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Wellhead flange connections GOST 28919 91. Technical requirements for nuts

WELLHOLD FLANGE CONNECTIONS TYPES, BASIC PARAMETERS AND DIMENSIONS

GOST 28919-91

USSR STATE COMMITTEE FOR PRODUCT QUALITY AND STANDARDS MANAGEMENT

Moscow 1991

STATE STANDARD OF THE UNION OF SSR

WELLHOLD FLANGE CONNECTIONS

Types, main parameters and dimensions

Flange connections of wellhead equipment. Types, basic parameters and dimensions

GOST 28919-91

Validity from 01.07.92

until 01.07. 1997

This standard applies to flange connections with octagonal steel O-rings intended for connection component parts wellhead oilfield equipment for operating pressure from 14 to 140 MPa and nominal bore from 50 to 680 mm, as well as for flanges, gaskets, studs and nuts flange connections.

The requirements of the standard are mandatory, except for the requirements of paragraphs. 1.1, 1.4 regarding the indicator "Stud length", p. 1.3. 1.6 in terms of the indicator "Weight, kg", which are recommended.

1. TYPES, PARAMETERS AND DIMENSIONS

1.1. Two types of flange connections are installed:

1 - with a gap between the ends of the flanges;

2 - no gap between the ends of the flanges.

For each type of flange connection, two connection options are provided: a flange with a flange and a flange with a body (that is, a connection of a flange with a flange aligned with the body).

Types, options and basic parameters of flange connections must correspond to those indicated in fig. 1 and in table. one.

Flange connections

Table 1

Nominal bore Dу, mm	Flange connection type

	Working pressure Рр, MPa	Gap between flanges, δ *, mm	Working pressure Рр, MPa
		Gap between flanges, δ *, mm

* Size for reference.

Note. An "X" indicates that this parameter combination is available.

1.2. The standard provides for 2 versions of flanges:

version 1 - for flange connections of type 1 (drawing 2);

version 2 - for flange connections of type 2 (drawing 3).

The parameters of the flanges must correspond to those indicated in table. 2 and 3.

1.3. The standard provides for two types of gaskets:

P - for flange connections of type 1 (Fig. 4);

BX - for flange connections of type 2 (Fig. 5).

* f1max = f; f1min = 3 mm. Allowed for flanges aligned with body, f1 = 0.

** For flanges with an outer diameter not exceeding 315 mm, the parallelism tolerance is 0.2 / 100.

table 2

Flange parameters of version 1 (according to drawing 2)

Dimensions, mm

Flange designation

Conditional pass Dу

Outside diameter D

Diameter of groove at the mating end D2, not less

Average diameter of the gasket groove D3

Large neck diameter D4

Full plate height h

Main plate height h1

Groove width b

Groove depth f

Radius of rounding of the groove R

Gasket designation

Studs and nuts threads

Hairpin length (according to Fig. 1)

Table 3

Flange parameters of version 2 (according to drawing 3)

Dimensions, mm

Flange designation

Conditional pass Dу

Through hole diameter d, no more

Outside diameter D

Pitch circle diameter for stud holes D1

Diameter of the groove at the butt end D2

Outer diameter of gasket groove D3

Large neck diameter D4

Small diameter of the neck D5, not less

Diameter of holes for studs d1

Number of holes for pins n

Height of the tapered part of the neck H

Full plate height h

Groove width b

Groove depth f

Applicability of components of flange connections

Gasket designation

Studs and nuts threads

Hairpin length (according to Fig. 1)

Table 4

Dimensions, mm

Gasket designation	Average diameter D	End width	Weight, kg, no more

Table 5

Dimensions, mm

Gasket designation	Outside diameter D	Outside diameter of end D1	End width b1	Bypass diameter d	Rounding radius R	Weight, kg, no more

The design, dimensions, weight and applicability of the gaskets must correspond to the versions:

P - damn. 4 and tab. 4;

BH - hell. 5 and tab. 5.

1.4. The standard provides for two types of studs:

version 1 - for parts with smooth holes;

version 2 - with a screwed end.

The design, dimensions and applicability of the studs must correspond to those indicated in the drawing. 6 and in table. 2 and 3.

d is the diameter of the thread of the stud in accordance with table. 2 or 3;

l1 = 1.25 for threads from M16 to M30 inclusive; l1 = d for М33 and more;

d1 - according to GOST 19256 or GOST 19258;

L is the length of the hairpin in accordance with table. 2 or 3.

L = L1 for flange-to-flange connection or L = L2 for flange-to-body connection.

It is allowed to manufacture studs of version 1 in accordance with GOST 22042, version 2 - in accordance with GOST 22034 (for nominal thread diameters up to 30 mm) and GOST 22032 (for nominal thread diameters over 30 mm).

Studs of execution 1 are allowed to be made with a thread along the entire length.

1.5. The design, dimensions and applicability of the nuts must correspond to those indicated in fig. 7 and in table. 6 and 7.

* Dimensions for reference

1.6. Technical requirements for gaskets, studs and nuts - according to Appendix 1.

1.7. Acceptance rules, test methods, marking and packaging of gaskets, nuts and studs - in accordance with the regulatory technical documentation for the appropriate wellhead equipment.

1.8. Symbols of flanges, gaskets, studs and nuts - according to Appendix 2.

Table 6

Type 1 Flange Nut Parameters

Dimensions, mm

Nominal thread diameter d	Thread pitch	Turnkey size S			Weight, kg	Applicability of nuts in flange connections type 1
Nominal thread diameter d	Thread pitch		Prev off	Prev off	Weight, kg	Applicability of nuts in flange connections type 1


						180"14; 50"21; 80"21; 50"35
						180"14; 65"21; 65"35
						230"14; 100"21; 180"21; 80"35
						100"35; 280"14; 350"14
						230"21; 280"21; 350"21

						540"14; 425"21 230"35

Table 7

Type 2 Flange Nut Parameters

Dimensions, mm

Nominal thread diameter d	Thread pitch	Turnkey size S		Diameter of the circumscribed circle D, not less		Limit offset of the hole axis relative to the faces	Weight, kg	Applicability in type 2 flange connections
Nominal thread diameter d			Prev off	Diameter of the circumscribed circle D, not less	Prev stcl.	Limit offset of the hole axis relative to the faces	Weight, kg	Applicability in type 2 flange connections



								80"105; 100"70; 50"140


								180"70; 180"105; 230"70

								100"140; 680"14; 280"70
								230"105; 425"35; 425"70; 350"70
								680"21; 180"140; 540"35; 280"105; 480"35



								480"105; 350"140

TECHNICAL REQUIREMENTS FOR CONNECTING PARTS OF FLANGE CONNECTIONS

1. Technical requirements for gaskets

1.1. Gaskets should only be made from solid pieces.

1.2. The hardness of the material for the manufacture of O-rings should be no more than for:

carbon steel - 107 HB;

high-quality steel - 131 HB;

carbon steel - 160 HB.

Table 8

Gasket material designation	Steel grade, standard designation	Brinell hardness, no more
	Steel 0 GOST 380
	St 08kp GOST 1050
	St 20 GOST 1050
	St 08 GOST 1050
	12 "18Н9Т GOST 5632
	10 "17Н13М3Т GOST 5632

Notes:

1. U1 and U2 gaskets are intended for non-corrosion-resistant equipment.

2. K1 gaskets are intended for equipment operating in a downhole environment with a volumetric CO2 content of up to 6%. K3 gaskets are intended for equipment operating in a downhole environment with a CO2 and H2S volume content of up to 25%.

1.3. The difference in the hardness of the material of the gaskets and flanges or the surface of the grooves of the flanges in contact with the gaskets must be at least 50 units according to Brinell, unless another standard is specified in the regulatory and technical documentation for the product.

1.4. Non-alloy steel gaskets must be coated.

Coating type - cadmium or zinc in accordance with GOST 9.301.

Coating thickness - 5-13 microns.

1.5. The sealing surfaces of the gaskets must be free from corrosion, dirt, nicks, scratches, dents and other defects.

2. TECHNICAL REQUIREMENTS FOR FLANGE STUD

2.1. Studs should be made of rolled bars or forgings.

2.2. Mechanical properties the material of the blanks or finished studs in the heat-treated state must correspond to those indicated in Table 9.

Table 9

Flange connection type	Yield strength, N / mm2	Ultimate resistance, N / mm	Relative extension, %	Impact strength,
Flange connection type

For equipment of HL and UHL versions in accordance with GOST 15150, the value of the impact strength of the material of the studs after heat treatment must be at least KCV 20 J / cm2 at a temperature of minus 60 ° C. Impact strength is checked when choosing a material and a heat treatment mode.

2.3. Metric thread - in accordance with GOST 24705 with a tolerance field of 6 g in accordance with GOST 16093, normal thread run - in accordance with GOST 27148; the thread is recommended to be made with a rounded cavity - in accordance with GOST 9150.

2.4. Studs must be coated. Coating type - cadmium chromated in accordance with GOST 9.301.

Coating thickness - 9-12 microns. By agreement with the consumer, another type of metal coating is allowed.

2.5. Protective coatings must be uniform, bubbles and flaking are not allowed.

2.6. Requirements for the roughness of the treated surfaces for coatings - in accordance with GOST 9.301.

2.7. Rest technical requirements- according to the normative and technical documentation for equipment equipped with studs.

3. TECHNICAL REQUIREMENTS FOR NUTS

3.1. The nut should be made of rolled and calibrated rolled products, forgings or stampings.

3.2. The mechanical properties of the nuts must correspond to those indicated in table. 10.

Table 10

Test load voltage is checked by material selection and heat treatment. Test method - in accordance with GOST 1759.5.

3.3. The thread is metric in accordance with GOST 24705 with a tolerance field of 6H in accordance with GOST 16093, thread run-off is normal in accordance with GOST 27148, the shape of the thread valleys is recommended with rounding in accordance with GOST 9150.

3.4. Nuts must be coated. Coating type - cadmium chromated in accordance with GOST 9.301. Coating thickness - 9-12 microns.

By agreement with the consumer, another type of metal coating is allowed. In these cases, the nut is added to the symbol.

3.5. Protective coatings must be uniform, bubbles and peeling are not allowed.

3.6. Requirements for the roughness of the treated surfaces for coatings - in accordance with GOST 9.301.

3.7. The rest of the technical requirements - according to the normative and technical documentation for the equipment equipped with nuts.

APPENDIX 2

Mandatory

SYMBOLS FOR FLANGE CONNECTIONS AND THEIR COMPONENT PARTS

1. In the technical documentation for wellhead equipment, when specifying the connecting dimensions of the flanges, their conventional designation should be given.

Flange designation (flange connections) should consist of the word "Flan", flange designation in accordance with table. 2 and 3 and symbols of this standard.

Examples of designation of flanges (flange connections) in the design documentation are given in fig. eight.

2. The designation of the gasket must consist of the word "Gasket", a code consisting of the designation of the gasket in accordance with table. 4 and 5, designations of the gasket material in accordance with table. 8, as well as designations of the normative and technical document for the supply.

Example symbol gaskets P35 from steel 08kp GOST 1050:

Gasket P35 - U1 GOST 28919-91

3, The designation of a hairpin should consist of the word "Hairpin", a cipher built according to the diagram below, and the designation of a normative and technical document for the supply.

Execution in accordance with the drawing. 6

Thread diameter

Stud length

Coating type designation according to GOST 1759.0

Coating thickness

An example of a symbol for a stud of version 1, thread diameter M24 with a large thread pitch, length L = 150 mm of a flange connection of type 1 with a cadmium coating 10 μm thick:

Hairpin 1-М24 "150-1-02.10 GOST 28919-91

4. The symbol for the nut must consist of the word "Nut", the code built according to the scheme below, and the designation of the normative and technical document for the supply.

Thread diameter

Thread pitch (coarse pitch is not indicated)

Flange connection type (according to clause 1.1 of this standard)

Coating type designation according to GOST 1759.0

Coating thickness

An example of a symbol for a nut with a thread diameter M36 with a fine thread pitch of 3 mm for a type 2 flange connection with a cadmium coating and chromating with a thickness of 10 μm:

Nut М24 "3-2-02.10 GOST 28919-91

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the USSR Ministry of Heavy Engineering

DEVELOPERS

N. G. Kurbanov; A. G. Dozortsev, Cand. tech. sciences; T. K.Believ, Cand. tech. sciences; B.O. Frenkel, Cand. tech. sciences;Kh.T. Kakhramanov, Cand. tech. sciences; I. M. Nisenbaum

2. APPROVED AND INTRODUCED BY Decree State Committee USSR on product quality management and standards dated 02.26.91 No. 178

3. Inspection period - 1996. Inspection frequency - 5 years

4. INTRODUCED FOR THE FIRST TIME

5. REFERENCE REGULATORY AND TECHNICAL DOCUMENTS

	Item number
GOST 9.301-86	Annex 1
	Annex 1
GOST 1050-88	Appendix 1, 2
GOST 1759.0-87	Appendix 1, 2
GOST 1759.5-87	Annex 1
GOST 5632-72	Annex 1
GOST 9150-81	Annex 1
GOST 15150-69	Annex 1
GOST 16093-81	Annex 1
GOST 19256-73
GOST 19258-73
GOST 22032-76
GOST 22034-76
GOST 22042-76
GOST 24705-81	Annex 1
GOST 27148-86	Annex 1

Date of introduction 01.07.92

You can order flanges GOST 28919 91 on our website simply by filling out the form below, and also read the detailed specifications... We also sell other types of products of this and other standards, for example, welded flanges GOST 28919, find out full list You can also contact us by phone or by writing to the e-mail indicated at the top of the website for the products sold.

1. TYPES, PARAMETERS AND DIMENSIONS

1.1. Two types of flange connections are installed:

1 - with a gap between the ends of the flanges;

2 - no gap between the ends of the flanges.

For each type of flange connection, two connection options are provided: a flange with a flange and a flange with a body (that is, a connection of a flange with a flange aligned with the body).

Types, options and basic parameters of flange connections must correspond to those indicated in fig. 1 and in table. one.

Flange connection types

Table 1

Conditional pass D y, mm	Flange connection type

	Operating pressure R p, MPa	Gap between flanges, δ *, mm	Operating pressure R p, MPa
		Gap between flanges, δ *, mm

* Size for reference.

Note. An "X" indicates that this parameter combination is available.

1.2. The standard provides for 2 versions of flanges:

version 1 - for flange connections of type 1 (drawing 2);

version 2 - for flange connections of type 2 (drawing 3).

The parameters of the flanges must correspond to those indicated in table. 2 and 3.

1.3. The standard provides for two types of gaskets:

P - for flange connections of type 1 (Fig. 4);

BX - for flange connections of type 2 (Fig. 5).

* f 1max = f; f 1min = 3 mm. Allowed for flanges aligned with the body, f 1 = 0.

** For flanges with an outer diameter not exceeding 315 mm, the parallelism tolerance is 0.2 / 100.

Table 4. Dimensions, mm

Gasket designation	Average diameter D	Height h	Width b	End width	Weight, kg, no more

Table 5. Dimensions, mm

Gasket designation	Outside diameter D	Outside diameter of the end D 1	Width b	End width b 1	Height h	Bypass diameter d	Rounding radius R	Weight, kg, no more

The design, dimensions, weight and applicability of the gaskets must correspond to the versions:

P - damn. 4 and tab. 4;

BH - hell. 5 and tab. 5.

1.4. The standard provides for two types of studs:

version 1 - for parts with smooth holes;

version 2 - with a screwed end.

The design, dimensions and applicability of the studs must correspond to those indicated in the drawing. 6 and in table. 2 and 3.

d- thread diameter of the stud in accordance with table. 2 or 3;

l = 2d ;

l 1 = 1.25 for threads from M 16 to M30 inclusive; l 1 = d for M33 and more;

d 1 - according to GOST 19256 or GOST 19258;

L- the length of the hairpin in accordance with table. 2 or 3.

L = L 1 for flange-to-flange connection or L = L 2 for flange-to-body connection.

Studs of execution 1 are allowed to be made with a thread along the entire length.

1.5. The design, dimensions and applicability of the nuts must correspond to those indicated in fig. 7 and in table. 6 and 7.

* Dimensions for reference

1.6. Technical requirements for gaskets, studs and nuts - according to Appendix 1.

1.7. Acceptance rules, test methods, marking and packaging of gaskets, nuts and studs - in accordance with the normative and technical documentation for the corresponding wellhead equipment.

1.8. Symbols of flanges, gaskets, studs and nuts - according to Appendix 2.

Table 6. GOST 28919 91 nut - parameters for flange connections of type 1. Dimensions, mm

Nominal thread diameter d	Thread pitch	Turnkey size S		Diameter of the circumscribed circle D, not less	Height N		Weight, kg	Applicability of nuts in flange connections type 1
Nominal thread diameter d	Thread pitch		Prev off	Diameter of the circumscribed circle D, not less		Prev off	Weight, kg	Applicability of nuts in flange connections type 1

								65 ´ 14; 80 ´ 14
								180 ´ 14; 50 ´ 21; 80 ´ 21; 50 ´ 35
								180 ´ 14; 65 ´ 21; 65 ´ 35
								230 ´ 14; 100 ´ 21; 180 ´ 21; 80 ´ 35
								100 ´ 35; 280 ´ 14; 350 ´ 14
								230 ´ 21; 280 ´ 21; 350 ´ 21

								540 ´ 14; 425 ´ 21 230 ´ 35

Table 7. GOST 28919 91 nut - parameters for flange connections of type 2. Dimensions, mm

Nominal thread diameter d	Thread pitch	Turnkey size S		Diameter of the circumscribed circle D, not less		Limit offset of the hole axis relative to the faces	Weight, kg	Applicability in type 2 flange connections
Nominal thread diameter d			Prev off	Diameter of the circumscribed circle D, not less	Prev stcl.	Limit offset of the hole axis relative to the faces	Weight, kg	Applicability in type 2 flange connections

								65 ´ 70; 50 ´ 105
								80 ´ 70; 65 ´ 105
								80 ´ 105; 100 ´ 70; 50 ´ 140

								100 ´ 105; 80 ´ 140
								180 ´ 70; 180 ´ 105; 230 ´ 70

								100 ´ 140; 680 ´ 14; 280 ´ 70
								230 ´ 105; 425 ´ 35; 425 ´ 70; 350 ´ 70
								680 ´ 21; 180 ´ 140; 540 ´ 35; 280 ´ 105; 480 ´ 35
								480 ´ 70; 350 ´ 105
								540 ´ 70; 230 ´ 140

								480 ´ 105; 350 ´ 140

TECHNICAL REQUIREMENTS FOR CONNECTING PARTS OF FLANGE CONNECTIONS

1. Technical requirements for gaskets

1.1. Gaskets should only be made from solid pieces.

1.2. The hardness of the material for the manufacture of O-rings should be no more than for:

carbon steel - 107 HB;

high-quality steel - 131 HB;

carbon steel - 160 HB.

Table 8.

Gasket material designation	Steel grade, standard designation	Brinell hardness, no more
	Steel 0 GOST 380
	St 08kp GOST 1050
	St 20 GOST 1050
	St 08 GOST 1050
	12 ´ 18Н9Т GOST 5632
	10 ´ 17N13M3T GOST 5632

Notes:

1. U1 and U2 gaskets are intended for non-corrosion-resistant equipment.

1.3. Different hardness of the material of the gaskets and flanges or the surface of the grooves of the flanges in contact with the gaskets must be at least 50 units according to Brinell, unless a different norm is specified in the regulatory and technical documentation for the product.

1.4. Non-alloy steel gaskets must be coated.

Coating type - cadmium or zinc in accordance with GOST 9.301.

Coating thickness - 5-13 microns.

1.5. The sealing surfaces of the gaskets must be free from corrosion, dirt, nicks, scratches, dents and other defects.

2.GOST 28919 91 STUD OF FLANGE CONNECTIONS - TECHNICAL REQUIREMENTS

2.1. GOST 28919 91, studs should be made from rolled sections or forgings.

2.2. The mechanical properties of the material of the blanks or finished studs in the heat-treated state must correspond to those indicated in table. 9.

Table 9.

Flange connection type	Yield strength, N / mm2	Ultimate resistance, N / mm	Relative extension, %	Impact strength,
Flange connection type

2.4. Studs must be coated. Coating type - cadmium chromated in accordance with GOST 9.301.

Coating thickness - 9-12 microns. By agreement with the consumer, another type of metal coating is allowed.

2.5. Protective coatings must be uniform, bubbles and flaking are not allowed.

2.6. Requirements for the roughness of the treated surfaces for coatings - in accordance with GOST 9.301.

2.7. The rest of the technical requirements - according to the normative and technical documentation for the equipment, complete with studs.

3. GOST 28919 91 NUT - TECHNICAL REQUIREMENTS

3.1. GOST 28919 91 nuts should be made from section and calibrated rolled products, forgings or stampings.

3.2. The mechanical properties of the nuts must correspond to those indicated in table. 10.

Table 10.

Test load voltage is checked by material selection and heat treatment. Test method - in accordance with GOST 1759.5.

3.4. Nuts must be coated. Coating type - cadmium chromated in accordance with GOST 9.301. Coating thickness - 9-12 microns.

By agreement with the consumer, another type of metal coating is allowed. In these cases, the designation of the type of coating according to GOST 1759.0 is added to the symbol of the nut.

3.5. Protective coatings must be uniform, bubbles and peeling are not allowed.

3.6. Requirements for the roughness of the treated surfaces for coatings - in accordance with GOST 9.301.

3.7. The rest of the technical requirements - according to the normative and technical documentation for the equipment equipped with nuts.

APPENDIX 2 Mandatory

SYMBOLS FOR FLANGE CONNECTIONS AND THEIR COMPONENT PARTS

1. In the technical documentation for wellhead equipment, when specifying the connecting dimensions of the flanges, their conventional designation should be given.

Flange designation (flange connections) should consist of the word "Flan", flange designation in accordance with table. 2 and 3 and symbols of this standard.

Examples of designation of flanges (flange connections) in the design documentation are given in fig. eight.

An example of a symbol for a P35 gasket made of steel 08kp GOST 1050:

Gasket P35 - U1 GOST 28919-91

3, The designation of a hairpin should consist of the word "Hairpin", a cipher built according to the diagram below, and the designation of a normative and technical document for the supply.

Execution in accordance with the drawing. 6

Thread diameter

Thread pitch (coarse pitch is not indicated)

Stud length

Flange connection type (according to clause 1.1 of this standard)

Coating type designation according to GOST 1759.0

Coating thickness

An example of a symbol for a stud of version 1, thread diameter M24 with a large thread pitch, length L= 150 mm flange connection type 1 with 10 μm cadmium coating:

Hairpin 1-М24´150-1-02.10 GOST 28919-91

4. The symbol for the nut must consist of the word "Nut", the code built according to the scheme below, and the designation of the normative and technical document for the supply.

WELLHOLD FLANGE CONNECTIONS TYPES,

BASIC PARAMETERS AND DIMENSIONS

GOST 28919-91

USSR STATE COMMITTEE FOR PRODUCT QUALITY AND STANDARDS MANAGEMENT Moscow 1991 STATE STANDARD OF THE UNION OF SSR

This standard applies to flange joints with steel O-rings of octagonal cross-section, designed to connect the components of wellhead oilfield equipment for operating pressures from 14 to 140 MPa and nominal bore from 50 to 680 mm, as well as flanges, gaskets, studs and nuts of flange joints. ... The requirements of the standard are mandatory, except for the requirements of paragraphs. 1.1, 1.4 regarding the indicator "Stud length", p. 1.3. 1.6 in terms of the indicator "Weight, kg", which are recommended.

1. TYPES, PARAMETERS AND DIMENSIONS

1.1. Two types of flange connections are installed:

1 - with a gap between the ends of the flanges;

2 - no gap between the ends of the flanges.

For each type of flange connection, two connection options are provided: a flange with a flange and a flange with a body (that is, a connection of a flange with a flange aligned with the body). Types, options and basic parameters of flange connections must correspond to those indicated in fig. 1 and in table. one.

Flange connection types

1.2. The standard provides for 2 versions of flanges:

version 1 - for flange connections of type 1 (drawing 2);

version 2 - for flange connections of type 2 (drawing 3).

The parameters of the flanges must correspond to those indicated in table. 2 and 3.3.

The standard provides for two types of gaskets:

P - for flange connections of type 1 (Fig. 4);

BX - for flange connections of type 2 (Fig. 5).

* f1max = f; f1min = 3 mm. Allowed for flanges aligned with body, f1 = 0.

** For flanges with an outer diameter not exceeding 315 mm, the parallelism tolerance is 0.2 / 100.

The design, dimensions, weight and applicability of the gaskets must correspond to the versions:

P - damn. 4 and tab. 4;

BH - hell. 5 and tab. 5.

1.4. The standard provides for two types of studs:

version 1 - for parts with smooth holes;

version 2 - with a screwed end.

The design, dimensions and applicability of the studs must correspond to those indicated in the drawing. 6 and in table. 2 and 3.

d is the diameter of the thread of the stud in accordance with table. 2 or 3;

l = 2d; l1 = 1.25 for threads from M16 to M30 inclusive; l1 = d for М33 and more;

d1 - according to GOST 19256 or GOST 19258; L is the length of the hairpin in accordance with table. 2 or 3.

L = L1 for flange-to-flange connection or L = L2 for flange-to-body connection.

It is allowed to manufacture studs of version 1 according to GOST 22042, version 2 - according to GOST 22034 (for nominal thread diameters up to 30 mm)

and according to GOST 22032 (for nominal thread diameters over 30 mm).

Studs of execution 1 are allowed to be made with a thread along the entire length.

1.5. The design, dimensions and applicability of the nuts must correspond to those indicated in fig. 7 and in table. 6 and 7

1.6. Technical requirements for gaskets, studs and nuts - according to Appendix 1.

1.7. Acceptance rules, test methods, marking and packaging of gaskets, nuts and studs - in accordance with the normative and technical documentation for the corresponding wellhead equipment.

1.8. Symbols of flanges, gaskets, studs and nuts - according to Appendix 2.

TECHNICAL REQUIREMENTS FOR CONNECTING PARTS OF FLANGE CONNECTIONS

1. Technical requirements for gaskets

1.1. Gaskets should only be made from solid pieces.

1.2. The hardness of the material for the manufacture of O-rings should be no more than for:

carbon steel - 107 HB;

high-quality steel - 131 HB;

carbon steel - 160 HB.

Notes:

1. U1 and U2 gaskets are intended for non-corrosion-resistant equipment.

1.4. Non-alloy steel gaskets must be coated. Coating type - cadmium or zinc in accordance with GOST 9.301.

Coating thickness - 5-13 microns. 1.5. The sealing surfaces of the gaskets must be free from corrosion, dirt, nicks, scratches, dents and other defects.

2. TECHNICAL REQUIREMENTS FOR FLANGE STUD

2.1. Studs should be made of rolled bars or forgings.

2.2. The mechanical properties of the material of the blanks or finished studs in the heat-treated state must correspond to those indicated in Table 9.

2.4. Studs must be coated. Coating type - cadmium chromated in accordance with GOST 9.301. Coating thickness - 9-12 microns. By agreement with the consumer, another type of metal coating is allowed.

2.5. Protective coatings must be uniform, bubbles and flaking are not allowed.

2.6. Requirements for the roughness of the treated surfaces for coatings - in accordance with GOST 9.301.

2.7. The rest of the technical requirements - according to the normative and technical documentation for the equipment, complete with studs.

3. TECHNICAL REQUIREMENTS FOR NUTS

3.1. The nut should be made of rolled and calibrated rolled products, forgings or stampings.

3.2. The mechanical properties of the nuts must correspond to those indicated in table. 10.

Test load voltage is checked by material selection and heat treatment. Test method - in accordance with GOST 1759.5.

3.4. Nuts must be coated. Coating type - cadmium chromated in accordance with GOST 9.301. Coating thickness - 9-12 microns. By agreement with the consumer, another type of metal coating is allowed. In these cases, the nut is added to the symbol.

3.5. Protective coatings must be uniform, bubbles and peeling are not allowed.

3.6. Requirements for the roughness of the treated surfaces for coatings - in accordance with GOST 9.301.

3.7. The rest of the technical requirements - according to the normative and technical documentation for the equipment equipped with nuts.

APPENDIX 2 Mandatory

SYMBOLS FOR FLANGE CONNECTIONS AND THEIR COMPONENT PARTS

1. In the technical documentation for wellhead equipment, when specifying the connecting dimensions of the flanges, their conventional designation should be given. Flange designation (flange connections) should consist of the word "Flan", flange designation in accordance with table. 2 and 3 and symbols of this standard. Examples of designation of flanges (flange connections) in the design documentation are given in fig. eight.

An example of a symbol for a P35 gasket made of steel 08kp GOST 1050:

Gasket P35 - U1 GOST 28919-91

3, The designation of a hairpin should consist of the word "Hairpin", a cipher built according to the diagram below, and the designation of a normative and technical document for the supply.

Execution in accordance with the drawing. 6

Thread diameter

Stud length

Coating type designation according to GOST 1759.0

Coating thickness

An example of a symbol for a stud of version 1, thread diameter M24 with a large thread pitch, length L = 150 mm of a flange connection of type 1 with cadmium

coating with a thickness of 10 microns:

Hairpin 1-М24´150-1-02.10 GOST 28919-91

4. The symbol for the nut must consist of the word "Nut", the code built according to the scheme below, and the designation of the normative and technical document for the supply.

Thread diameter

Thread pitch (coarse pitch is not indicated)

Flange connection type (according to clause 1.1 of this standard)

Coating type designation according to GOST 1759.0

Coating thickness

An example of a symbol for a nut with a thread diameter of M36 with a fine thread pitch of 3 mm for a flange connection of type 2 with cadmium plated chromated

10 microns thick:

Nut М24´3-2-02.10 GOST 28919-91

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the USSR Ministry of Heavy Engineering. DEVELOPERS NG Kurbanov; A. G. Dozortsev, Cand. tech. sciences; T. K. Believ, Cand. tech. sciences; B.O. Frenkel, Cand. tech. sciences; Kh.T. Kakhramanov, Cand. tech. sciences; I. M. Nisenbaum

2. APPROVED AND INTRODUCED INTO EFFECT by the Decree of the USSR State Committee on Product Quality Management and Standards dated 02.26.91 No. 178

3. Inspection period - 1996. Inspection frequency - 5 years

4. INTRODUCED FOR THE FIRST TIME 5. REFERENCE REGULATORY AND TECHNICAL DOCUMENTS

INTERSTATE STANDARD

TYPES, BASIC PARAMETERS AND DIMENSIONS

Official edition

IPK PUBLISHING STANDARDS Moscow

INTERSTATE STANDARD

WELLHOLD FLANGE CONNECTIONS

Types, main parameters and dimensions

Flange connections of wellhead equipment. Types, basic parameters and dimensions

GOST

28919-91

ISS 75.180.10 OKP 36 6000

Date of introduction 07/01/92

The requirements of the standard are mandatory, except for the requirements of paragraphs. 1.1, 1.4 regarding the indicator "Stud length", p. 1.3, 1.6 in terms of the indicator "Weight, kg", which are recommended.

1. TYPES, PARAMETERS AND DIMENSIONS

1.1. Two types of flange connections are installed:

1 - with a gap between the ends of the flanges;

2 - no gap between the ends of the flanges.

For each type of flange connection, two connection options are provided: a flange with a flange and a flange with a body (that is, a connection of a flange with a flange aligned with the body).

Types, options and basic parameters of flange connections must correspond to those indicated in fig. 1 and in table. one.

Flange connection types

Flange-flange Flange-body

Official edition

Reprinting prohibited

Continuation of table. 7

Dimensions, mm

Nominal thread diameter d	Thread pitch	Turnkey size S	Weight, kg
Nominal thread diameter d			Weight, kg

				100 x 140; 680 x 14; 280 x 70
				230 x 105; 425 x 35; 425 x 70; 350 x 70
				680x 21; 180 x 140; 540 x 35; 280 x 105; 480 x 35
				480 x 70; 350 x 105
				540 x 70; 230 x 140

				480 x 105; 350 x 140

1.6. Technical requirements for gaskets, studs and nuts - according to Appendix 1.

1.7. Acceptance rules, test methods, marking and packaging of gaskets, nuts and studs - in accordance with the normative and technical documentation for the corresponding wellhead equipment.

1.8. Symbols of flanges, gaskets, studs and nuts - according to Appendix 2.

GOST 28919-91 p. 11

TECHNICAL REQUIREMENTS FOR CONNECTING PARTS OF FLANGE CONNECTIONS

1. Technical requirements for gaskets

1.1. Gaskets should only be made from solid pieces.

1.2. The hardness of the material for the manufacture of ring gaskets should be, no more, for:

Carbon steel - 107 HB;

Quality steel - 131 HB;

Carbon steel - 160 HB.

Table 8

Gasket material designation	Steel grade, standard designation	Brinell hardness, no more

Notes:

1. U1 and U2 gaskets are designed for non-corrosive equipment.

2. K1 gaskets are intended for equipment operating in a downhole environment with a volumetric content of C0 2 up to 6%, KZ gaskets are intended for equipment operating in a downhole environment with a volumetric content of C0 2 and H 2 S up to 25%.

1.4. Non-alloy steel gaskets must be coated.

Coating type - cadmium or zinc in accordance with GOST 9.301.

Coating thickness - 5-13 microns.

1.5. The sealing surfaces of the gaskets must be free from corrosion, dirt, nicks, scratches, dents and other defects.

2. Technical requirements for studs of flange connections

2.1. Studs should be made of rolled bars or forgings.

2.2. The mechanical properties of the material of the blanks or finished studs in the heat-treated state must correspond to those indicated in table. 9.

For equipment of HL and UHL versions in accordance with GOST 15150, the value of the impact strength of the material of the studs after heat treatment must be at least KCV 20 J / cm 2 at a temperature of minus 60 ° C. Impact strength is checked when choosing a material and a heat treatment mode.

2.4. Studs must be coated. Coating type - cadmium chromated in accordance with GOST 9.301.

Coating thickness - 9-12 microns. By agreement with the consumer, another type of metal coating is allowed.

2.5. Protective coatings must be uniform, bubbles and peeling are not allowed.

2.6. Requirements for the roughness of the treated surfaces for coatings - in accordance with GOST 9.301.

2.7. The rest of the technical requirements - according to the normative and technical documentation for the equipment, complete with studs.

3. Technical requirements for nuts

3.1. Nuts should be made from section and calibrated rolled products, forgings or stampings.

3.2. The mechanical properties of the nuts must correspond to those indicated in table. 10.

Test load voltage is checked by material selection and heat treatment. Test method - in accordance with GOST 1759.5.

3.4. Nuts must be coated. Coating type - cadmium chromated in accordance with GOST 9.301. Coating thickness - 9-12 microns.

By agreement with the consumer, another type of metal coating is allowed. In these cases, the designation of the type of coating according to GOST 1759.0 is added to the symbol of the nut.

3.5. Protective coatings must be uniform, bubbles and peeling are not allowed.

3.6. Requirements for the roughness of the treated surfaces for coatings - in accordance with GOST 9.301.

3.7. The rest of the technical requirements - according to the normative and technical documentation for the equipment equipped with nuts.

APPENDIX 2 Mandatory

SYMBOLS FOR FLANGE CONNECTIONS AND THEIR COMPONENT PARTS

1. In the technical documentation for wellhead equipment, when specifying the connecting dimensions of the flanges, their conventional designation should be given.

Flange designation (flange connections) should consist of the word "Flan", flange designation in accordance with table. 2 and 3 and symbols of this standard.

Examples of designation of flanges (flange connections) in the design documentation are given in fig. eight.

Flan 180 * 35 GOST

GOST 28919-91 p. 13

An example of a symbol for a P35 gasket made of steel 08kp GOST 1050:

3. The symbol for a hairpin must consist of the word "Hairpin", a cipher built according to the diagram below, and the designation of a normative and technical document for the supply.

An example of a symbol for a nut with a thread diameter M36 with a fine thread pitch of 3 mm for a type 2 flange connection with a cadmium coating and chromating with a thickness of 10 μm:

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the USSR Ministry of Heavy Engineering

2. APPROVED AND INTRODUCED INTO EFFECT by the Decree of the USSR State Committee on Product Quality Management and Standards dated 02.26.91 No. 178

3. INTRODUCED FOR THE FIRST TIME

4. REFERENCE REGULATORY AND TECHNICAL DOCUMENTS

5. The limitation of the period of validity was removed according to the protocol No. 7-95 of the Interstate Council for Standardization, Metrology and Certification (NUS 11-95)

6. REPUBLICATION. January 2005

Editor V.N. Kopysov Technical editor V.N. Prusakova Proofreader E. D. Dulneva Computer layout L.А. Circular

Ed. persons. No. 02354 dated 07/14/2000. Donated to the set 01/24/2005. Signed for printing on 11.02.2005. Uel. print l. 1.86. Uch.-ed. l. 1.50. Circulation 74 copies. 439. Zak. 77.

IPK Standards Publishing House, 107076 Moscow, Kolodezny Lane, 14. http://www.standards.ru e-mail: info@standards.ru Typeset in the Publishing House on a PC Printed at the IPK branch Standards Publishing House - type. "Moscow printer", 105062 Moscow, Lyalin per., 6.

Ppr No. 080102

Table 1

Nominal bore D y, mm	Flange connection type

	Working pressure P p, MPa	Clearance between flanges, 5 *, mm	Working pressure P p, MPa
		Clearance between flanges, 5 *, mm

* Size for reference.

Note. The "x" sign indicates that this combination of parameters is provided.

1.2. The standard provides for two versions of flanges:

1 - for flange connections of type 1 (drawing 2);

2 - for flange connections of type 2 (Fig. 3).

The parameters of the flanges must correspond to those indicated in table. 2 and 3.

Flange designation

Nominal size D y

Outside diameter D

The diameter of the groove at the mating end Di, not less

Average diameter of the gasket groove Dy

Large neck diameter Da

Full plate height h

Main plate height hi

Groove width b

Groove depth /

Flange designation

Conditional pass Dy

Through hole diameter d, no more

Outside diameter D

Diameter of the pitch circle of the centers of the holes for the studs D \

Diameter of groove at the butt end Ih, not less

Average diameter of the groove for the gasket Dz

Large neck diameter Da

Diameter of holes for pins d \

Number of holes for pins n

Full plate height h

Main plate height h \

Groove width b

				Flange designation
				Conditional pass Dy
				Through hole diameter d, no more
				Outside diameter D
				Diameter of the pitch circle of the centers of the holes for the studs D \
				Diameter of the groove at the butt end Z> 2
				Outer diameter of gasket groove Dy
				Large neck diameter G> 4
				Small neck diameter Dy, not less
				Diameter of holes for pins d \
				Number of holes for pins n
				Height of the tapered part of the neck H
				Full plate height h
				Groove width b
				Groove depth /
				Gasket designation
				Studs and nuts threads		S 3 s g 1 2 x 5 2 2 >< & О ^ <г Q -С g ta &э S

a

I

R p 140 MPa

1.3. The standard provides for two types of gaskets:

P - for flange connections of type 1 (Fig. 4);

BX - for flange connections of type 2 (Fig. 5).

The design, dimensions, weight and applicability of the gaskets must correspond to the versions:

P - damn. 4 and tab. 4;

Dimensions, mm

Table 4

Designation gaskets	Average diameter D	End width b (	Weight, kg, no more

Dimensions, mm

Table 5

Designation gaskets	Outside diameter D	Outside diameter of the end 2),	End width b (	fillets	Weight, kg, no more

Dimensions, mm

Continuation of table. 5

Designation gaskets	Outer diameter B	Outside diameter of the end By	Butt width by	Bypass diameter d	rounded	Weight, kg, no more

1.4. The standard provides for two types of studs:

1 - for parts with smooth holes;

2 - with a screwed end.

The design, dimensions and applicability of the studs must correspond to those indicated in the drawing. 6 and in table. 2 and 3.

Execution 1

d is the diameter of the thread of the stud in accordance with table. 2 or 3;

/ j = 1.25 for threads from М16 to МСО inclusive; /, = d for MVZ and more; dy - according to GOST 19256 or GOST 19258;

L is the length of the hairpin in accordance with table. 2 or 3.

L = Ly for flange-flange connection or L = L 2 for flange-body connection

It is allowed to manufacture studs of version 1 according to GOST 22042, version 2 - according to GOST 22034 (for nominal thread diameters up to 30 mm) and GOST 22032 (for nominal thread diameters over 30 mm).

Studs of execution 1 are allowed to be made with a thread along the entire length.

1.5. The design, dimensions and applicability of the nuts must correspond to those indicated in fig. 7 and in table. 6 and 7.

44 V)

					Nominal thread diameter d
						Thread pitch
						Thread pitch
						Turnkey size S
						Turnkey size S
					Diameter of the circumscribed circle D, not less


					Limit offset of the hole axis relative to the faces
					Weight, kg
180x70; 180 x 105; 230 x 70	100 X 105; 80 x 140	80 x 105; 100 x 70; 50 x 140	80 x 70; 65 x 105	65 x 70; 50 x 105	Applicability in type 2 flange connections

Type 2 Flange Nut Parameters

Dimensions, mm

Nominal thread diameter d

Thread pitch

Turnkey size S

Diameter of the circumscribed circle D, not less

Limit offset of the hole axis relative to the faces

Weight, kg

540 x 14; 425 x21 230 x 35

230x21; 280x21; 350x21

100 x 35; 280 x 14; 350 x 14

230 x 14; 100x21; 180x21; 80x35

180 x 14; 65x21; 65x35

180 x 14; 50x21; 80x21; 50x35

65 x 14; 80 x 14

Applicability of nuts in flange connections type 1

Wellhead flange connections GOST 28919 91. Technical requirements for nuts

1. TYPES, PARAMETERS AND DIMENSIONS

TECHNICAL REQUIREMENTS FOR CONNECTING PARTS OF FLANGE CONNECTIONS

2. TECHNICAL REQUIREMENTS FOR FLANGE STUD

3. TECHNICAL REQUIREMENTS FOR NUTS

SYMBOLS FOR FLANGE CONNECTIONS AND THEIR COMPONENT PARTS

INFORMATION DATA

1. TYPES, PARAMETERS AND DIMENSIONS

TECHNICAL REQUIREMENTS FOR CONNECTING PARTS OF FLANGE CONNECTIONS

2.GOST 28919 91 STUD OF FLANGE CONNECTIONS - TECHNICAL REQUIREMENTS

3. GOST 28919 91 NUT - TECHNICAL REQUIREMENTS

APPENDIX 2 Mandatory

SYMBOLS FOR FLANGE CONNECTIONS AND THEIR COMPONENT PARTS

GOST

28919-91

GOST 28919-91 p. 11

GOST 28919-91 p. 13

a

I

44 V)

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