination of materials for pipes and fittings and the permissible temperatures for their use must correspond to those indicated in Table. 1. Examples of assembling pipes and fittings are given in Appendix 1.

* Reissue (January 1988) with Amendments L® 1, 2, approved in December 1980, January 1986 (I US 3-81, 5-86).

Reinforcement type	Material Grades	Permissible temperature in C
Reinforcement type	fittings	Permissible temperature in C
Pipes, adapters, elbows, tees, crosses, plugs, plugs, covers	13X11N2V2MF (1X12N2VMF)
Nipples, union nuts, nuts
Pipes, adapters, elbows, tees, crosses, washers, plugs, covers

Cap nuts ^ nuts, passages, adapters, elbows, tees, crosses, plugs, plugs, covers


Nuts, union nuts, passages, adapters, plugs, plugs, covers
	45, ZOHGSA
Elbows, tees, crosses

Nipples, union nuts, nuts
Pipes, adapters, elbows, tees, crosses	Br.AZHMTsYU-3 -1.5

3.2. The material for pipes and fittings must comply with the technical documentation specified in Table. 2.

GOST 13977-74 S. 11

1.6. Operating and maximum allowable tightening torques of union nuts ^ pipeline connections made of steel grades 20A, 12X18H10T and aluminum alloy when testing them for tightness by hydraulic or air pressure must correspond to those indicated in the table. 5.

Table 5

Pipe size £> H XS, mm	Tightening torques, Nm (kgcm), for pipes made of
	steel grades 20 A and 12XI8H10T		aluminum alloy
		Maximum admissible		Maximum admissible
		Maximum admissible		Maximum admissible

Note. Tightening the union nuts of connections for which no torque values are specified should be done with wrenches in accordance with GOST 2839-80 and GOST 2841-80.

1.2-1.6.

1.7. Tightening of union nuts of pipeline connections during assembly on products is carried out with keys in accordance with GOST 2839-80 or GOST 2841-80.

The union nuts for critical connections are tightened with calibrated wrenches.

1.8. Fittings for pipeline connections must be heat-treated:

parts made of ZOHGSA grade steel by 29.0^-35.5. NKS E;

nipples and nuts made of steel grade 14X17H2 by 23.0-^32.0 HRC S; parts made of steel grade 13Kh11N2V2MF by 25.0-^35.0 HRC S; parts made of steel grade 12X18H9T and 12X18H10T are hardened; hot-forged parts made of aluminum alloys are hardened and aged according to T or T1 modes;

stamped parts made of steel grade 45 are normalized; parts made of steel grade 10X11H23T3MP for HRC 3 >32.0; parts made of steel grade 1X16H2AM by 25.0 - * -35.0 HRC 3; details with unspecified heat treatment must have mechanical properties corresponding to source material.

(Revised edition, Rev. No. 2).

1.9. Fittings for pipeline connections must have the following protective coatings according to GOST 9.306-85:

From stainless steel and bronze - Chem. Pass.;

From carbon and alloy steel: with internal thread- Kdb-9. Chem. ok. Phos. gfzh; With external thread- Kd9-12Khim.oks.fos.gfzh and without thread - Kd15.hr.;

From aluminum alloys - An.Ox.hr.

To improve the screwing of threaded fittings made of stainless steels, the inner surfaces of cap nuts may be subjected to copper plating (for operating temperatures up to 300 °C) or electrochemical phosphating with a thickness of 0.003-0.006 mm (for operating temperatures up to 500 °C). In this case, the letters M or Ef are entered into the designation of the nut *, respectively, for example:

Other types of coatings that improve the screwing are allowed.

For fittings in contact with fuel, cadmium plating must be replaced by zinc plating with the same coating thickness, while the letter C is entered into the designation of fittings, for example:

For parts made of carbon steels operating in oil, it is allowed to use the Chemical coating instead of cadmium plating. Ok. prm, while the letter “O” must be entered in the designation of parts, for example:

Coating technology - according to technical documentation approved in the prescribed manner.

(Changed edition, Rev. No. 1,2).

1.10. Fittings made of aluminum alloys may be subjected to color anodizing in colors corresponding to the color marking of pipelines.

1.11. Additional protective coatings of reinforcement should be assigned in accordance with the technical documentation approved in the prescribed manner.

1.12. By agreement of the parties, it is allowed: not to cadmium (not zincate) the sealing conical and inner cylindrical surfaces of the connecting fittings that are in contact with the working fluid; replacement of cadmium plating (zinc plating) with Khim.oks.fos.gfzh coating for the screw-in part of screw-in fittings; lack of hydrophobization of parts. In this case, respectively, the letters U, V, G are entered into the designation of the reinforcement.

(Revised edition, Rev. No. 2).

1.13. Cracks, captivity, burrs, risks, dents and other mechanical damage are not allowed on the surface of the reinforcement.

1.14. The thread must be clean and free of burrs, broken threads and dents.

1.15. Allowed:

a) thread marks on the surface of the centering collar and on the unmachined surfaces of elbows, tees and crosses;

b) minor dents and traces of stamps - no more than half of the maximum deviations for the corresponding size of the reinforcement;

c) surface defects allowed by the technical specifications for the bars from which the parts are made;

d) on the outer cylindrical surfaces of the cap nuts, untreated places (flats);

e) an increase in the diameter of the centering belt of the reinforcement by no more than 0.3 mm after threading by knurling.

1.16. Not specified in the standards limit deviations sizes:

a) processed surfaces: diametrical - according to R12;

L12 other covering and covered surfaces - according to R14 ;. L14;

b) untreated surfaces of stamped reinforcement - according to table. 6;

c) "turnkey": for parts made by stamping and from round bars - by h 12, for parts made from hexagonal bars - equal to the maximum deviations of the "turnkey" size of the bar. The surfaces of turnkey bosses in stamped fittings are calibrated;

(Changed edition, Rev. No. 1, 2)

1.17. Unspecified radii from machining - -0.4 mm max. (for the instrument). "

1.18. Unspecified stamping radii - R 2.5 mm.

1.19. Stamping slopes - no more than 5 °.

1.20. Permissible displacement along the die parting plane - no more than 0.3 mm.

1.21. Thread metric; tolerance fields - according to GOST 16093-81: for external threads of steel parts - 6e; for external threads of parts made of aluminum alloy and bronze - 6h; for internal threads of parts - 5N6N. Runs (reduced), grooves and chamfers - according to GOSTT0549-80.

Notes:

K. When making a thread using the knurling method, lead-in chamfers must be made at an angle of 30 ° instead of 45 °.

2. Limit deviations of radii and chamfers in accordance with GOST 10549-80: ± 0.3 for sizes from 0.5 to 1 ash (iocl.) and ± 0.5 mm - for sizes from 1 to Zmm (incl.).

Tables a -6

Dimensions in mm

	Workpiece material
workpiece size		Aluminium alloy
workpiece size
	Previous off
A. Linear dimensions (except for rounding radii):


St. 16 to 25

St. 25 to 40

St. 40 to 60

St. 60 to 100
B* Dimensions of the radii of curvature:

(Changed edition, Rev. No. 1).

1.23. Allowed:

misalignment of the outer cylindrical surfaces and the hexagon - no more than half the tolerance for the turnkey size;

misalignment of external machined cylindrical surfaces and internal cylindrical surfaces - no more than half of the tolerance for internal diameters;

GOST 1E977-74 S. 15

on the inner surfaces of the through and intersecting holes of the reinforcement, the ledges from misalignment of the axes - no more

in all corners instead of roundings r = -^-perform

stepped ledges from the intersection of drilling holes;

in technically justified cases, in stamped fittings, obtain a turnkey size machining maintaining the required accuracy and surface roughness of at least class 4;

by agreement of the parties, the manufacture of reinforcement without holes for locking with wire, while adding the letters BK to the designation of the reinforcement, for example;

blunting of an incomplete thread of the connecting element of the reinforcement;

to improve the tightness of pipeline connections with D H > 16 mm, the sealing conical surfaces of coarse and fittings should be treated with surface roughness of the 8th class instead of the 7th.

(Revised edition, Rev. No. 2).

1.24. Dimensions and limit deviations for reinforcement must comply with those specified in the standards before coating

1.25. For parts intended for use in oxygen systems, in-symbol the letter K should be added, for example:

1.26. When using pipeline connections established by standards, it should be taken into account that the fatigue limit of a pipeline made of steel grade 12X18H10T with dimensions D„ Xs equal to 12x1 mm, determined at normal temperature, is o_1 \u003d 181 MN / m 2 (18.5 kgf / mm 2).

Note. Material. pipes - according to GOST 19277-73.

2. ACCEPTANCE RULES

2.1. To check the compliance of fittings, pipes and their connections with the requirements of this standard, acceptance tests are established.

2.2. Acceptance tests are subjected to each batch of fittings and pipes.

The batch must consist of parts of the same brand of material and the same standard size.

2.3. Acceptance tests are carried out in the following scope and sequence:

a) checking the dimensions of fittings and pipes and checking the fit of conical surfaces - 3% of the lot, but not less than 10 pieces;

b) determination of the wall thickness at the edge of the flared part of the pipe - 2% of the batch, but not less than 10 pieces;

c) checking the angle of distortion of the flared part of the pipe relative to the axis of the pipeline - 2 pcs. from the party;

d) checking the condition of the inner surface of the pipe - complete control; .

e) tests for strength and tightness of pipes - continuous control; .

f) external inspection of fittings and pipes - complete control;

g) determination of hardness -10% of the batch;

h) coating control - 1% of the batch, but not less than 3 pcs.

2.4. If during the testing of fittings and pipes (clauses 2.3a, b, c, g, h) unsatisfactory results are obtained in at least one of the indicators, the entire batch is returned for revision.

If during testing of fittings and pipes (clauses 2.3 d, e, f) parts are found that do not meet the requirements of this standard, these parts are returned for revision.

Repeated tests according to p.p. 2.3a, b, c, h are carried out on a double sample, according to p.p. 2.3 d, e, f, g - on each detail.

The results of the retests are final.

2.5. The consumer conducts quality control of the received product

induction in the scope and sequence of acceptance tests. .

2.6. stigma technical control must be applied by impact on each fit part (on the edges of a hexagon or on turnkey sites, except for parts whose stamping place is indicated on the drawings). It is allowed to stamp thin-walled or small-sized parts with paint or on a tag for the entire batch of parts.

3. TEST METHODS

3.1. The control of the dimensions of fittings and pipes is carried out universally. measuring tool. Thread inspection should be carried out prior to coating.

(Revised edition, Rev. No. 1).

3.2. The test of the outer conical surfaces of the reinforcement for fit is carried out using a special gauge according to the imprint of paint on the cone of the reinforcement.

The imprint must be annular, without a break and located in a plane perpendicular to the axis of the cone.

3.3. Tests of the inner conical surfaces of pipes for fit are carried out using a special gauge according to the paint imprint on the gauge cone, while the union nut must be tightened with the operating torque according to Table. 5. The imprint must be annular, without a gap. Internal test circuit tapered surface pipes to fit using a special gauge is shown in the drawing.

It is allowed not to check the paint imprint of the conical surfaces of fittings and pipes when checking connections for tightness with hydraulic or air pressure with tightening the union nut with the working torque according to Table. 5.

3.4. The wall thickness control at the edge of the flared part of the pipe is carried out according to the technical documentation approved in the prescribed manner.

3.5. The angle of skew of the flared part of the pipe relative to the axis of the pipeline is checked with a universal measuring tool.

3.6. Checking the internal surfaces of the pipes for the absence of foreign objects, dents and sags is carried out by rolling the ball.

3.7. Strength and tightness tests are carried out according to the technical documentation approved in the prescribed manner.

3.8. External inspection of fittings and pipes is carried out visually. The surface of the pipes under the nipple in the absence of displacement of the nipple is checked by cutting two pipes from the batch.

3.9. Hardness control is carried out on devices for measuring hardness according to the Rockwell and Vickers methods in accordance with GOST 23677-79.

EVIL. The control of coatings is carried out according to the technical documentation approved in the prescribed manner.

4. MARKING, PACKAGING, TRANSPORT AND STORAGE

4.1. Each part, except for nuts according to GOST 13958-74 and plugs then GOST 13974-74, must be marked containing:

values of outer diameters of pipes;

S. 18 GOST 13V77-74

conditional designation of the material grade.

4.5. When transporting parts to countries with a tropical climate, packaging and preservation are carried out in accordance with GOST 9.014-78.

4.6. Parts must be transported in clean and dry covered vehicles that protect them from precipitation and mechanical damage.

4.7. Parts must be stored in the packaging provided for by this standard, on racks in light (L) storage conditions in accordance with GOST 9.014-78.

APPENDIX J

EXAMPLES OF ASSEMBLING PIPES AND FITTINGS

1. Examples of assembling pipes and fittings are shown in Fig. 1-10.

Assembly of pipes with a straight pass

Assembly of pipes with an elbow

table 2

Type of semi-finished product	Material Grade
			For products general use	Assortment
	12X18H10T (X18H10T)

		Pipes of increased accuracy in accordance with GOST 9567-75
		See reference appendix 2

Bars for nipples, union nuts, nuts, bushings, adapters, plugs, plugs, caps		See reference appendix 2		Bars of normal accuracy in accordance with GOST 2590-71 Bars of the 5th accuracy class according to GOST 8560-7® and GOST 7417 - -75

	14X17H2 (1X17H2)
	12Х18Н9Т (Х18Н9Т)
	13X11N2V2MF (1Х12Н2ВМФ)			Bars of the 4th accuracy class according to GOST 8560-78 and GOST 7417 - -75

Assembly of pipes with a direct sealable penetration


	Hexagonal bars of the 5th and round 9th accuracy classes according to GOST 1628-78
Punching for elbows, tees, crosses		Holy reference appendix 2	GOST 105Q-74
	12Х18Н9Т (Х18Н9Т)
	13X11N2V2MF (1X12N2VMF)

	Br.AZHMTsYu-3-1.5			Round bars of the 9th accuracy class according to GOST 1628-78

Continuation of the table. 2

Type of semi-finished product	Material Grade	Technical documentation for semi-finished products
		For basic products	For general purpose products	Assortment
Washer sheets	D1ATV, D16ATV	See reference appendix* 2
	D1AT, D16AT
	12X18H10T (X18H10T)	See reference appendix 2

Notes:

1. 45 steel turning bars should be shipped in normalized condition.

2. For products of general use, replacement of materials is allowed:

steel grade 45 steel ZOHGSA - according to GOST 4543-71;

steel grade 45 (stamping) and aluminum alloy grade. AKv aluminum alloy grade AK4-1 according to GOST 21488--76; aluminum alloy grade D16T aluminum alloy grades AK4-1T1 in accordance with GOST 21488-76 and AK4-1chT1 according to the technical documentation specified in help application 2 (except union nuts) ;

steel grade 13HPN2V2MF steel grade YUHPNYZTZMR (Kh12N22TZMR) and steel grade 12X18N9T steel grade 12X18H10T according to GOST 5949-75. In case of replacement of materials in symbol reinforcement, the corresponding designation of the grade of the substitute material must be indicated,

(Revised edition, Rev. No. I, 2).

1.3. Symbols for reinforcement materials for pipeline connections must correspond to those indicated in Table. 3

Table 3

Material group	Designation	Material Grade	Material grade symbol
Material group	Designation	Material Grade	for basic products	for general purpose products
Stainless steel		13X11N2V2MF (1Х12Н2ВМФ)
		14X17N2 (X17N2, EI268)
		12X18H9T (X18H9T) I2X18H10T (X18H1GT)
		10X11H23T3MP (EPZZ)
		1H16N2AM (EP479)
Alloy and carbon steels
Alloy and carbon steels
Aluminum alloys		D16T, D1ATV, D16ATV, D1AT, D16AT, AK6
Aluminum alloys
		Br. AZHMTsYu-3-1.5

1.4. The working pressures inside the pipeline, depending on the material, diameter and wall thickness of the pipes, are given in Table 4.

1.5. Specified in table. 4 working pressures "P slave are determined at a temperature of plus 20 ° C; they are reference and are calculated by the formula

Rrab. = Pjtl>

where P is the minimum breaking pressure in MPa (kgf / cm?) Ha - safety margin equal to 3.15.

The minimum breaking pressure is determined by the formula:

where d is the inner diameter of the pipeline; S.- minimum

wall thickness in mm; and in - tensile strength of pipes in MN / m 2.

Outside diameter pipes D	material	Wall thickness, s

Continuation of the table. four

Dimensions in mm

Pipe outside diameter D	material	Wall thickness, s

		Operating pressure in MPa (kgf/cm*)

continuation of the table. four

Dimensions in mm

Pipe outside diameter D	material	Wall thickness, s

		Working pressure in MPA (kgf / cm 2)

Continuation of the table. four

Dimensions in mm

Pipe outside diameter	Brand ’material	Wall thickness, s

		Working pressure in MPa (kgf / cm?)

S. 10 GOST T3977-7D

(Changed edition, Rev. No. 1, 2).

Official publication Reprint prohibited

UDC 62t.643.4:006.354 Group G18

STATE STANDARD OF THE UNION OF THE SSR

PIPING CONNECTIONS ON THE OUTER CONE

GOST 13977-74*

Specifications

Tube connections on externa! cone Specifications

GOST 13977-72

By the Decree of the State Committee of Standards of the Council of Ministers of the USSR dated September 10, 1974 No. 2124, the deadline for the introduction is set

This standard applies to pipeline connections along the outer cone used in various liquid and gaseous media, including aggressive ones, at temperatures from minus 60 to plus 500 ° C and pressures up to 106 MPa (1060 kgf / cm 2), depending on materials of pipes and fittings on aircraft and their service facilities.

It is allowed to use these connections in other types of equipment, subject to the requirements of this standard.

Checked in 1985

Non-compliance with the standard is punishable by law

1. TECHNICAL REQUIREMENTS

Official edition

Reprint prohibited

* Reissue (January 1988) with Amendments No. 1, 2, approved in December 1980, January 1986 (IUS 3-81. 5-86)

Table 1

Reinforcement type	Material Grades	Permissible temperature
Reinforcement type	fittings	Permissible temperature
Conductors, adapters, elbows, tees, crosses, plugs, plugs, covers	(1Х12Н2ВМФ)
Nipples, union nuts, nuts
Pass-throughs, adapters, elbows, tees, crosses, washers, plugs, covers

Cap nuts, nuts, passages, adapters, elbows, tees, crosses, plugs, plugs, covers


Nuts, union nuts, passages, adapters, plugs, plugs, covers
	45, ZOHGSA
Elbows, tees, crosses

Nipples, union nuts, nuts
Pipes, adapters, coal nils, tees, crosses	Br.AZHMTsYU-3 -1.5

1.2. The material for pipes and fittings must comply with the technical documentation specified in Table. 2.

table 2

Type of semi-finished product	Material Grade
			For general purpose products	Assortment
	12X18H10T (X18H10T)	GOST 19277-73	GOST 9941-81

			GOST 8733-74	Pipes of increased accuracy in accordance with GOST 9567-75
		See reference appendix 2		Pipes according to GOST 18475-82
				Soft copper pipes according to GOST 617-72
Bars for nipples, union nuts, nuts, bushings, adapters, plugs, plugs, caps		See reference appendix no. 2	GOST 1051-73	Bars of normal accuracy in accordance with GOST 2590-71 Bars of the 5th accuracy class according to GOST 8560-^78 and GOST 7417--75
			GOST 4543-71
	14X17H2 (1X17H2)		GOST 5949-75
	12Х18Н9Т (Х18Н9Т)
	13X11N2V2MF (1Х12Н2ВМФ)			Bars of the 4th accuracy class according to GOST 8560-78 and GOST 7417--75

GOST 13977-74 C.

Type of semi-finished product	Material Grade	Technical documentation for semi-finished products
		For basic products	For general purpose products	Assortment
Bars for union nuts, nuts, passages, plugs, adapters, plugs, covers		increased accuracy
	Br.AZhMts 10-3-1.5	GOST 1628-78		Hexagonal bars of the 5th and round 9th accuracy classes according to GOST 1628-78
		St. reference application no. 2	GOST 105Q-74
	12Х18Н9Т (Х18Н9Т)		GOST 5949-75
	13X11N2V2MF (1X12N2VMF)

	BRAZHMTsYu-3-1.5	GOST 1628-78		Round bars of the 9th accuracy class according to GOST 1628-78

4 GOST 13977-74

Notes.

1. 45 steel turning bars should be shipped in normalized condition.

2. For products of general use, replacement of materials is allowed:

steel grade 45 steel ZOHGSA - according to GOST 4543-71;

steel grade 45 (stamping) and aluminum alloy grade AK6 aluminum alloy grade AK4-1 according to GOST 21488-76; aluminum alloy grade D16T aluminum alloy grades AK4-1T1 according to GOST 21488-76 and AK4-1chT1 according to the technical documentation specified in reference Appendix 2 (except for union nuts);

steel grade 13X11H2V2MF steel grade 10X11ShZTZMR (X12H22TZMR) and steel grade 12X18H9T steel grade 12X18H10T according to GOST 5949-75. In case of replacement of materials, the designation of the fittings must indicate the corresponding designation of the grade of the material-substitute

(Changed edition, Rev. No. 1,2).

GOST 13977-74 C.

1.3. Symbols for reinforcement materials for pipeline connections must correspond to those indicated in Table. 3

Table 3

Material group	Designation	Material Grade	Material grade symbol
Material group	Designation	Material Grade	for basic products	for general purpose products
Stainless steel		13X11N2V2MF (1Х12Н2ВМФ)
		14X17N2 (X17N2, EI268)
		12X18H9T (X18H9T) 12X18H10T (X18H1GT)
		10X11H23T3MP (EPZZ)
		1H16N2AM (EP479)
Alloy and carbon steels
Alloy and carbon steels
Aluminum alloys		D16T, D1ATV, D16ATV, D1AT, D16AT, AK6
Aluminum alloys
		Br. AZHMTsYu-3-1.5

1.4. The working pressures inside the pipeline, depending on the material, diameter and wall thickness of the pipes, are given in Table. four.

1.5. Specified in table. 4 operating pressures P slave determined at a temperature of plus 20°C; they are reference and are calculated by the formula

Rrab “1G ~ PI

where P is the minimum breaking pressure in MPa (kgf / cm 2) p is a safety margin equal to 3.15.

The minimum breaking pressure is determined by the formula:

where d is the inner diameter of the pipeline; S is the minimum wall thickness in mm; about in - tensile strength of pipes in MN / m 2.

Table 4

Dimensions in mm

Pipe outside diameter D	material	Wall thickness, s

		Working pressure in MPA (kgf / cm 2)

GOST 13977-74 S. 9

Pipe outside diameter D	material	Wall thickness, s

		Working pressure in MPa (kgf/cm*)

8 GOST 13977-74

Pipe outside diameter D	material	Wall thickness, s

		Working pressure in MCA (kgf / cm 2)

GOST 1EYu7-74 C

Pipe outside diameter	material	Wall thickness, s

		Working pressure in MPa (kgf/cm*)

and~££W IDOJ 01

Kb. The working and maximum allowable tightening torques of union nuts, pipeline connections made of steel grades 20A, 12X18H10T and aluminum alloy when testing them for tightness with hydraulic or air pressure must correspond to those indicated in Table. 5.

Tab 1 and tsa 5

Tightening torques, N * m (kgf-cm), for pipes made of
steel grades 20 A and 12X18Y0T		aluminum alloy
	Maximum admissible		Maximum admissible
	Maximum admissible		Maximum admissible

Note. Tightening union nuts for connections for which no torque values are specified, to be done with wrenches in accordance with GOST 2839-80 and GOST 2841-80

1.2-1.6.

1.7. Tightening of union nuts of pipeline connections during assembly on products is carried out with keys in accordance with GOST 2839-80 or GOST 2841-80.

The union nuts for critical connections are tightened with calibrated wrenches.

1.8. Fittings for pipeline connections must be heat-treated:

parts made of ZOHGSA grade steel for 29.0 h-35.5 NNS E;

nipples and nuts made of steel grade 14X17H2 by 23.0-^32.0 HRC 9; parts made of steel grade 13Kh11N2V2MF for 25.0n-35.0 HRC 3; parts made of steel grade 12X18H9T and 12XI8H10T are hardened; hot-forged parts made of aluminum alloys are hardened and aged according to T or T1 modes;

stamped parts made of steel grade 45 are normalized; parts made of steel grade 10X11H23T3MP for HRC 3 >32.0; parts made of steel grade 1X16H2AM by 25.0 ^ 35.0 HRC 3; parts with unspecified heat treatment must have mechanical properties corresponding to the original material. (Revised edition, Rev. No. 2).

1.9. Fittings for pipeline connections must have the following protective coatings in accordance with GOST 9.306-85:

From stainless steel and bronze - Chem. Pass.;

From carbon and alloy steel: with internal thread - Kdb-9. Chem. ok. Phos. gfzh; with external thread - Kd9-12Khim.oks.fos.gfzh and without thread - Kd15.hr.;

From aluminum alloys - An.Ox.hr.

Union nut 12-13-M GOST 13957-74.

Other types of coatings that improve the screwing are allowed.

For fittings in contact with fuel, cadmium plating must be replaced by zinc plating with the same coating thickness, while the letter C is entered into the designation of fittings, for example:

Cover 12-22-C GOST 13976-74.

Cover 12-22-0 GOST 13976-74.

Coating technology - according to technical documentation, approved in the prescribed manner.

(Changed edition, Rev. No. 1, 2).

1.10. Fittings made of aluminum alloys may be subjected to color anodizing in colors corresponding to the color marking of pipelines.

1.11. Additional protective coatings of reinforcement should be assigned in accordance with the technical documentation approved in the prescribed manner.

1.12. By agreement of the parties is allowed; do not cadmium (do not galvanize) the sealing conical and inner cylindrical surfaces of the connecting fittings that are in contact with the working fluid; replacement of cadmirsvania (zinc plating) with Khim.oks.fos.gfzh coating for the screw-in part of screw-in fittings; lack of hydrophobization of parts. In this case, respectively, the letters U, V, G are entered into the designation of the reinforcement.

(Revised edition, Rev. No. 2).

1.13. Cracks, captivity, burrs, risks, dents and other mechanical damage are not allowed on the surface of the reinforcement.

1.14. The thread must be clean and free of burrs, broken threads and dents.

1.15. Allowed:

a) thread marks on the surface of the centering collar and on the unmachined surfaces of elbows, tees and crosses;

b) minor dents and traces of stamps - no more than half of the maximum deviations for the corresponding size of the reinforcement;

c) surface defects allowed by the technical specifications for the bars from which the parts are made;

d) on the outer cylindrical surfaces of the cap nuts, untreated places (flats);

e) an increase in the diameter of the centering belt of the reinforcement by no more than 0.3 mm after threading by knurling.

1.16. Limit deviations of dimensions not specified in the standards:

a) surfaces to be treated: diametrical - according to #12; /g 12 other covering and covered surfaces - according to #14; h 14;

b) untreated surfaces of stamped reinforcement - according to table. 6;

c) "turnkey": for parts made by stamping and from round bars - according to #12, for parts made from hexagonal bars - equal to the maximum deviations of the "turnkey" size of the bar. The surfaces of turnkey bosses in stamped fittings are calibrated;

d) angular - according to GOST 8908-81 ±

(Changed edition, Rev. No. 1, 2)

1.17. Unspecified radii from machining -^ -0.4 mm max. (for the instrument).

1.18. Unspecified stamping radii - R 2.5 mm.

1.19. Stamping slopes - no more than 5 °.

1.20. Permissible displacement along the die parting plane - no more than 0.3 mm.

Table 6

Dimensions in mm

	Workpiece material
Workpiece size		aluminum alloy and bronze
	Previous off
A. Linear dimensions (except for rounding radii);


St. 16 to 25

St. 25 to 40

St. 40 to 60

St. 60 to 100
B Dimensions of radii of curvature:

(Changed edition, Rev. No. 1).

1.22. Tapered thread- according to GOST 6111-52.

1.23. Allowed:

misalignment of the outer cylindrical surfaces and the hexagon - no more than half the tolerance for the turnkey size;

misalignment of external machined cylindrical surfaces and internal cylindrical surfaces - no more than half of the tolerance for internal diameters;

on the inner surfaces of the through and intersecting holes of the reinforcement, the ledges from misalignment of the axes - no more than 0.2 mm;

in all gons instead of rounding r == -^-perform

stepped ledges from the intersection of drilling holes;

in technically justified cases, in stamped fittings, obtain a “turnkey” size by machining while maintaining the required accuracy and with a surface roughness of at least class 4;

by agreement of the parties, the manufacture of reinforcement without holes for locking with wire, while adding the letters BK to the designation of the reinforcement, for example:

Nut N120X1.5-ZGBK GOST 13958-74;

blunting of an incomplete thread of the connecting element of the reinforcement;

to improve the tightness of pipeline joints with D H > 16 mm, the sealing conical surfaces of pipes and fittings should be treated with surface roughness of the 8th class instead of the 7th.

(Revised edition, Rev. No. 2).

1.24. Dimensions and limit deviations for reinforcement must comply with those specified in the standards before coating

1.25. For parts intended for use in oxygen systems, the letter K must be added to the symbol, for example:

Lid 12-31-K GOST 13976-74

1.26. When using pipeline connections established by standards, it should be taken into account that the endurance limit of a pipeline made of steel grade 12X18H10T with dimensions D H Xs equal to 12x1 mm, determined at normal temperature, is o-z -181 MN / m 2 (18.5 kgf / mm 2) .

When I echan. Material tr y 5y - according to GOST 19277-73.

(Revised edition, Rev. Ml).

2. ACCEPTANCE RULES

2.1. To check the compliance of fittings, pipes and their connections with the requirements of this standard, acceptance tests are established.

2.2. Acceptance tests are subjected to each batch of fittings and pipes.

The batch must consist of parts of the same brand of material and the same standard size.

2.3. Acceptance tests are carried out in the following scope and sequence:

a) checking the dimensions of fittings and pipes and checking the fit of conical surfaces - 3% of the lot, but not less than 10 pieces;

b) determination of the wall thickness at the edge of the flared part of the pipe - 2% of the batch, but not less than 10 pieces;

c) checking the angle of distortion of the flared part of the pipe relative to the axis of the pipeline - 2 pcs. from the party;

d) checking the condition of the inner surface of the pipe - complete control;

e) tests for strength and tightness of pipes - continuous control;

f) external inspection of fittings and pipes - complete control;

g) determination of hardness - 10% of the batch;

h) control of coatings - 1% of the lot, but not less than 3 pcs.

2.4. If during the testing of fittings and pipes (clauses 2.3a, b, c, g, h) unsatisfactory results are obtained in at least one of the indicators, the entire batch is returned for revision.

If during testing of fittings and pipes (clauses 2.3 d, e, f) parts are found that do not meet the requirements of this standard, these parts are returned for revision.

Repeated tests according to p.p. 2.3a, b, c, h are carried out on a double sample, according to p.p. 2.3 d, e, f, g - on each detail.

The results of the retests are final.

2.5. The consumer carries out quality control of incoming products in the scope and sequence of acceptance tests.

2.6. The stamp of technical control must be applied by impact on each suitable part (on the edges of a hexagon or on turnkey sites, except for parts whose stamping place is indicated on the drawings). It is allowed to stamp thin-walled or small-sized parts with paint or on a tag for the entire batch of parts.

3. TEST METHODS

3.1. Control of the dimensions of fittings and pipes is carried out with a universal measuring tool. Thread inspection should be carried out prior to coating.

(Revised edition, Rev. No. 1).

3.2. The test of the outer conical surfaces of the reinforcement for fit is carried out using a special gauge according to the imprint of paint on the cone of the reinforcement.

The imprint must be annular, without a break and located in a plane perpendicular to the axis of the cone.

3-3. Tests of the inner conical surfaces of pipes for fit are carried out using a special gauge according to the paint imprint on the gauge cone, while the union nut must be tightened with the operating torque according to Table. 5. The imprint must be annular, without a gap. The scheme of testing the inner conical surface of the pipe for fit using a special gauge is shown in the drawing.

3.4. The wall thickness control at the edge of the flared part of the pipe is carried out according to the technical documentation approved in the prescribed manner.

3.5. The angle of skew of the flared part of the pipe relative to the axis of the pipeline is checked with a universal measuring tool.

3.6. Checking the internal surfaces of the pipes for the absence of foreign objects, dents and sags is carried out by rolling the ball.

3.7. Strength and tightness tests are carried out according to the technical documentation approved in the prescribed manner.

3.9. Hardness control is carried out on devices for measuring hardness according to the Rockwell and Vickers methods according to GOST 23677-79.

EVIL. The control of coatings is carried out according to the technical documentation approved in the prescribed manner.

4. MARKING, PACKAGING, TRANSPORT AND STORAGE

4.1. Each part, except for nuts according to GOST 13958-74 and plugs according to GOST 13974-74, must be marked with:

values of outer diameters of pipes;

/-special caliber. 2-pipe assembly in accordance with GOST 13954-74

conditional designation of the material grade.

Nuts in accordance with GOST 13958-74 and plugs in accordance with GOST 13974-74 are marked with a thread designation and a material grade symbol.

Marking is carried out by impact method on the faces of the hexagon or on turnkey platforms, except for the parts whose marking place is indicated on the drawings. For stamped fittings, marking can be applied during stamping on the body of the part (except for turnkey sites) in raised font > Font - in accordance with GOST 2930-62. Font depth at shock method marking - no more than 0.3 mm. Bronze fittings are not marked by material.

For parts subjected to galvanizing, and for parts intended for use in oxygen systems, the letters C and K, respectively, must be added to the marking text.

For parts made from hexagonal bars, it is allowed to preliminarily apply the marking text on the faces of the hexagon of the bars by a continuous method, while the presence of repeating markings on the faces of the parts is allowed.

It is allowed to mark thin-walled and small-sized parts with paint or on a tag for the entire batch of parts.

4.2. Each part is wrapped in anti-corrosion paper according to GOST 16295-82 and packed in plank boxes of type I according to GOST 2991-85, lined inside with waterproof paper according to GOST 8828-75. Packaging must ensure the safety of the packed parts during transportation by any means of transport.

Details intended for oxygen systems are wrapped in vegetable parchment according to GOST 1341-84. The use of lubricants and oiled wrapping material is not allowed.

Each box contains parts of only one name.

Gross not more than 32 kg.

4.3. Each box contains a passport and a packing list, which indicate:

name or trademark manufacturer;

conditional designation of the part;

number of details;

date of manufacture;

lot number;

designation of this standard.

4.4. Shipping container marking - in accordance with GOST 14192-77.

4.5. When transporting parts to countries with a tropical climate, packaging and preservation are carried out in accordance with GOST 9.014-78.

4.6. Parts must be transported in clean and dry covered vehicles that protect them from atmospheric precipitation and mechanical damage.

4.7. Parts must be stored in the packaging provided for by this standard, on racks in light (L) storage conditions in accordance with GOST 9.014-78.

APPENDIX J

EXAMPLES OF ASSEMBLING PIPES AND FITTINGS

1" Examples of pipe assembly and fittings are shown in Fig. 1-10.

Assembly of pipes with a straight pass

pipe assembly according to GOST 13954-74; 2 straight through passage according to GOST 13959-74; 3-wire; 4-seal.

Assembly of pipes with an elbow

J-pipe assembly according to GOST 13954-74; 2-gon pass

Noah according to GOST 13962-74; 3- filling; 4-wire.

/-pipe assembly according to GOST 13954-74; 2-way straight sealed according to GOST 20188-74, 3-washer according to GOST 20193-74; four-

wire, 5-seal, €-nut according to GOST

13958-74 7-gasket seal

Assembly of pipes with a flanged sealable elbow

1 pipe assembly according to GOST 13954-54; 2-

angle flange through passage sealed in accordance with GOST 20189-74; 3-nut according to GOST 13958-74; 4-sealing gasket; 5-

washer according to GOST 20193-74; b-seal; 7-wire.

/-pipe assembly according to GOST 13954-74; screw-in 2-angle according to GOST 13969-74, 3-wire; 4-seal

Assembly of pipes with a plunged elbow

/-pipe assembly in accordance with GOST 13954-74, 2-angle

screw-in according to GOST 13970-74, 3-wire, 4-seal.

1 pipe assembly according to GOST 13954 -74; 2- screw-in passage for a metal seal according to GOST 5 0194-74, 3- sealing ring; 4-wire, 5-seal

Rough assembly with screw-in bushing under rubber seal

/-pipe assembly according to GOST 13954-74; 2-passages to the screw-in for rubber sealed not according to GOST 20195-74; 3- sealing ring according to GOST 9833-73; 4- wire; 5-seal

/ -pipe assembly according to GOST 13954-74, screw-in 2-angle for rubber

seal according to I OST 20198-74, 3-nut according to GOST 19532-74, 4-washer according to

GOST 19531-74, 5-ring seal

body according to GOST 9833-73, 6-seal, 7-wire.

Assembling the lid with fittings

1-threaded part of the reinforcement according to GOST 13955-74; 2-cap nut according to GOST 13957-74; 3-lid according to GOST 13976-74; 4-suspension; 5-

seal; 6-wire.

2. Sealing gaskets, rings and sockets, respectively, for flanged and screw-in parts for a metal seal and instructions for their installation - according to the documentation approved in the prescribed manner.

Sockets for screw-in parts for rubber sealing and instructions for their installation - according to GOST 19529-74 and GOST 19528-74.

3. When assembling pipelines, it is recommended to lubricate the threads of the parts with grease, if this does not contradict the requirements for the system or the product. The type of lubricant is determined by the product developer, based on its purpose and operating conditions of the system.

4. Parts intended for use in oxygen systems must be degreased before assembly.

5. For locking, it is necessary to use a wire with a diameter of 0.8-1.2 mm. The wire must be twisted, kept under tension and protected threaded connections from self-loathing. Breaks and flattening of the wire are not allowed.

The seals must be pressed against some surface, and the ends of the wire must be bent and pressed against the seal. Wire fastening in assemblies according to fig. 3-5 and 7, 8, 10 in order to ensure the locking of connections to any fixed element of the structure, or to a special eye or hole.

The brand of wire, the type of seal and the type of suspension of caps (plugs) are assigned by the product developer. At the discretion of the product developer, other types of locking are allowed, as well as the absence of locking and sealing.

APPENDIX 2 Reference

TECHNICAL DOCUMENTATION FOR SEMI-FINISHED PRODUCTS FOR MAIN PURPOSE PRODUCTS

Type of semi-finished product	Material Grade	Technical documentation
		OST 1 90038-1
Rods for nipples, union nuts, nuts, bushings, adapters*, plugs, plugs, caps		TU 14-1-2330-77
		TU 14-1-950-74
	14X17H2 (1X17H2)	TU 14-1-378-72 TU 14-1-377-72
	I2X18H9T (1X18H9T)	TU 14-1-378-72 TU 14-1-377-72
	13X11N2V2MF (1X12N2VMF)	TU 14-1-3297-82 TU 14-1-1791-76
Punching for elbows, tees, crosses		OST 1 90085-7S, group 3
		OST 1 90176-75, group 3
	13X11N2V2MF (1X12N2VMF)	OST 1 90176-75, group 3
		OST 1 90073-72, group 3
Washer sheets	D1ATV. D16ATV	OST 1 90070-72
Washer sheets		TU 14-1-2186-77
Bars for nuts, bushings, adapters, plugs, plugs, covers	AK4-1T1 AK4-1chT1	GOST 21488-76 OST 1 90174-75

Notes:

1. It is allowed to replace materials - steel grade 45 with steel grade ZOHGSA TU 14-1-950-74 (bars) and OST 1 90085-73 (stampings); steel grade 45 (stamping) and aluminum alloy grade AK6 aluminum alloy grade AK4-1 according to OST 1 90073-72; steel grade 12X13H9T steel grade 12X18H10T; steel grade 13X11H2V2MF steel grade 10X11H23T3MP (X12H22TZMR) according to TU 14-1-378-72, TU 14-1-312-72; steel grade 13Kh11N2V2MF steel grade 1Kh16N2AM (EP479) according to TU 14-1-948-74 and TU 14-1-3575-83. In the case of replacement of materials, the designation of the fittings must indicate the corresponding designation of the grade of the material-substitute.

2. The assortment is indicated in table. 2 GOST 13977-74.

(Changed edition, Rev. No. 1, 2)

Enacted by the Decree of the State Committee for Standards of the Council of Ministers of the USSR of September 10, 1974 N 2124

Interstate standard GOST 13977-74

"PIPELINE CONNECTIONS ON THE OUTER CONE. SPECIFICATIONS"

Tube connections on external cone. Specifications

Instead of GOST 13977-72

It is allowed to use these connections in other types of equipment, subject to the requirements of this standard.

1. Technical requirements

Table 1

Reinforcement type	Material Grades		Permissible temperature in °С
Reinforcement type	fittings		Permissible temperature in °С
Pipes, adapters, elbows, tees, crosses, plugs, plugs, covers	13X11N2V2MF (1X12N2VMF)	12X18H10T (X18H10T)
Nipples, union nuts, nuts	14X17H2 (1X17H2)
Pipes, adapters, elbows, tees, crosses, washers, plugs, covers	12Х18Н9Т (Х18Н9Т)
	12X18H10T (X18H10T)
Cap nuts, nuts, passages, adapters, elbows, tees, crosses, plugs, plugs, caps





Nuts, union nuts, passages, adapters, plugs, plugs, covers

Elbows, tees, crosses




Nipples, union nuts, nuts	14X17H2 (1X17H2)
Pipes, adapters, elbows, tees, crosses	Br.AZhMts10-3-1, 5

1.2. The material for pipes and fittings must comply with the technical documentation specified in Table. 2.

table 2

Type of semi-finished product	Material Grade	Technical documentation for semi-finished products
		For basic products	For general purpose products	Assortment
	12X18H10T (X18H10T)	GOST 19277-73	GOST 9941-81

			GOST 8733-74	Pipes of increased accuracy in accordance with GOST 9567-75
		See annex 2		Pipes according to GOST 18475-82
				Soft copper pipes according to GOST 617-90
		See annex 2	GOST 1051-73	Bars of normal accuracy in accordance with GOST 2590-88
			GOST 4543-71
	14X17H2 (1X17H2)		GOST 5949-75	Bars of the 5th accuracy class according to GOST 8560-78 and GOST 7417-75
	12Х18Н9Т (Х18Н9Т)
	13X11N2V2MF (1X12N2VMF)			Bars of the 4th accuracy class according to GOST 8560-78 and GOST 7417-75
Bars for union nuts, nuts, bushings, plugs, adapters, plugs, covers		21488-97 high precision
	Br.AZhMts 10-3-1, 5	GOST 1628-78		Hexagonal bars of the 5th and round 9th accuracy classes according to GOST 1628-78
		See annex 2	GOST 1050-88
	12Х18Н9Т(Х18Н9Т)		GOST 5949-75
	13X11N2V2MF (1X12N2VMF)

	Br.AZhMts 10-3-1, 5	GOST 1628-78		Round bars of the 9th accuracy class according to GOST 1628-78
Washer sheets	D1ATV, D16ATV	See annex 2
	D1AT, D16AT		GOST 21631-76
	12X18H10T (X18H10T)	See annex 2		According to GOST 19903-74, 19904-90
			GOST 5582-75, soft

Notes:

1. 45 steel turning bars should be shipped in normalized condition.

2. For products of general use, replacement of materials is allowed:

steel grade 45 steel 30HGSA - according to GOST 4543-71;

steel grade 45 (stamping) and aluminum alloy grade AK6 aluminum alloy grade AK4-1 according to GOST 21488-97; aluminum alloy grade D16T aluminum alloy grades AK4-1T1 in accordance with GOST 21488-76 and AK4-1chT1 according to the technical documentation specified in Appendix 2 (except for union nuts) and steel grade 13X11H2V2MF steel grade 10X11H23TZMR (X12H22TZMR) and steel grade 12X18H9T steel grade 12X18N GOST 5949-75. In the case of replacement of materials, the designation of the fittings must indicate the corresponding designation of the grade of the material-substitute.

1.3. Symbols for reinforcement materials for pipeline connections must correspond to those indicated in Table. 3.

Table 3

Material group	Group designation	Material Grade	Material grade symbol
Material group	Group designation	Material Grade	for basic products	for general purpose products
Stainless		13X11N2V2MF (1X12N2VMF)
		(X17N2, EI268)
		12Х18Н9Т (Х18Н9Т) 12X18H10T (X18H10T)
		10X11N23T3MR (EPZZ)
		1H16N2AM (EP479)
Alloy and carbon steels
Alloy and carbon steels
Aluminum alloys		D16T, D1ATV, D16ATV, D1AT, D16AT, AK6
Aluminum alloys
		Br.AZhMts10-3-1, 5

1.4. The working pressures inside the pipeline, depending on the material, diameter and wall thickness of the pipes, are given in Table. four.

Table 4

Dimensions in mm

Pipe outer diameter D H	Material Grade	Wall thickness, s

		Working pressure in MPA (kgf / cm 2)



	12X18H10T (X18H10T)



	12X18H10T (X18H10T)



	12X18H10T (X18H10T)



	12X18H10T (X18H10T)



	12X18H10T (X18H10T)



	12X18H10T (X18H10T)



	12X18H10T (X18H10T)



	12X18H10T (X18H10T)



	12X18H10T (X18H10T)


	12X18H10T (X18H10T)


	12X18H10T (X18H10T)


	12X18H10T (X18H10T)


	12X18H10T (X18H10T)


	12X18H10T (X18H10T)


	12X18H10T (X18H10T)


	12X18H10T (X18H10T)


	12X18H10T (X18H10T)

(Changed edition, Rev. N 1, 2).

1.5. Specified in table. 4 operating pressures P slave determined at a temperature of plus 20°C; they are reference and are calculated by the formula

R slave \u003d R / n,

where P is the minimum breaking pressure in MPa (kgf / cm 2);

n - margin of safety equal to 3, 15.

The minimum bursting pressure is determined by the formula

where d is the inner diameter of the pipeline;

S is the minimum wall thickness in mm.

1.6. The working and maximum allowable torques of tightening the union nuts of pipeline connections made of steel grades 20A, 12X18H10T and aluminum alloy when testing them for tightness with hydraulic or air pressure must correspond to those indicated in Table. 5.

Table 5

Pipe size D n × S, mm	Tightening torques, N m (kgf cm), for pipes made of
	steel grades 20A and 12X18H10T			aluminum alloy
			Maximum allowable			Maximum allowable
		Previous off	Maximum allowable		Previous off	Maximum allowable

Note. Tightening of union nuts for connections for which no torque values are specified should be done with wrenches in accordance with GOST 2839-80 and GOST 2841-80.

1.5, 1.6. (Changed edition, Rev. N 2).

1.7. Tightening of union nuts of pipeline connections during assembly on products is carried out with keys according to GOST 2839-80 or GOST 2841-80.

The union nuts for critical connections are tightened with calibrated wrenches.

1.8. Fittings for pipeline connections must be heat-treated:

parts made of steel grade 30KhGSA at 29.0-35.5 HRC e;

nipples and nuts made of steel grade 14X17H2 at 23.0-32.0 HRC e;

parts made of steel grade 13Kh11N2V2MF for 25.0-0.35 HRC e;

parts made of steel grade 12X18H9T and 12X18H10T are hardened;

hot-forged parts made of aluminum alloys are hardened and aged according to T or T1 modes;

stamped parts made of steel grade 45 are normalized;

parts made of steel grade 10Kh11N23T3MR for HRC e ≥32, 0;

parts made of steel grade 1X16H2AM for 25.0-0.35 HRC e;

parts with unspecified heat treatment must have mechanical properties corresponding to the original material.

(Changed edition, Rev. N 2).

1.9. Fittings for pipeline connections must have the following protective coatings:

From stainless steel and bronze - Chem. Pass.;

From carbon and alloy steel: with internal thread - Kd6-9. Chem. ox. Phos. gfzh; with external thread - Kd9-12. Chem. ox. Phos. gfzh and without thread - Kd15.hr.;

From aluminum alloys - An. Oks. ridge

To improve the screwing of threaded fittings made of stainless steels, the inner surfaces of the union nuts may be subjected to copper plating (for operating temperatures up to 300°C) or electrochemical phosphating with a thickness of 0.003-0.006 mm (for operating temperatures up to 500°C). In this case, the letters M or Ef are entered into the designation of the nut, respectively, for example:

Union nut 12-13-M GOST 13957-74.

Other types of coatings that improve the screwing are allowed.

For fittings in contact with fuel, cadmium plating must be replaced by zinc plating with the same coating thickness, while the letter C is entered into the designation of fittings, for example:

Lid 12-22-Ts GOST 13976-74

For parts made of carbon steels operating in oil, it is allowed to use the Chemical coating instead of cadmium plating. Oks. prm, while the letter O must be entered in the designation of parts, for example:

Lid 12-22-O GOST 13976-74

Coating technology - according to technical documentation, approved in the prescribed manner.

(Changed edition, Rev. N 1, 2).

1.10. Fittings made of aluminum alloys may be subjected to color anodizing in colors corresponding to the color marking of pipelines.

1.11. Additional protective coatings of reinforcement should be assigned in accordance with the technical documentation approved in the prescribed manner.

1.12. By agreement of the parties, it is allowed: not to cadmium (not zincate) the sealing conical and inner cylindrical surfaces of the connecting fittings that are in contact with the working fluid; replacement of cadmium (zinc plating) coating Chem. ox. Phos. gfzh for the screw-in part of the screw-in fittings; lack of hydrophobization of parts. In this case, respectively, in the designation of the reinforcement, enter the letters U, V, G.

(Changed edition, Rev. N 2).

1.13. Cracks, captivity, burrs, risks, dents and other mechanical damage are not allowed on the surface of the reinforcement.

1.14. The thread must be clean and free of burrs, broken threads and dents.

1.15. Allowed:

a) thread marks on the surface of the centering collar and on the unmachined surfaces of elbows, tees and crosses;

b) minor dents and traces of stamps - no more than half of the maximum deviations for the corresponding size of the reinforcement;

c) surface defects allowed by the technical specifications for the bars from which the parts are made;

d) on the outer cylindrical surfaces of the cap nuts, untreated places (flats);

e) an increase in the diameter of the centering belt of the reinforcement by no more than 0.3 mm after threading by knurling.

1.16. Limit deviations of dimensions not specified in the standards:

a) treated surfaces: diametrical - according to H12; h12; other covering and covered surfaces - according to H14, h14;

b) untreated surfaces of stamped reinforcement - according to table. 6;

c) "turnkey": for parts made by stamping and from round bars - according to h12; for parts made from hexagonal bars - equal to the maximum deviations of the "turnkey" size of the bar. The surfaces of turnkey bosses in stamped fittings are calibrated;

d) angular - according to GOST 8908-81.

(Changed edition, Rev. N 1, 2).

1.17. Unspecified radii from machining - no more than 0.4 mm (for a tool).

1.18. Unspecified stamping radii - R 2.5 mm.

1.19. Stamping slopes - no more than 5 °.

1.20. Permissible displacement along the die parting plane - no more than 0.3 mm.

1.21. Metric thread - according to GOST 9150-81; tolerance fields - according to GOST 16093-81; for external threads of steel parts - 6e; for external threads of parts made of aluminum alloy and bronze - 6h; for internal threads of parts - 5N6N. Runs (reduced), grooves and chamfers - according to GOST 10549-80.

Notes:

1. When making a thread using the knurling method, lead-in chamfers must be made at an angle of 30° instead of 45°.

2. Limit deviations of radii and chamfers according to GOST 10549-80 ±0.3 for sizes from 0.5 to 1 mm (excl.) and ±0.5 mm for sizes from 1 to 3 mm (incl.).

Table 6

Dimensions in mm

Workpiece size	Workpiece material
		Aluminum alloy and bronze
	Previous off
A Linear dimensions (except for rounding radii)


St. 16 to 25

St. 25 to 40

St. 40 to 60

St. 60 to 100

B. Dimensions of the radii of curvature

1.22. Tapered thread - according to GOST 6111-52.

1.23. Allowed:

Misalignment of the outer cylindrical surfaces and the hexagon - no more than half the tolerance for the "turnkey" size;

Misalignment of the outer machined cylindrical surfaces and inner cylindrical surfaces - no more than half of the tolerance for internal diameters;

On the inner surfaces of the through and intersecting holes of the reinforcement, the ledges from misalignment of the axes are not more than 0.2 mm;

In all squares, instead of fillets, perform stepped ledges from the intersection of the drilling holes;

In technically justified cases, in stamped fittings, obtain a turnkey size by machining while maintaining the required accuracy and with a surface roughness of at least class 4;

By agreement of the parties, the manufacture of reinforcement without holes for locking with wire, while adding the letters BK to the reinforcement designation, for example:

Nut M20X 1, 5-31-BK GOST 13958-74

Blunting of an incomplete thread of the connecting element of the reinforcement;

To improve the tightness of pipeline connections with D H ≥16 mm, the sealing conical surfaces of pipes and fittings should be treated with surface roughness of the 8th class instead of the 7th.

(Changed edition, Rev. N 2).

1.24. Dimensions and limit deviations for reinforcement must comply with those specified in the standards before coating.

1.25. For parts intended for use in oxygen systems, the letter K must be added to the symbol, for example

Lid 12-31-K GOST 13976-74

1.26. When using pipeline connections established by standards, it should be taken into account that the endurance limit of a pipeline made of steel grade 12X18H10T with dimensions D H ×s equal to 12x1 mm, determined at normal temperature, is σ -1 \u003d 181 MN / m 2 (18.5 kgf / mm 2) .

Note. Pipe material - according to GOST 19277-73.

2. Acceptance rules

2.1. To check the compliance of fittings, pipes and their connections with the requirements of this standard, acceptance tests are established.

2.2. Acceptance tests are subjected to each batch of fittings and pipes.

The batch must consist of parts of the same brand of material and the same standard size.

2.3. Acceptance tests produced in the following volume and sequence:

a) checking the dimensions of fittings and pipes and checking the fit of conical surfaces - 3% of the lot, but not less than 10 pieces;

b) determination of the wall thickness at the edge of the flared part of the pipe - 2% of the batch, but not less than 10 pieces;

c) checking the angle of distortion of the flared part of the pipe relative to the axis of the pipeline - 2 pcs. from the party;

d) checking the condition of the inner surface of the pipe - complete control;

e) tests for strength and tightness of pipes - continuous control;

f) external inspection of fittings and pipes - complete control;

g) determination of hardness - 10% of the batch;

h) coating control - 1% of the batch, but not less than 3 pcs.

2.4. If during the testing of fittings and pipes (clauses 2.3a, b, c, g, h) unsatisfactory results are obtained in at least one of the indicators, the entire batch is returned for revision.

If during testing of fittings and pipes (clauses 2.3 d, e, f) parts are found that do not meet the requirements of this standard, these parts are returned for revision.

Repeated tests according to p.p. 2.3a, b, c, h are carried out on a double sample, according to p.p. 2.3 d, e, f, g - on each detail.

The results of the retests are final.

2.5. The consumer carries out quality control of incoming products in the scope and sequence of acceptance tests.

3. Test methods

3.1. Control of the dimensions of fittings and pipes is carried out with a universal measuring tool. Thread inspection should be carried out prior to coating.

(Changed edition, Rev. N 1).

3.2. The test of the outer conical surfaces of the reinforcement for fit is carried out using a special gauge according to the imprint of paint on the cone of the reinforcement.

The imprint must be annular, without a break and located in a plane perpendicular to the axis of the cone.

3.3. Tests of the inner conical surfaces of pipes for fit are carried out using a special gauge according to the paint imprint on the gauge cone, while the union nut must be tightened with the operating torque according to Table. 5. The imprint must be annular, without a gap. The scheme of testing the inner conical surface of the pipe for fit using a special gauge is shown in the drawing.

3.4. The wall thickness control at the edge of the flared part of the pipe is carried out according to the technical documentation approved in the prescribed manner.

3.5. The angle of skew of the flared part of the pipe relative to the axis of the pipeline is checked with a universal measuring tool.

3.6. Checking the internal surfaces of the pipes for the absence of foreign objects, dents and influxes is carried out by rolling the ball.

3.7. Strength and tightness tests are carried out according to the technical documentation approved in the prescribed manner.

3.9. Hardness control is carried out on devices for measuring hardness according to the Rockwell and Vickers methods according to GOST 23677-79.

3.10. The control of coatings is carried out according to the technical documentation approved in the prescribed manner.

4. Marking, packaging, transportation and storage

4.1. Each part, except for nuts according to GOST 13958-74 and plugs according to GOST 13974-74, must be marked with:

values of outer diameters of pipes;

conditional designation of the material grade.

Nuts in accordance with GOST 13958-74 and plugs in accordance with GOST 13974-74 are marked with a thread designation and a material grade symbol.

Marking is performed by impact on the faces of the hexagon or on turnkey sites, except for parts whose marking place is indicated on the drawings. For stamped fittings, marking can be applied during stamping on the body of the part (except for "turnkey" pads) in raised type. Font - according to GOST 2930-62. The depth of the font with the impact method of marking - no more than 0.3 mm. Bronze fittings are not marked by material.

For parts subjected to galvanizing, and for parts intended for use in oxygen systems, the letters C and K, respectively, must be added to the marking text.

It is allowed to mark thin-walled and small-sized parts with paint or on a tag for the entire batch of parts.

4.2. Each part is wrapped in anti-corrosion paper according to GOST 16295-93 and packed in plank boxes of type I according to GOST 2991-85, lined inside with waterproof paper according to GOST 8828-89. Packaging must ensure the safety of the packed parts during transportation by any means of transport.

Details intended for oxygen systems are wrapped in vegetable parchment according to GOST 1341-97. The use of lubricants and oiled wrapping material is not allowed.

Each box contains parts of only one name.

Gross not more than 32 kg.

4.3. Each box contains a passport and a packing list, which indicate:

name or trademark of the manufacturer;

conditional designation of the part;

number of details;

date of manufacture;

4. Parts intended for use in oxygen systems must be degreased before assembly.

5. For locking, it is necessary to use a wire with a diameter of 0.8-1.2 mm. The wire must be twisted, be in a taut state and protect the threaded connections from self-unscrewing. Breaks and flattening of the wire are not allowed.

The seals must be pressed against some surface, and the ends of the wire must be bent and pressed against the seal. Wire fastening in assemblies according to fig. 3-5 and 7, 8, 10 in order to ensure the locking of the connections, make them to any fixed element of the structure or by a special eye or hole.

Appendix 2

Technical documentation for semi-finished products for basic products

Type of semi-finished product	Material Grade	Technical documentation
		OST 1 90038-71
Bars for nipples, union nuts, nuts, bushings, adapters, plugs, plugs, caps		TU 14-1-2330-77
		ChMTU 1-950-74
	14X17H2 (1X17H2)	TU 14-1-378-72;
	12X18H9T (1X18H9T)	TU 14-1-377-72
	13X11N2V2MF (1X12N2VMF)	TU 14-1-3297-82; TU 14-1-1791-76
Bars for nuts, bushings, adapters, plugs, plugs, covers		GOST 21488-97; OST 1 90174-75
Punching for elbows, tees, crosses		OST 1 90085-73, group 3
	12Х18Н9Т(Х18Н9Т)	OST 1 90176-75, group 3
	13X11N2V2MF (1X12N2VMF)	OST 1 90176-75, group 3
		OST 1 90073-72, group 3
Washer sheets	D1ATV, D16ATV	OST 1 90070-72
Washer sheets	12X18H10T (X18H10T)	TU 14-1-2186-77

Notes:

1. It is allowed to replace materials: steel grade 45 with steel grade 30KhGSA TU 14-1-950-74 (bars) and OST 1 90085-73 (stamping); steel grade 45 (stamping) and aluminum alloy grade AK6 aluminum alloy grade AK4-1 according to OST 1 90073-72; steel grade 12X18H9T steel grade 12X18H10T; steel grade 13Kh11N2V2MF steel grade 10Kh11N23T3MR (Kh12N22TZMR) according to TU 14-1-378-72, TU 14-1-312-72; steel grade 13Kh11N2V2MF steel grade 1Kh16N2AM (EP479) according to TU 14-1-948-74 and TU 14-1-3575-83. In the case of replacement of materials, the designation of the fittings must indicate the corresponding designation of the grade of the material-substitute.

2. The assortment is indicated in table. 2 GOST 13977-74.

(Changed edition, Rev. N 1, 2).

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STATE STANDARD OF THE UNION OF THE SSR

Checked in 1985

Non-compliance with the standard is punishable by law

1. The design and dimensions of the flared ends of the pipes must correspond to those indicated in Fig. 1 and in table. one.

* Size provide tool

Note. It is allowed to use pipes made of steel grade 12X18H10T with a diameter D H1 , exceeding the upper deviation of the tolerance field d 9, while the diametrical tightness of the nipple on the pipe should not exceed 0.16 mm.

* Size for reference.

Table 1

Dimensions in mm


	Limit deviations

2 , 3. (Changed edition, Rev. No. 1, 2).

4. When expanding pipes into a nipple, the radius r control only on the lower deviation.

5. For pipes made of steel grades 20A and 20, subjected to sandblasting, the roughness parameter of the inner surface of the cone of the flared part should be no more than Ra 2.5 µm GOST 2789-73.

6. Longitudinal and ring marks, scratches, nicks and cracks are not allowed on the inner surface of the cone of the flared part of the pipe.

7. The depth of impressions from dies (nipples) and longitudinal marks on the outer surface of the cone of the flared part of the pipe should not exceed 0.03 mm, but should not go beyond the tolerance for wall thickness.

The depth of imprints from matrices (nipples) on the remaining outer surfaces of the pipes should not go beyond the tolerance for wall thickness.

8. The transition of the inner conical surface of the flared part of the pipe into a cylindrical one must be smooth, without a transverse annular influx. A sharp transition is allowed without the formation of an annular influx.

For aluminum alloy pipes with D n? 10 mm, a slight overflow is allowed.

The transition of the inner and outer conical parts to the cylindrical during calibration should be smooth.

Note. Removal by cutting of the annular overflow at the transition of the inner conical surface of the flared part of the pipe to the cylindrical part is not allowed.

9. The edge of the cone of the flared part of the pipe should not have cracks, burrs and should be rounded.

10. The wall thickness at the edge of the conical flared part of the pipe should not be less than 70% of the wall thickness of the cylindrical part of the pipe. For aluminum alloy pipes with D n 8 mm wall reduction up to 55 - 60% is allowed.

Dimensions in mm

	Material Grade	Wall thickness, S

		Weight 1 m, kg



	12X18H10T (X18H10T)




	12X18H10T (X18H10T)




	12X18H10T (X18H10T)




	12X18H10T (X18H10T)




	12X18H10T (X18H10T)




	12X18H10T (X18H10T)




	12X18H10T (X18H10T)




	12X18H10T (X18H10T)




	12X18H10T (X18H10T)



	12X18H10T (X18H10T)



	12X18H10T (X18H10T)



	12X18H10T (X18H10T)



	I2X18H10T (X18H10T)



	12X18H10T (X18H10T)



	12X18H10T (X18H10T)



	12X18H10T (X18H10T)



	12X18H10T (X18H10T)