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PB-03-108-96

DEVICE RULES
AND SAFE OPERATION
PROCESS PIPING

DEVELOPED by Gosgortekhnadzor of Russia, Nizhne-Volzhsky District of Gosgortekhnadzor of Russia, research and design institutes: VNIKTIneftekhimoborudovaniye, NIIkhimmash, Giprokhimmontazh, IrkutskNIIkhimmash, GIAP, VNIIneftemash, VNIPIneft, YuzhNIIgiprogaz, Sintezproekt OJSC, VNIImontazhspetsstroy, taking into account the comments of the Bashkir District of Gosgorte Hnadzor of Russia, AOOT " Angarsk Oil Company, Salavatnefteorgsintez OJSC, Kuibyshevazot CJSC, NIIPTkhimnefteapparatura, Nizhnekamskneftekhim OJSC and other interested organizations and enterprises.

Editorial committee: E.A.Malov (chairman), A.A.Shatalov (deputy chairman), L.N.Ganshina, B.M.Gusev, S.I.Zusmanovskaya, G.V.Kiryukhin, V.N. .Konovalov, N.V. Martynov, Yu.S. Medvedev, E.Ya. , N.V. Khimchenko, M.P. Elyash.

APPROVED by the Decree of the Gosgortekhnadzor of Russia dated 02.03.95 No. 11.

REPLACEMENT of the "Rules for the Construction and Safe Operation of Pipelines for Combustible, Toxic and Liquefied Gases (PUG-64)", approved by the USSR Gosgortekhnadzor in 1969.

These Rules establish general provisions and basic technical requirements for process pipelines: conditions for the selection and use of pipes, pipeline parts, fittings and basic materials for their manufacture, as well as requirements for welding and heat treatment, placement of pipelines, conditions for normal operation and repair, compliance with which is mandatory for all industries, having production facilities controlled by Gosgortekhnadzor of Russia.
All current industry normative and technical documents and instructions regarding the design, installation, operation and repair of steel in-plant and shop process pipelines must be brought into line with these Rules.
The need for and timing of bringing existing pipelines in line with these Rules are determined by the administration of the enterprise and agreed with regional bodies Gosgortekhnadzor of Russia.

1. GENERAL PROVISIONS

1. 1. Scope
1.1.1. The rules for the design and safe operation of process pipelines* apply to the design, installation, manufacture, installation, operation and repair of stationary steel process pipelines designed to transport gaseous, vaporous and liquid media in the range from a residual pressure (vacuum) of 0.001 MPa (0.01 kgf /cm) up to a nominal pressure of 320 MPa (3200 kgf/cm) and operating temperatures from minus 196 to plus 700°C at chemical, petrochemical, oil refining, gas processing, chemical-pharmaceutical, pulp and paper, microbiological, coke-chemical, oil and gas enterprises.
______________
* Rules for the construction and safe operation of technological pipelines, hereinafter referred to as the Rules.
Notes. 1. Process pipelines include pipelines within industrial enterprises through which raw materials, semi-finished products and finished products, steam, water, fuel, reagents and other substances are transported, ensuring the conduct of the technological process and operation of equipment, as well as inter-factory pipelines that are on the balance sheet of the enterprise.
2. The terms "pressure", "conditional pressure", except for specially stipulated cases, should be understood as overpressure.

1.1.2. Along with these Rules, when designing, constructing and operating technological pipelines, one should also be guided by the relevant sections building codes and the Rules (SNiP), the relevant rules of the Gosgortekhnadzor of Russia and other mandatory rules and regulations.
In this case, it is necessary to take into account the requirements of fire and explosion safety, industrial sanitation and labor protection, set out in the relevant regulatory and technical documents (NTD), approved in the prescribed manner.
1.1.3. When designing and operating pipelines for liquid and gaseous chlorine, along with these Rules, one should be guided by the Safety Rules for the Production, Storage, Transportation and Use of Chlorine (PBH-93).
1.1.4. When designing and operating air and inert gas pipelines, along with these Rules, one should be guided by the requirements of the Rules for the Design and Safe Operation of Stationary compressor units, air ducts and gas pipelines.
1.1.5. When designing and operating pipelines transporting gas containing hydrogen sulfide, along with these Rules, one should be guided by industry NTD, agreed with the Gosgortekhnadzor of Russia, and recommendations of specialized research organizations.
1.1.6. These Rules do not apply to pipelines:
main (gas pipelines, oil pipelines and product pipelines);
acetylene and oxygen;
power plants, boiler houses, mines;
heating networks, water supply and sewerage lines;
lined with non-metallic materials;
gases containing explosive dust and fiber;
temporary, constructed for the period of construction, installation or reconstruction of an enterprise or workshop, with a service life of not more than 1 year;
special purpose (nuclear plants, mobile units, lubrication systems that are an integral part of the equipment, etc.);
couple and hot water I category with a diameter of 51 mm or more, as well as all other categories with a diameter of 76 mm or more, which are subject to the requirements of the Rules for the Design and Safe Operation of Steam and Hot Water Pipelines;
fuel gas, which are subject to the Safety Rules in the gas sector, when using gas from main and city gas pipelines or liquefied gases as fuel.
1.1.7. Depending on the operating pressure, process pipelines covered by these Rules are divided into low-pressure process pipelines with a nominal pressure of up to 10 MPa (100 kgf/cm) inclusive and high-pressure process pipelines with a nominal pressure of more than 10 MPa (100 kgf/cm ) up to 320 MPa (3200 kgf/cm).
1.1.8. It is allowed to develop industry normative documents regulating the conditions and requirements of a particular industry, within the main provisions and requirements of these Rules.

1. 2. Basic provisions
1.2.1. These Rules establish the basic technical requirements for the design, installation, manufacture, installation, operation and repair of technological steel pipelines, as well as the conditions for the selection and use of pipes, pipeline parts, fittings and basic materials. Compliance with these Rules is mandatory for all enterprises and organizations involved in the design, manufacture, installation and operation of technological pipelines, regardless of departmental subordination and organizational and legal forms.
1.2.2. For pipes, fittings and connecting parts of pipelines, conditional (P) and the corresponding test (P), as well as working (P) pressures are determined according to GOST 356. At a negative working temperature of the medium, the conditional pressure is determined at a temperature of plus 20 ° C.
1.2.3. The wall thickness of pipes and pipeline parts should be determined by strength calculation depending on the operating (calculated) parameters, corrosion and erosion properties of the medium in accordance with regulatory and technical documents in relation to the current range of pipes. When choosing the wall thickness of pipes and pipeline parts, the features of their manufacturing technology (bending, assembly, welding) should be taken into account.
For the maximum working (calculated) pressure in the pipeline is taken:
permitted pressure for the apparatus to which the pipeline is connected;
for pressure pipelines (after pumps, compressors, gas blowers) - the maximum pressure developed by a centrifugal machine with a closed valve on the discharge side; and for reciprocating machines - the response pressure of the safety valve installed on the pressure source;
for pipelines with safety valves installed on them - the pressure of the safety valve.
Pipelines that are subjected to a strength and density test together with the apparatus must be designed for strength taking into account the pressure of the apparatus being tested.
1.2.4. When calculating the wall thickness of pipelines, the allowance for compensation of corrosive wear to the calculated wall thickness must be selected based on the condition for ensuring the necessary service life of the pipeline in accordance with current regulations on the use of materials in technological processes and corrosion rates.
Depending on the corrosion rate of carbon steels, the media are divided into:
non-aggressive and low-aggressive - with a corrosion rate of up to 0.1 mm / year;
medium aggressive - with a corrosion rate of 0.1 - 0.5 mm / year;
highly aggressive - with a corrosion rate of more than 0.5 mm / year.
1.2.5. When choosing materials and products for pipelines, one should be guided by the requirements of these Rules, as well as the instructions of industry and inter-industry RTDs that establish their assortment, nomenclature, types, basic parameters, conditions of use, etc. In this case, one should take into account:
working pressure and working temperature of the transported medium;
properties of the transported and environment(aggressiveness, explosion and fire hazard, harmfulness, etc.);
properties of materials and products (strength, cold resistance, corrosion resistance, weldability, etc.);
ambient air temperature for pipelines located in the open air or in unheated premises. For the design air temperature when choosing materials and products for pipelines, the average temperature of the coldest five-day period should be taken in accordance with SNiP 2.01.01-82.
1.2.6. For the choice of the pipeline scheme, the correctness of its design, the calculation of strength and the choice of material, for the accepted service life, the quality of manufacture, installation and repair, as well as for the compliance of the pipeline with the requirements of rules, standards and other RTDs, the organizations or enterprises that performed the relevant work are responsible.
1.2.7. All design changes that occur during the manufacture, installation and repair of the pipeline, including the replacement of materials, parts and changes in the category of pipelines, must be carried out by an organization licensed by the Gosgortekhnadzor of Russia for the right to design pipelines.
1.2.8. The organization operating the pipeline (pipeline owner) is responsible full responsibility for the correct and safe operation of the pipeline, control over its operation, for the timeliness and quality of the audit and repair in accordance with these Rules, as well as for the coordination with the author of the project of all changes made to the facility and project documentation.
1.2.9. For pipelines and fittings in contact with explosive and hazardous environments, design organization the estimated service life is established, which should be reflected in project documentation and included in the pipeline passport.
The operation of pipelines that have completed their estimated service life is allowed upon receipt of a technical opinion on the possibility of its further work and permits in the manner prescribed by regulatory documents.
1.2.10. Organizations engaged in the design, manufacture, installation, repair, operation and technical diagnostics of pipelines must have a license from the Gosgortekhnadzor of Russia for the work performed.

2. TECHNOLOGICAL PIPING WITH NOMINAL PRESSURE UP TO 10 MPa (100 kgf/cm)

2.1. Pipeline classification
2.1.1. All pipelines with pressure up to 10 MPa (100 kgf/cm) (inclusive) depending on the hazard class of the transported substance (explosion, fire and harmfulness) are divided into groups (A, B, C) and depending on the operating parameters of the medium (pressure and temperature) - into five categories (I, II, III, IV, V).
The classification of pipelines is given in table. 2.1.
2.1.2. The categories of pipelines determine the set technical requirements imposed on the design, installation and scope of control of pipelines in accordance with these Rules.
2.1.3. The hazard class of technological media is determined by the project developer based on the hazard classes of substances contained in the technological environment and their ratios in accordance with GOST 12.1.007.
2.1.4. Categories of pipelines are established by the project developer for each pipeline and are indicated in the project documentation.
2.1.5. By the decision of the developer, it is allowed, depending on the operating conditions, to take a more responsible (than determined by the operating parameters of the environment) category of pipelines.

2.2. Requirements for materials used for pipelines
2.2.1. Pipes, fittings, flanges, gaskets and fasteners used for steel process pipelines, in terms of quality, technical characteristics and materials, must meet the requirements of these Rules and relevant regulatory and technical documents.
Quality and technical specifications materials and finished products used for the manufacture of pipelines must be confirmed by manufacturers with the appropriate passports or certificates. Materials and products that do not have passports or certificates may be used only for pipelines of category II and below and only after they have been checked and tested in accordance with the standards, specifications and these Rules.
The material of pipeline parts, as a rule, must correspond to the material of the pipes to be connected. When using and welding dissimilar steels, one should be guided by the instructions of the relevant regulatory and technical documents.
It is allowed, upon the conclusion of specialized research organizations, to use pipes and pipeline parts from materials not specified in these Rules.
2.2.2. Pipes and fittings of pipelines must be made of steel with technological weldability, with a ratio of yield strength to tensile strength of not more than 0.75, a relative elongation of the metal at break on five-fold samples of at least 16% and an impact strength of not less than KCU = 30 J / cm (3.0 kgf m/cm) at the minimum temperature of the pipeline element wall during operation.
2.2.3. The use of imported materials and products is allowed if the characteristics of these materials meet the requirements domestic standards and confirmed by the conclusion of a specialized research organization.

Pipes
2.2.4. Pipes, depending on the parameters of the transported medium, must be selected in accordance with Table. 2. 2.
Table 2.1
Classification of pipelines Р10 MPa (100 kgf/cm)

R, MPa (kgf/cm)
t, °С
R, MPa (kgf/cm)
t, °С
R, MPa (kgf/cm)
t, °С
R, MPa (kgf/cm)
t, °С
R, MPa (kgf/cm)
t, °С
1
2
3
4
5
6
7
8
9
10
11
12
A
Substances with a toxic effect

A) extremely and highly hazardous substances of classes 1, 2 (GOST 12.1.007)
Regardless
Regardless
-
-
-
-
-
-
-
-

B) moderately hazardous substances of class 3 (GOST 12.1.007)
Over 2.5 (25)
Over +300 and below -40

-40 to +300
-
-
-
-
-
-

Vacuum below 0.08 (0.8) (abs)
Regardless
-
-
-
-
-
-
-
-
B
Explosive and flammable substances GOST 12.1.044

A) combustible gases (GH), including liquefied gases (LHG)
Over 2.5 (25)
Over +300 and below -40
Vacuum from 0.08 (0.8) (abs) to 2.5 (25)
-40 to +300
-
-
-
-
-
-

Vacuum below 0.08 (0.8) (abs)
Regardless

-
-
-
-
-
-
-
-

B) flammable liquids (flammable liquids)
Over 2.5 (25)
Above +300 and below -40
Over 1.6 (16) to 2.5 (25)
From +120 to +300
Up to 1.6 (16)
-40 to +120
-
-
-
-

Vacuum below 0.08 (0.8) (abs)
Regardless

Vacuum above 0.08 (0.8) (abs)
-40 to +300
-
-
-
-
-
-

C) flammable liquids (GZh)
Over 6.3 (63)
Above +350 and below -40
Over 2.5 (25) to 6.3 (63)
Over +250 to +350
Over 1.6 (16) to 2.5 (25)
Over +120 to +250
Up to 1.6 (16)
-40 to +120
-
-

Same

Vacuum below 0.08 (0.8) (abs)
Same
Vacuum up to 0.08 (0.8) (abs)
-40 to +250
-
-
-
-
IN
Slow-burning (TG) and non-combustible substances (NG) according to GOST 12.1.044
Vacuum below 0.003 (0.03) (abs)
-
Over 6.3 (63) vacuum below 0.08 (0.8) (abs)
Over +350 to +450
Over 2.5 (25) to 6.3 (63)
+250 to +350
Over 1.6 (16) to 2.5 (25)
Over +120 to +250
Up to 1.6 (16)
-40 to +120

Notes. 1. The designation of the group of a certain transported medium includes the designation of the general group of the medium (A, B, C) and the designation of the subgroup (a, b, c), reflecting the hazard class of the transported substance.
2. Designation of the pipeline group in general view corresponds to the designation of the transported medium group. The designation "pipeline of group A (b)" means a pipeline through which a medium of group A (b) is transported.
3. The group of a pipeline transporting media consisting of various components is established according to the component that requires the pipeline to be assigned to a more responsible group. In this case, if the concentration of one of the components in the mixture of dangerous substances of hazard classes 1, 2 and 3 is lethal, the group of the mixture is determined by this substance.
In the event that the most dangerous component in terms of physical and chemical properties is included in the mixture in an insignificant amount, the issue of assigning the pipeline to a less responsible group or category is decided by the design organization (project author).
4. The hazard class of harmful substances should be determined according to GOST 12.1.005 and GOST 12.1.007, the values ​​of the fire and explosion hazard indicators of substances - according to the relevant NTD or the methods set forth in GOST 12.1.044.
5. The category of the pipeline should be set according to the parameter requiring its assignment to a more responsible category.
6. For vacuum pipes, it is not the nominal pressure that should be taken into account, but the absolute working pressure.
7. Pipelines transporting substances with a working temperature equal to or higher than their auto-ignition temperature or a working temperature below minus 40 ° C, as well as those incompatible with water or air oxygen when normal conditions, should be assigned to category I.
Table 2.2
Selection of pipes depending on the parameters of the transported medium

Steel grade, class
Technical
Conditional
Test types
transportable
Limit parameters
strength, standard or specifications (TU)
requirements for pipes (standard, TU)
diameter, mm
and requirements (standard, TU, paragraph of these Rules)
medium (see designations in table 2.1)
Nominal pressure, MPa (kgf/cm)
Maximum temperature, °С
Pipe wall thickness, mm
Minimum temperature depending on the thickness of the pipe wall at stress in the wall from internal pressure

>0.35
0.35
1
2
3
4
5
6
7
8
9
10
Seamless pipes
10, 20
GOST 1050

GOST 550
groups A, B
10 - 300
GOST 550
All environments
10 (100)
450
12
>12
-40
-30
-
-40

GOST 8731

50 - 400

Same
10 (100)
450
12
>12
-40
-30
-40
-40

GOST 8731
group B, made from ingot
50 - 400
Same

10 (100)
450
12
>12
-40
-30
-40
-

GOST 8733
group B
10 - 150
GOST 8733
All media guaranteed hydro-tested
10 (100)
450
6
-40
-40
20
GOST 1050
TU 14-3-826-79
20 - 50
TU 14-3-826-79
All environments
10 (100)
450
12
>12
-40
-30
-40
-40

TU 14-3-1486-87
300, 350, 400
TU 14-3-1486-87
Same
10 (100)
450
-
-30
-40

TU 14-3-587-77
500
TU 14-3-587-77
All environments
10 (100)
450
-
-30
-40

TU 14-3-460-75
50 - 400
TU 14-3-460-75
Same
10 (100)
450
-
-30
-40

TU 14-3-1577-88
50 - 400
TU 14-3-1577-88
"
10 (100)
450
12
>12
-40
-30
-40
-40

TU 14-3-1128-82
50 - 350
TU 14-3-1128-82
"
10 (100)
450
12
>12
-40
-30
-60
-40
10G2
GOST 4543

GOST 550
groups A, B
10 - 300
GOST 550
"
10 (100)
450
6
Over 6 to 12

70
-60
-
-70

12
-40
-60

TU 14-3-826-79
20 - 50
TU 14-3-826-79
"
10 (100)
450
6
Over 6 to 12
-70
-60
-
-70

GOST 8733
group B
10 - 50
GOST 8733 with hydrotest guarantee
"
10 (100)
450
6
-70
-70

GOST 8731
group B, except for those made from ingot

50 - 400
GOST 8731 with hydrotest guarantee

"
10 (100)
450
12
>12
-50
-40
-60
-
10G2
TU 14-3-1577-88
TU 14-3-1577-88
50 - 350
TU 14-3-1577-88
"
10 (100)
450
6
Over 6 to 12
-70
-60
-70
-70

12
-40
-60
09G2S
GOST 19281
TU 14-3-1128-82
50 - 350
TU 14-3-1128-82
"
10 (100)
450
-
-70
-70
15XM
TU 14-3-460-75
TU 14-3-460-75
50 - 400
TU 14-3-460-75
"
10 (100)
560
-
-40
-40
12X1MF,
15X1M1F
GOST 20072

TU 14-3-460-75
50 - 400
TU 14-3-460-75
"
10 (100)
560
-
-20
-40
15X5M,
15X5M-U
GOST 20072

GOST 550
groups A, B
20 - 400
GOST 550
"
10 (100)
600
-
-40
-40
15X5M,
15X5M-U
GOST 20072

TU 14-3-1080-81
350, 450, 500
TU 14-3-1080-81
All environments
10 (100)
600
-
-40
-40
20YCH
TU 14-3-1652-89
TU 14-3-1652-89
20 - 80
TU 14-3-1652-89
Same
10 (100)
450
6

60
-40
-60
-40
10X2M1
GOST 550
GOST 550
groups A, B
50 - 300
GOST 550
"
10 (100)
600
-
-40
-40
X9M
TU 14-3-457-76
TU 14-3-457-76
50 - 300
TU 14-3-457-76
"
10 (100)
600
-
-40
-40
10X17H13M2T
GOST 5632
GOST 9940
GOST 9941
50 - 300
10 - 200
GOST 9940
GOST 9941
"
10 (100)
700
-
-196
-
08X18H10T
GOST 5632
GOST 9940
GOST 9941
50 - 300
10 - 200
GOST 9940
GOST 9941
"
10 (100)
610
-
-253
-

TU 14-3-218-80
10 - 80
TU 14-3-218-80
"
10 (100)
610
-
-253
-
12X18H10T
GOST 5632
GOST 9940
GOST 9941
50 - 300
10 - 200
GOST 9940
GOST 9941
"
5 (50)
700
-
-253
-

GOST 9941
GOST 9940
10 - 200
50 - 300
GOST 9941
GOST 9940
"
10 (100)
610
-
-253
-
12X18X12T
GOST 5632
TU 14-3-796-78
10 - 50
TU 14-3-796-78
"
10 (100)
610
-
-253
-
12X18H12T
TU 14-3-460-75
TU 14-3-460-75
50 - 400
TU 14-3-460-75
"
10 (100)
610
-
-253
-253
08Х18Н12Т
GOST 5632
TU 14-3-743-78
350 - 400
TU 14-3-743-78
"
10 (100)
610
-
-253
-
Electric welded pipes

20
GOST 1050
GOST 20295
150 - 800

Media groups A (b), B (a), B (b), except for SUG
2,5 (25)

400
-20
-40

1,6 (16)
400
12
-20
-40

GOST 20295
150 - 800
GOST 20295, taking into account the requirements of clause 2.2.10
Environments of groups B(c), C
>2,5 (25)

400
-20
-40

2,5 (25)
400
12
-20
-40
20
GOST 1050

GOST 20295
500 - 800

Media group A (a) and LPG
2,5 (25)

200
-20
-40

1,6 (16)
200
12
-20
-40

GOST 10705 group B
10 - 500
GOST 10705 subject to the requirements of clause 2.2.10
Media groups A (b), B, except for LPG
2,5 (25)
300
12
-20
-30

TU 14-3-377-87
200 - 400
TU 14-3-377-87 subject to the requirements of clause 2.2.10
Group B media other than steam and hot water
2,5 (25)
350
-
-40
-
K52
GOST 20295
GOST 20295
150 - 800
GOST 20295, taking into account the requirements of clause 2.2.10
Wednesdays. groups A (b), B (a), B (b), B (c), except for SUG
4 (40)
400
-20
-40

GOST 20295
500 - 800
GOST 20295, taking into account the requirements of clause 2.2.6
Media group A(a), LPG
2,5 (25)
200
-20
-40
VSt3sp5
GOST 380
GOST 10705 group B
10 - 500
GOST 10705
Environments of groups B, C
1,6 (16)
300
200

6
> 6
-20
0
-30
-20

GOST 10705 group B
10 - 500

GOST 10705 without taking into account the requirements of clause 2.2.10
Group B media other than steam and hot water
1,6 (16)
200
12
0
-20

GOST 10706 group B
400 - 1400
GOST 10706
Group B media
2,5 (25)
300
12
-20
-20

GOST 10706 group B
400 - 1400
GOST 10706
Group B media, except LPG
1,6 (16)
200
12
-20
-20
VstZsp4-5 GOST 380
TU 14-3-1399-86
200, 350
TU 14-3-1399-86
All media except group A (a) and LPG
1,6 (16)
300
10
-20
-30

TU 14-3-377-87
200 - 400
TU 14-3-377-87
Group B media other than steam and hot water
1,6 (16)
300
-
-30
-40
VSTZps4
VSTZsp4
GOST 380
GOST 10706 group B
400 - 1400
GOST 10706
Group B media, except LPG
1,6 (16)
200
6 - 9
-20
-40
17G1S-U
TU 14-3-1138-82
TU 14-3-1138-82
1200
TU 14-3-1138-82 subject to the requirements of clause 2.2.10

2,5 (25)
400
12
-40
-40
17G1S-U
TU 14-3-1424-86
TU 14-3-1424-86
1000

All media except group A(a) and LPG
2,5 (25)
400
12
-40
-40
17GS,
17G1S
TU 14-1-1921-76
TU 14-3-620-77
500, 700, 800, 1000, 1200
TU 14-3-620-77
Environments of groups B, C, except for LPG
1,6 (16)
300
12
-40
-50

13G2AF
TU 14-3-1424-86
TU 14-3-1424-86
1000
TU 14-3-1424-86 subject to the requirements of clause 2.2.10
All media except group A(a) and LPG
2,5 (25)
400
12
-60
-60
12G2S
14HGS
TU 14-3-1209-86
TU 14-3-1209-86
600
TU 14-3-1209-86

1,6 (16)
250
12
-40
-40
12X18H10T
10X18H10T
10X18H12T
0018H10T
10Х17Н1ЗМ2Т
GOST 5632
GOST 11068
10 - 100

GOST 11068 subject to the requirements of clause 2.2.10
All media except group A(a) and LPG
2,5 (25)
600
-
-196
-
Electrowelded spiral pipes
10, 20
GOST 1050
GOST 3262
6 - 150
GOST 3262
Group B media other than steam and hot water
1,6 (16)
200
5
-20
-20
20
GOST 1050
GOST 8696
group B
500 - 1400
GOST 8696
Group B media other than steam and hot water
1,6 (16)
200
6
>6
-20
0
-20
-

TU 14-3-684-77
500 - 1400
TU 14-3-684-77
Group B media other than steam and hot water
1,6 (16)
200
12
-40
-40

TU 14-3-808-78
500 - 1600
TU 14-3-808-78
Environments of groups B, C, except for LPG
2,5 (25)
350
12
-40
-30
-40
-40
K50, K52
GOST 20295
GOST 20295
150 - 800
GOST 20295, taking into account the requirements of clause 2.2.10
All media except group A(a) and LPG
2,5 (25)
400
6
>6
-50
-40
-60
-50

GOST 20295
500 - 800
GOST 20295, taking into account the requirements of clause 2.2.6
Media group A(a) and LPG
2,5 (25)
200
6
-40
-
K42
GOST 20295
GOST 20295
150 - 800
GOST 20295, taking into account the requirements of clause 2.2.10
Environments of groups B, C, except for LPG
2,5 (25)
300
-
-30
-
WStZspZ
VSTZsp2
VSTZps2
GOST 380
TU 14-3-943-80
200 - 500
TU 14-3-943-80
All media except group A and LPG
1,6 (16)
300
6
12
-30
-20
-
-
St3sp5
GOST 380
TU 14-3-954-80
500 - 1400
TU 14-3-954-80 subject to the requirements of clause 2.2.10
All media except group A(a) and LPG
2,5 (25)
300
12
-20
-20
09G2FB
TU 14-3-1363-85
TU 14-3-1363-85
1400
TU 14-3-1363-85 subject to the requirements of clause 2.2.10
Environments of groups B, C, except for LPG
7,5 (75)
350
-
-60
-

2.2.5. Seamless pipes made from ingots, as well as fittings from these pipes, are allowed to be used for pipelines of groups A and B of the first and second categories, provided that they are controlled by ultrasonic flaw detection (USD) in a volume of 100% over the entire surface.
2.2.6. For pipelines transporting liquefied hydrocarbon gases (LHG), as well as substances belonging to group A (a), seamless hot- and cold-formed pipes should be used in accordance with GOST 8731, GOST 550, GOST 9940, GOST 9941 and special specifications. It is allowed to use electric-welded pipes with a nominal diameter of more than 400 mm in accordance with the instructions in Table. 2.2 for pipelines transporting substances belonging to group A (a) and liquefied hydrocarbon gases (LPG) at a metal corrosion rate of up to 0.1 mm / year, with an operating pressure of up to 2.5 MPa (25 kgf / cm ) and a temperature of up to 200°C, heat treated, 100% control welds(ultrasound or transillumination) with positive results of mechanical testing of specimens from welded joints in full, including impact strength (KCU).
It is allowed to use as pipes shells made of sheet steel in accordance with the Rules for the Design and Safe Operation of Pressure Vessels for conditional pressure up to 2.5 MPa (25 kgf/cm).
2.2.7. For pipelines, pipes with normalized chemical composition And mechanical properties metal (group B).
2.2.8. Pipes must be tested at the manufacturer's factory with a test hydraulic pressure specified in the normative and technical documentation for pipes, or have an indication in the certificate of the guaranteed value of the test pressure.
Note. It is allowed not to carry out hydrotesting of seamless pipes if they were subjected to control over the entire surface non-destructive methods according to the NTD for pipes.
2.2.9. Electric-welded pipes with a spiral seam may only be used for straight sections of pipelines.
2.2.10. Electric-welded pipes used for transporting substances of groups A (b), B (a), B (b) (see Table 2.1), with the exception of liquefied gases with a pressure of over 1.6 MPa (16 kgf / cm) and groups B ( c) and B at pressures above 2.5 MPa (25 kgf/cm), as well as with operating temperatures above 300°C, must be in a heat-treated state, and their welds are subjected to 100% control physical methods(SPL or transillumination) and bend or impact test.
It is allowed to use non-heat-treated pipes with a ratio of the outer diameter of the pipe to the wall thickness equal to or more than 50 for the transportation of media that do not cause corrosion cracking of the metal.
2.2.11. Electric-welded pipes in contact with a medium that causes corrosion cracking of the metal, regardless of pressure and wall thickness, must be in a heat-treated state, and their welds are of equal strength to the base metal and subjected to 100% control by physical methods (ultrasound or transillumination).
2.2.12. Pipes made of carbon semi-quiet steel according to GOST 380 are allowed to be used for group B environments with a wall thickness of not more than 12 mm in areas with an estimated outdoor air temperature of at least minus 30 ° C, while ensuring that the temperature of the pipeline wall during operation is not lower than minus 20 ° C.
Carbon boiling steel pipes are allowed to be used for group B media with a wall thickness of not more than 8 mm and a pressure of not more than 1.6 MPa (16 kgf / cm) in areas with an estimated air temperature of at least minus 10 ° C.

flanges
2.2.13. Flanges and materials for them should be selected according to the NTD for flanges, taking into account the operating parameters of the medium. For highly aggressive environments and environments with temperatures that are not covered by these documents, the flange material is selected in accordance with the recommendations of specialized research organizations.
2.2.14. Flat welded flanges are allowed to be used for pipelines operating at a nominal pressure of not more than 2.5 MPa (25 kgf / cm) and an ambient temperature of not more than 300 ° C. For pipelines of groups A and B with a nominal pressure of up to 1 MPa (10 kgf/cm), flanges provided for a nominal pressure of 1.6 MPa (16 kgf/cm) must be used.
2.2.15. For pipelines operating at nominal pressures above 2.5 MPa (25 kgf/cm), regardless of temperature, as well as for pipelines with operating temperatures above 300°C, regardless of pressure, only butt-welded flanges should be used.
2.2.16. Butt-weld flanges must be made from forgings or shroud blanks.
It is allowed to manufacture butt-welded flanges by rolling blanks along the plane of the sheet for pipelines operating at a nominal pressure of not more than 2.5 MPa (25 kgf / cm), or bending forged strips for pipelines operating at a nominal pressure of not more than 6.3 MPa (63 kgf / cm), subject to the control of welds by radiographic or ultrasonic method in the amount of 100%.
2.2.17. When choosing the type of sealing surface of flanges (Fig. 1) according to GOST 12815 for connecting pipelines, depending on the transported medium and pressure, it is necessary to be guided by the recommendations given in Table. 2.3.

Rice. 1. Sealing surfaces of valve flanges
and connecting parts of pipelines:
a - smooth; b - under the lens gasket; in - under the ring gasket
oval section; g - protrusion - depression; d - spike - groove.
Table 2.3
Selection of the type of flange sealing surface

2,5 (25)
Smooth

All substances of groups A, B, cr...