Snip 42 01 02 gas distribution systems status. Updated edition of sp. Gas pipelines crossing water barriers and ravines

System of regulatory documents in construction

BUILDING STANDARDS AND RULES OF THE RUSSIAN FEDERATION

GAS DISTRIBUTION SYSTEMS

SNiP 42-01-2002

STATE COMMITTEE OF THE RUSSIAN FEDERATION
ON CONSTRUCTION AND HOUSING AND COMMUNAL COMPLEX
(GOSSTROY RUSSIA)

Moscow
2003

PREFACE

1 DEVELOPED by a team of leading specialists from JSC GiproNIIgaz, JSC MosgazNIIproekt, JSC Nadezhnost, JSC Rosgazifikatsiya, JSC Zapsibgazprom, JSC VNIIST, Gosgortekhnadzor of Russia, Gosstroy of Russia and a number of gas distribution facilities of Russia with the coordination of JSC Polymergaz »

2 INTRODUCED by the Department of Standardization, Technical Regulation and Certification of the Gosstroy of Russia

3 ADOPTED AND ENTERED INTO EFFECT on July 1, 2003 by Decree of the State Construction Committee of Russia dated December 23, 2002 No. 163

INTRODUCTION

Type of gas transported

Working pressure in the gas pipeline MPa

High

Icategories

Natural

St. 0.6 to 1.2 inclusive

LPG

St. 0.6 to 1.6 inclusive

IIcategories

Natural and LPG

St. 0.3 to 0.6 inclusive

Average

Same

St. 0.005 to 0.3 inclusive

Low

Up to 0.005 inclusive

4.4 The gas pressure in internal gas pipelines and in front of gas-using installations must correspond to the pressure required for stable operation of these installations, specified in the technical data sheets of the manufacturers, but must not exceed the values given in the table.

table 2

	Gas pressure, MPa
1. Industrial buildings in which the gas pressure is determined by production requirements	1,2
2. Other industrial buildings	0,6
3. Domestic buildings of industrial enterprises, separate, attached to industrial buildings and built into these buildings	0,3
4. Administrative buildings	0,005
5. Boiler rooms:
separately standing on the territory of production enterprises	1,2
the same, on the territory of settlements	0,6
attached, built-in and roof-top industrial buildings	0,6
attached, built-in and rooftop public, administrative and domestic buildings	0,3
attached, built-in and rooftop residential buildings	0,005
6. Public buildings (except for buildings in which the installation of gas equipment is requiredSNiP 2.08.02 not allowed) and warehouse	0,005
7. Residential buildings	0,003

4.5 Gas distribution networks, tank and cylinder installations, gas filling stations and other LPG facilities must be designed and built in such a way that, when accepting the loads and impacts acting on them during the expected service life, which may be established by the design assignment, the necessary safety conditions are ensured their strength, stability and tightness. Temperature and other deformations of gas pipelines (including from soil movements), which can lead to violations of their integrity and tightness, are not allowed.

The choice of the method of laying and material of pipes for the gas pipeline at the exit from the gas distribution station should be taken into account the heaving of the soil and other hydrogeological conditions, as well as taking into account the temperature of the gas supplied from the gas distribution station.

4.6 Calculation of gas pipelines for strength should include determination of the thickness of the pipe walls and connecting parts and the stresses in them. At the same time, for underground and above-ground steel gas pipelines, pipes and connecting parts with a wall thickness of at least 3 mm should be used, for above-ground and internal gas pipelines - at least 2 mm.

Characteristics of limit states, safety factors for responsibility, standard and design values of loads and impacts and their combinations, as well as standard and design values of material characteristics should be taken into account in calculations taking into account the requirements of GOST 27751 and SNiP 2.01.07.

4.7 When constructing in areas with difficult geological conditions and seismic impacts, the special requirements of SNiP II-7, SNiP 2.01.15, SNiP 2.01.09 must be taken into account and measures must be taken to ensure the strength, stability and tightness of gas pipelines.

4.8 Steel gas pipelines must be protected from corrosion.

Underground and above-ground steel gas pipelines, LPG tanks, steel inserts of polyethylene gas pipelines and steel casings on gas pipelines (hereinafter referred to as gas pipelines) should be protected from soil corrosion and corrosion by stray currents in accordance with the requirements of GOST 9.602.

Steel casings of gas pipelines under roads, railways and tram tracks during trenchless installation (puncture, punching and other technologies permitted for use) must, as a rule, be protected by electrical protection means (EP), and when laid in an open way - with insulating coatings and ECP.

Overhead and internal steel gas pipelines should be protected from atmospheric corrosion in accordance with the requirements of SNiP 2.03.11.

4.9 Gas distribution systems of settlements with a population of more than 100 thousand people. must be equipped with automated systems for remote control of the technological process of gas distribution and commercial metering of gas consumption (APCS RG). For settlements with a population of less than 100 thousand people. The decision to equip the gas distribution systems of automated process control systems of the DG is made by the operating organizations or the customer.

4.10. For the construction of gas distribution systems, materials, products, gas-using and gas equipment must be used in accordance with current standards and other regulatory documents for their supply, service life, characteristics, properties and purpose (areas of application) of which, established by these documents, correspond to the conditions of their operation.

The suitability for use in the construction of gas distribution systems of new materials, products, gas-using and gas equipment, including foreign production, in the absence of regulatory documents for them, must be confirmed in the prescribed manner by a technical certificate from the Gosstroy of Russia.

4.11 For underground gas pipelines, polyethylene and steel pipes should be used. Steel pipes should be used for ground and above-ground gas pipelines. For internal low-pressure gas pipelines, it is allowed to use steel and copper pipes.

Seamless steel, welded (straight-seam and spiral-seam) pipes and connecting parts for gas distribution systems must be made of steel containing no more than 0.25% carbon, 0.056% sulfur and 0.046% phosphorus.

The choice of pipe material, pipeline shut-off valves, connecting parts, welding materials, fasteners and others should be made taking into account gas pressure, diameter and wall thickness of the gas pipeline, the design temperature of the outside air in the construction area and the temperature of the pipe wall during operation, soil and natural conditions, presence of vibration loads.

4.12 The value of the impact strength of metal pipes and connecting parts with a wall thickness of 5 mm or more must be not lower than 30 J/cm2 for gas pipelines laid in areas with a design temperature below minus 40 ° C, as well as (regardless of the construction area) for gas pipelines:

pressure over 0.6 MPa, diameter over 620 mm;

underground, laid in areas with seismicity over 6 points;

experiencing vibration loads;

underground, laid in special soil conditions (except for slightly heaving, slightly swelling, subsidence Type I);

at crossings through natural barriers and at intersections with railways of the general network and roads I - III categories.

In this case, the value of the impact strength of the base metal of pipes and connecting parts should be determined at a minimum operating temperature.

4.13 Welded pipe joints in gas pipelines must correspond in their physical and mechanical properties and tightness to the base material of the pipes being welded. The types, design elements and dimensions of welded joints must comply with current standards. For steel underground gas pipelines, butt and corner joints should be used, for polyethylene - butt joints with a heated tool or using parts with embedded electric heaters (ZN). The seams should not have cracks, burns, unwelded craters, as well as edge displacements, lack of fusion, inclusions, pores, misalignment of pipes and other defects that reduce the mechanical properties of welded joints that are unacceptable in accordance with the requirements of regulatory documents or the design.

Each welded joint of external gas pipelines must have the designation (number, mark) of the welder who made this connection.

Placing welded joints in walls, ceilings and other structures of buildings and structures is not permitted.

4.14 The tightness of pipeline shut-off and control valves (valves and gate valves) with a nominal bore of up to 80 mm installed on gas pipelines with natural gas must be at least class B, over 80 mm - not lower than class C, and the tightness of valves installed on liquid gas pipelines LPG phase must be at least class A according to GOST 9544.

4.15 The construction and reconstruction of gas distribution systems should be carried out in accordance with the project approved in the prescribed manner, as well as taking into account SNiP 3.01.01.

When designing and constructing gas distribution systems, environmental protection measures should be taken in accordance with current legislation.

The boundaries of security zones of gas distribution networks and the conditions for the use of land plots located within them must comply with the Rules for the protection of gas distribution networks approved by the Government of the Russian Federation.

4.16 The performance and operational safety of gas distribution systems must be maintained and preserved by carrying out maintenance and repairs in accordance with operational documentation, technical regulations, Safety Rules in the gas industry, approved by the State Technical Supervision Authority of Russia, and other documents.

5 EXTERNAL GAS PIPELINES

5.1 GENERAL PROVISIONS

5.1.1 The placement of external gas pipelines in relation to buildings, structures and parallel neighboring utility networks should be carried out in accordance with the requirements of SNiP 2.07.01, and on the territory of industrial enterprises - SNiP II-89.

When laying underground gas pipelines with a pressure of up to 0.6 MPa in cramped conditions (when it is not possible to comply with the distances regulated by regulatory documents), in certain sections of the route, between buildings and under the arches of buildings, as well as gas pipelines with a pressure of over 0.6 MPa when approaching they with detached ancillary buildings (buildings without permanent presence of people) are allowed to be reduced to 50% of the distance specified in SNiP 2.07.01 and SNiP II-89. In this case, in areas of approach and at a distance of at least 5 m in each direction from these areas, the following should be used:

seamless or electric-welded steel pipes laid in a protective case, with 100% physical control of factory welded joints;

polyethylene pipes laid in a protective case, without welded joints or connected by parts with embedded heaters (ZH), or connected by butt welding with 100% control of the joints by physical methods.

When laying gas pipelines at distances corresponding to SNiP 2.07.01, but less than 50 m from public railways in the approach area and 5 m in each direction, the laying depth must be at least 2.0 m. Butt welded joints must pass 100% - nal control by physical methods.

In this case, the wall thickness of steel pipes should be 2-3 mm greater than the calculated one, and polyethylene pipes should have a safety factor of at least 2.8.

5.1.2 The laying of gas pipelines should be provided underground and above ground.

In justified cases, it is allowed to lay gas pipelines above ground along the walls of buildings inside residential courtyards and neighborhoods, as well as in certain sections of the route, including sections of transitions through artificial and natural barriers when crossing underground communications.

Above-ground and above-ground gas pipelines with embankment can be laid in rocky, permafrost soils, wetlands and other difficult soil conditions. The material and dimensions of the embankment should be taken based on thermal engineering calculations, as well as ensuring the stability of the gas pipeline and embankment.

5.1.3 Laying gas pipelines in tunnels, collectors and canals is not permitted. An exception is the laying of steel gas pipelines with a pressure of up to 0.6 MPa in accordance with the requirements of SNiP II-89 on the territory of industrial enterprises, as well as in channels in permafrost soils under roads and railways.

5.1.4 Pipe connections should be permanent. Connections between steel pipes and polyethylene pipes can also be detachable in places where fittings, equipment and instrumentation are installed. Detachable connections of polyethylene pipes with steel pipes in the ground can only be provided if a case with a control tube is installed.

5.1.5 Gas pipelines at points of entry and exit from the ground, as well as gas pipeline entries into buildings, should be enclosed in a case. The space between the wall and the case should be sealed to the full thickness of the structure being crossed. The ends of the case should be sealed with elastic material.

5.1.6 Gas pipeline entries into buildings should be provided directly into the room where gas-using equipment is installed, or into an adjacent room connected by an open opening.

It is not allowed to enter gas pipelines into the premises of the basement and ground floors of buildings, except for the introduction of natural gas pipelines into single-family and semi-detached houses.

5.1.7 Shut-off devices on gas pipelines should be provided:

in front of detached or blocked buildings;

to disconnect risers of residential buildings above five floors;

in front of outdoor gas-using equipment;

in front of gas control points, with the exception of gas distribution points of enterprises, on the gas pipeline branch to which there is a shut-off device at a distance of less than 100 m from the gas distribution point;

at the exit from gas control points connected by gas pipelines;

on branches from gas pipelines to settlements, individual microdistricts, blocks, groups of residential buildings, and when the number of apartments is more than 400, to a separate house, as well as on branches to industrial consumers and boiler houses;

when crossing water barriers with two lines or more, as well as with one line when the width of the water barrier at a low-water horizon is 75 m or more;

at the intersection of railways of the general network and highways I - II categories, if the shut-off device ensuring the cessation of gas supply at the crossing site is located at a distance from roads of more than 1000 m.

5.1.8 Shut-off devices on above-ground gas pipelines laid along the walls of buildings and on supports should be placed at a distance (in radius) from door and opening window openings of at least:

for low pressure gas pipelines - 0.5 m;

for medium pressure gas pipelines - 1 m;

II category - 3 m;

for high pressure gas pipelines I category - 5 m.

In areas of transit laying of gas pipelines along the walls of buildings, the installation of disconnecting devices is not allowed.

5.2 UNDERGROUND GAS PIPELINES

5.2.1 Gas pipelines should be laid at a depth of at least 0.8 m to the top of the gas pipeline or casing. In places where traffic and agricultural machinery are not expected, the depth of laying steel gas pipelines can be at least 0.6 m.

5.2.2 The vertical (clear) distance between the gas pipeline (case) and underground utilities and structures at their intersections should be taken taking into account the requirements of the relevant regulatory documents, but not less than 0.2 m.

5.2.3 At places where gas pipelines intersect with underground communication manifolds and channels for various purposes, as well as at places where gas pipelines pass through the walls of gas wells, the gas pipeline should be laid in a case.

The ends of the casing must be brought out at a distance of at least 2 m on both sides from the outer walls of the crossed structures and communications, when crossing the walls of gas wells - at a distance of at least 2 cm. The ends of the casing must be sealed with waterproofing material.

At one end of the case at the top point of the slope (with the exception of places where the walls of the wells intersect), a control tube should be provided that extends under the protective device.

In the interpipe space of the casing and the gas pipeline, it is permitted to lay an operational cable (communications, telemechanics and electrical protection) with a voltage of up to 60 V, intended for servicing gas distribution systems.

5.2.4 Polyethylene pipes used for the construction of gas pipelines must have a safety factor in accordance with GOST R 50838 of at least 2.5.

It is not allowed to lay gas pipelines from polyethylene pipes:

on the territory of settlements at pressure above 0.3 MPa;

outside the territory of settlements at pressure above 0.6 MPa;

for transporting gases containing aromatic and chlorinated hydrocarbons, as well as the liquid phase of LPG;

when the temperature of the gas pipeline wall under operating conditions is below minus 15 °C.

When using pipes with a safety factor of at least 2.8, it is permitted to lay polyethylene gas pipelines with pressures exceeding 0.3 to 0.6 MPa in settlements with predominantly one- to two-story and cottage residential buildings. In the territory of small rural settlements, it is permitted to lay polyethylene gas pipelines with a pressure of up to 0.6 MPa with a safety factor of at least 2.5. In this case, the laying depth must be at least 0.8 m to the top of the pipe.

5.3 OVERGROUND GAS PIPELINES

5.3.1 Depending on the pressure, above-ground gas pipelines should be laid on supports made of non-combustible materials or along the structures of buildings and structures in accordance with the table.

Table 3

	Gas pressure in the gas pipeline, MPa, no more
1 On free-standing supports, columns, trestles and shelves	1.2 (for natural gas); 1.6 (for LPG)
2 Boiler houses, industrial buildings with premises of categories B, G and D and buildings of the State Tax Service (GNP), public and domestic buildings for industrial purposes, as well as built-in, attached and roof boiler houses to them:
a) on the walls and roofs of buildingsIAndIIdegrees of fire resistance of fire hazard class CO (according toSNiP 21-01 )	1,2*
IIfire resistance class C1 andIII	0,6*
b) along the walls of buildingsIIIdegree of fire resistance class C1,IVdegree of fire resistance class CO	0,3*
IVfire resistance classes C1 and C2	0,005
3. Residential, administrative, public and domestic buildings, as well as built-in, attached and roof boiler houses to them
on the walls of buildings of all degrees of fire resistance	0,005
in cases where the SHRP is placed on the external walls of buildings (only up to the SHRP)	0,3
* Gas pressure in the gas pipeline laid along building structures should not exceed the values indicated in the table for relevant consumers

5.3.2 Transit laying of gas pipelines of all pressures along the walls and over the roofs of buildings of children's institutions, hospitals, schools, sanatoriums, public, administrative and domestic buildings with large numbers of people is not allowed.

It is prohibited to lay gas pipelines of all pressures along the walls, above and below rooms of categories A and B, determined by fire safety standards, with the exception of GRP buildings.

In justified cases, transit laying of gas pipelines not exceeding average pressure with a diameter of up to 100 mm along the walls of one residential building is permitted III degree of fire resistance class CO and at a distance to the roof of at least 0.2 m.

5.3.3 High-pressure gas pipelines should be laid along blank walls and sections of walls or at least 0.5 m above the window and door openings of the upper floors of industrial buildings and adjacent administrative and domestic buildings. The distance from the gas pipeline to the roof of the building must be at least 0.2 m.

Low and medium pressure gas pipelines can also be laid along the frames or mullions of non-opening windows and cross window openings of industrial buildings and boiler houses filled with glass blocks.

5.3.4 The height of laying overhead gas pipelines should be taken in accordance with the requirements of SNiP II-89.

5.3.5 On pedestrian and automobile bridges built from non-combustible materials, it is permitted to lay gas pipelines with a pressure of up to 0.6 MPa from seamless or electric-welded pipes that have undergone 100% control of factory welded joints by physical methods. Laying gas pipelines over pedestrian and automobile bridges built from flammable materials is not permitted.

5.4 CROSSING GAS PIPELINES WITH WATER OBSTACLES AND ROVIES

5.4.1 Underwater and overwater gas pipelines where they cross water barriers should be placed at a horizontal distance from bridges in accordance with the table.

Table 4

	Bridge type	The horizontal distance between the gas pipeline and the bridge, not less than m, when laying the gas pipeline
		above the bridge				below the bridge
		from an overwater gas pipeline with a diameter, mm		from an underwater gas pipeline with a diameter, mm		from the overwater gas pipeline	from an underwater gas pipeline
		300 or less	over 300	300 or less	over 300	all diameters
Shipping freezing	All types		125		125
Shipping anti-freeze	Same
Non-navigable freezing	Multi-span		125		125
Non-navigable anti-freeze
Non-navigable pressure gas pipelines:	Single and double span
low
medium and high
*Note* - Distances are from protruding bridge structures

5.4.2 Gas pipelines at underwater crossings should be laid deep into the bottom of the water barriers being crossed. If necessary, based on the results of floating calculations, it is necessary to ballast the pipeline. The elevation of the top of the gas pipeline (ballast, lining) must be at least 0.5 m, and at crossings through navigable and floating rivers - 1.0 m below the predicted bottom profile for a period of 25 years. When carrying out work using directional drilling - no less than 2.0 m below the predicted bottom profile.

5.4.3 At underwater crossings the following should be used:

steel pipes with a wall thickness 2 mm greater than the calculated one, but not less than 5 mm;

polyethylene pipes having a standard dimensional ratio of the outer diameter of the pipe to the wall thickness ( SDR ) no more than 11 (according to GOST R 50838) with a safety factor of no less than 2.5 for crossings up to 25 m wide (at the level of maximum water rise) and no less than 2.8 in other cases.

When laying a gas pipeline with a pressure of up to 0.6 MPa using directional drilling, polyethylene pipes with a safety factor of at least 2.5 can be used in all cases.

5.4.4 The height of laying the above-water passage of the gas pipeline from the calculated level of water rise or ice drift according to SNiP 2.01.14 (high water horizon - GVV or ice drift - GVL) to the bottom of the pipe or span should be taken:

at the intersection of ravines and gullies - not lower than 0.5 m above the GVV of 5% security;

when crossing non-navigable and non-raftable rivers - at least 0.2 m above the water supply line and water line of 2% probability, and if there is a grub boat on the rivers - taking it into account, but not less than 1 m above the water supply line of 1% probability;

when crossing navigable and raftable rivers - no less than the values established by design standards for bridge crossings on navigable rivers.

Shut-off valves should be placed at a distance of at least 10 m from the transition boundaries. The transition boundary is considered to be the place where the gas pipeline crosses the high water horizon with a 10% probability.

5.5 CROSSING GAS PIPELINES WITH RAILWAY, TRAM TRACKS AND HIGHWAYS

5.5.1 The horizontal distances from the places where underground gas pipelines intersect tramways, railways and highways must be no less than:

to bridges and tunnels on public railways, tramways, roads I - III categories, as well as to pedestrian bridges, tunnels through them - 30 m, and for non-public railways, highways IV - V categories and pipes - 15m;

to the turnout zone (the beginning of the points, the tail of the crosses, the points where suction cables are connected to the rails and other track intersections) - 4 m for tram tracks and 20 m for railways;

to the contact network supports - 3 m.

It is permitted to reduce these distances in agreement with the organizations in charge of the crossed structures.

5.5.2 Underground gas pipelines of all pressures at intersections with railways, tramways, and roads I - IV categories, as well as main streets of citywide importance should be laid in cases. In other cases, the issue of the need to install cases is decided by the design organization.

Cases must meet the conditions of strength and durability. At one end of the case there should be a control tube extending under the protective device.

5.5.3 The ends of the casings when crossing gas pipelines of public railways should be placed at a distance from them not less than those established by SNiP 32-01. When laying inter-settlement gas pipelines in cramped conditions and gas pipelines on the territory of settlements, it is allowed to reduce this distance to 10 m, provided that an exhaust candle with a sampling device is installed at one end of the case, placed at a distance of at least 50 m from the edge of the roadbed (the axis of the outer rail on zero marks).

In other cases, the ends of the cases should be located at a distance:

at least 2 m from the outermost rail of tram tracks and 750 mm gauge railways, as well as from the edge of the roadway of streets;

at least 3 m from the edge of the road drainage structure (ditch, ditch, reserve) and from the outermost rail of non-public railways, but not less than 2 m from the base of the embankments.

5.5.4 When gas pipelines cross 1520 mm gauge public railway lines, the gas pipeline laying depth must comply with SNiP 32-01.

In other cases, the depth of laying the gas pipeline from the base of the rail or the top of the road surface, and in the presence of an embankment, from its base to the top of the casing, must meet safety requirements, but be no less than:

when performing open-pit work - 1.0 m;

when carrying out work using the method of punching or directional drilling and shield penetration - 1.5 m;

when performing work using the puncture method - 2.5 m.

5.5.5 The thickness of the walls of steel gas pipeline pipes when crossing public railways should be 2-3 mm greater than the calculated one, but not less than 5 mm at distances of 50 m in each direction from the edge of the roadbed (the axis of the outer rail at zero marks).

For polyethylene gas pipelines in these sections and at highway intersections I - III categories, polyethylene pipes should be used no more SDR 11 with a safety factor of at least 2.8.

5.6 ADDITIONAL REQUIREMENTS FOR GAS PIPELINES IN SPECIAL NATURAL AND CLIMATIC CONDITIONS

5.6.1 Gas supply to cities with a population of more than 1 million people. when the seismicity of the area is more than 6 points, as well as cities with a population of more than 100 thousand people. if the seismicity of the area is more than 7 points, it should be provided from two sources or more - main gas distribution stations with their placement on opposite sides of the city. In this case, high and medium pressure gas pipelines should be designed in a loop with their division into sections by shut-off devices.

5.6.2 Transitions of gas pipelines through rivers, ravines and railway tracks in excavations, laid in areas with seismicity of more than 7 points, must be provided above ground. The structures of the supports must ensure the possibility of movements of gas pipelines that occur during an earthquake.

5.6.3 During the construction of underground gas pipelines in seismic areas, in undermined and karst areas, at intersections with other underground communications, at the corners of turns of gas pipelines with a bend radius of less than 5 diameters, in places where the network branches, transition of underground to above-ground, location of permanent connections "polyethylene - steel”, and also within settlements, control tubes should be installed in linear sections every 50 m.

5.6.4 The depth of laying gas pipelines in soils of varying degrees of heaving, as well as in bulk soils, should be taken to the top of the pipe - at least 0.9 of the standard freezing depth, but not less than 1.0 m.

If the soil is uniformly heaving, the depth of laying the gas pipeline to the top of the pipe should be:

not less than 0.7 standard freezing depth, but not less than 0.9 m for medium heaving soils;

not less than 0.8 standard freezing depth, but not less than 1.0 m for strongly and excessively heaving soils.

5.6.5 For LPG tank installations with underground tanks in heaving (except slightly heaving), medium and highly swelling soils, provision must be made for above-ground laying of liquid and vapor phase gas pipelines connecting the tanks.

5.6.6 If the seismicity of the area is more than 7 points, in undermined and karst areas, in areas of permafrost soils, pipes with a safety factor of at least 2.8 should be used for polyethylene gas pipelines. Welded butt joints must undergo 100% control by physical methods.

5.7 RESTORATION OF WORN OUT UNDERGROUND STEEL GAS PIPELINES

5.7.1 To restore (reconstruct) worn-out underground steel gas pipelines outside and on the territory of urban and rural settlements, the following should be used:

at a pressure of up to 0.3 MPa inclusive, drawing polyethylene pipes in a gas pipeline with a safety factor of at least 2.5 without welded joints or connected using parts with a seal, or connected by butt welding using welding equipment of a high degree of automation;

at a pressure from 0.3 to 0.6 MPa inclusive, stretching polyethylene pipes in a gas pipeline without welded joints or connected using parts with welded joints or butt welding using highly automated welding equipment with a safety factor for gas pipelines in settlements of at least 2, 8, and outside settlements - at least 2.5. The space between the polyethylene pipe and the worn-out steel gas pipeline (frame) along its entire length must be filled with sealing (sealing) material (cement-sand mortar, foam material);

at a pressure of up to 1.2 MPa, lining (using Phoenix technology) the cleaned inner surface of gas pipelines with a synthetic fabric hose using a special two-component glue, subject to confirmation in the prescribed manner of their suitability for these purposes at the specified pressure or in accordance with standards (technical conditions) , the scope of which extends to this pressure.

5.7.2 Restoration of worn-out steel gas pipelines is carried out without changing the pressure, with an increase or decrease in pressure compared to the existing gas pipeline.

In this case, it is allowed to save:

intersections of restored areas with underground utilities without installing additional casings;

depth of installation of restored gas pipelines;

distances from the restored gas pipeline to buildings, structures and utilities according to its actual location, if the pressure of the restored gas pipeline does not change or when the pressure of the restored gas pipeline increases to 0.3 MPa.

Restoring worn-out steel gas pipelines with increasing pressure to high is permitted if the distances to buildings, structures and utilities meet the requirements for a high-pressure gas pipeline.

5.7.3 The ratio of the sizes of polyethylene and steel pipes during reconstruction using the broaching method should be selected based on the possibility of free passage of polyethylene pipes and parts inside steel ones and ensuring the integrity of polyethylene pipes. The ends of the reconstructed sections between the polyethylene and steel pipes must be sealed.

6 GAS REGULATORY POINTS AND INSTALLATIONS

6.1 GENERAL PROVISIONS

To reduce and regulate gas pressure in the gas distribution network, gas control points (GRP) and installations (GRU) are provided.

Factory-made block gas control units can be used in container-type buildings (GRPB) and cabinet-type buildings (SHR).

6.2 REQUIREMENTS FOR PIU AND GRPB

6.2.1 GRP should be placed:

free-standing;

attached to gasified industrial buildings, boiler houses and public buildings with industrial premises;

built into one-story gasified industrial buildings and boiler rooms (except for premises located in the basement and ground floors);

on the coatings of gasified industrial buildings I and II degrees of fire resistance class CO with non-combustible insulation;

Table 5

	Horizontal clear distances from free-standing hydraulic fracturing units, gas regulating stations and free-standing shrp units, m, to
	buildings and structures	railway and tram tracks (to the nearest rail)	highways (to the side of the road)	overhead power lines
Up to 0.6				At least 1.5 support heights
St. 0.6 to 1.2
*Notes* 1 The distance should be taken from the external walls of the GRP, GRPB or ShRP buildings, and when the equipment is located in an open area - from the fence. 2 The requirements of the table also apply to gas flow metering units located in separate buildings or in cabinets on separate supports. 3 The distance from a free-standing ShRP with an inlet gas pressure of up to 0.3 MPa to buildings and structures is not standardized.

outside buildings in open fenced areas under a canopy on the territory of industrial enterprises.

GRPB should be placed separately.

6.2.2 Separate gas control points in settlements must be located at distances from buildings and structures no less than those indicated in the table, and on the territory of industrial enterprises and other industrial enterprises - in accordance with the requirements of SNiP II-89.

In cramped conditions, it is allowed to reduce the distances from buildings and structures to gas control points with a capacity of up to 10,000 m 3 /h by 30%.

6.2.3 Separate buildings of the gas distribution and gas distribution center must be one-story, without basements, with a combined roof and not lower than II degree of fire resistance and CO class for fire hazard according to SNiP 21-01. It is allowed to place the GRPB in container-type buildings (metal frame with fireproof insulation).

6.2.4 GRP can be attached to buildings not lower than II degree of fire resistance class CO with premises of categories G and D according to fire safety standards. Hydraulic fracturing units with gas inlet pressure over 0.6 MPa can be attached to the specified buildings if the use of gas of such pressure is necessary according to the conditions of the technology.

Extensions must be adjacent to buildings on the side of a blank fire wall that is gas-tight within the abutment of the gas distribution point. In this case, the gas tightness of the adjoining seams must be ensured.

The distance from the walls and covering of the attached hydraulic distribution points to the nearest opening in the wall must be at least 3 m.

6.2.5 Built-in hydraulic fracturing units are allowed to be installed at an inlet gas pressure of no more than 0.6 MPa in buildings no lower than II degree of fire resistance class CO with rooms of categories G and D. The room of the built-in gas distribution center must have fire-resistant gas-tight enclosing structures and independent exit to the outside of the building.

6.2.6 The walls separating the GRP and GRPB premises must be fireproof I type according to SNiP 21-01 and gas-tight. The installation of smoke and ventilation ducts in dividing walls, as well as in the walls of buildings to which gas distribution centers are attached (within the borders of the gas distribution center) is not allowed.

Auxiliary premises must have an independent exit to the outside of the building, not connected to the technological room.

The doors of the gas distribution center and gas distribution center should be fireproof and openable outward.

6.2.7 Premises in which reduction units with pressure regulators of free-standing, attached and built-in gas distribution and gas distribution units are located must meet the requirements of SNiP 31-03 and SNiP 21-01.

6.3 REQUIREMENTS FOR SHRP

6.3.1 SHRPs are placed on free-standing supports or on the external walls of buildings for which they are intended to supply gas.

The distances from free-standing SHRPs to buildings and structures must be no less than those indicated in the table. At the same time, for SHRP with gas inlet pressure up to 0.3 MPa inclusive, the distances to buildings and structures are not standardized.

6.3.2 ShRP with inlet gas pressure up to 0.3 MPa is installed:

on the external walls of residential, public, administrative and domestic buildings, regardless of the degree of fire resistance and fire hazard class with gas consumption up to 50 m 3 / h;

on the external walls of residential, public, administrative and domestic buildings not lower than III degree of fire resistance and not lower than class C1 at a gas flow rate of up to 400 m 3 / h.

6.3.3 ShRP with an inlet gas pressure of up to 0.6 MPa are installed on the external walls of industrial buildings, boiler houses, public and domestic buildings for industrial purposes, as well as on the external walls of existing gas distribution plants not lower than III degree of fire resistance class CO.

6.3.4 ShRP with inlet gas pressure above 0.6 to 1.2 MPa are not allowed to be installed on the external walls of buildings.

6.3.5 When installing a ShRP with an inlet gas pressure of up to 0.3 MPa on the external walls of buildings, the distance from the wall of the ShRP to windows, doors and other openings must be at least 1 m, and when the gas pressure at the inlet is over 0.3 to 0.6 MPa - at least 3 m.

6.3.6 It is allowed to place ShRP on coatings with non-flammable insulation of gasified industrial buildings I, II fire resistance class CO on the side of the roof exit at a distance of at least 5 m from the exit.

6.4 REQUIREMENTS FOR GRU

6.4.1 GRU can be located in the room where gas-using equipment is located, as well as directly near thermal installations for supplying gas to their burners.

It is allowed to supply gas from one GRU to thermal units located in other rooms of the same building, provided that these units operate in the same gas pressure conditions and 24-hour access is provided to the rooms where the units are located for personnel responsible for the safe operation of gas equipment.

6.4.2 The number of GRUs placed in one room is not limited. In this case, each GRU should not have more than two control lines.

6.4.3 GRUs can be installed with an inlet gas pressure of no more than 0.6 MPa.

In this case, the GRU are located:

in premises of categories D and D, in which gas-using installations are located, or in adjacent premises of the same categories connected to them by open openings, having ventilation according to the production located in them;

6.4.4 It is not allowed to place the GRU in premises of categories A and B.

6.5 EQUIPMENT FOR GRP, GRU, SHRP AND GRU

6.5.1 GRP, GRPB, ShRP and GRU must be equipped with a filter, a safety shut-off valve (SSV), a gas pressure regulator, a safety relief valve (PSV), shut-off valves, control measuring instruments (instrumentation) and a gas flow metering unit, if necessary, as well as a bypass gas pipeline (bypass) with two disconnecting devices located in series on it.

It is permitted not to provide a bypass device in a ShRP intended for gas supply to a single-family house.

At an inlet pressure of more than 0.6 MPa, hydraulic fracturing or gas distribution units with a gas flow rate of more than 5000 m 3 /h, and self-propelled dispensers with a gas flow rate of more than 100 m 3 / h, must be equipped with two reduction lines instead of a bypass.

6.5.2 When placing part of the shut-off valves, instruments and equipment outside the building of the gas distribution center, gas distribution center or shrp, their operating conditions must be ensured, corresponding to those specified in the manufacturer’s passports. Equipment located outside the building of the gas distribution center, gas distribution center and shrub must be fenced.

6.5.3 Filters installed in the gas distribution unit, gas distribution unit, ShRP and gas distribution unit must have devices for determining the pressure drop in it, which characterizes the degree of clogging of the filter cassette at maximum gas flow.

6.5.4 The PZK and PSK must ensure, respectively, automatic shutdown of the supply or discharge of gas into the atmosphere when the pressure in the gas pipeline changes, unacceptable for the safe and normal operation of gas-using and gas equipment.

6.5.5 In GRP, GRPB, ShRP and GRU, a system of purge and discharge pipelines should be provided for purge of gas pipelines and discharge of gas from the PSK, which are discharged outside to places where safe conditions for gas dispersion are provided.

6.5.6 In the GRP, GRPB, ShRP and GRU, indicating and recording instruments for measuring the inlet and outlet gas pressure, as well as its temperature, should be installed or included in the automated process control system of the DG.

Portable devices can be used in SHRP.

6.5.7 Instrumentation and measuring instruments with an electrical output signal and electrical equipment placed in the premises of gas distribution centers and gas distribution centers with explosive zones should be provided in explosion-proof design.

Instrumentation with an electrical output signal in a normal design must be placed outside, outside the explosive zone in a lockable cabinet made of non-combustible materials or in a separate room attached to a fire-resistant gas-tight (within the adjoining) wall of the gas distribution center and gas distribution center.

The introduction of pulse gas pipelines into this room for transmitting gas pressure pulses to devices should be carried out in such a way as to exclude the possibility of gas entering the instrumentation room.

6.5.8 Electrical equipment and electrical lighting of gas distribution centers and gas distribution centers must comply with the requirements of the rules for the construction of electrical installations.

In terms of reliability of power supply, gas distribution centers and gas distribution centers of settlements should be classified in the 3rd category, and gas distribution centers and gas distribution centers of industrial enterprises should be classified in the main production. Lightning protection of gas distribution centers and gas distribution centers must meet the requirements for facilities II lightning protection categories.

7 INTERNAL GAS PIPELINES

7.1 The possibility of placing gas-using equipment in the premises of buildings for various purposes and the requirements for these premises are established by the relevant building codes and rules for the design and construction of buildings, taking into account the requirements of standards and other documents for the supply of the specified equipment, as well as data from factory passports and instructions defining the area and conditions of its applications.

It is prohibited to place gas-using equipment (natural gas and LPG) in the basement and ground floors of buildings (except for single-family and semi-detached residential buildings), unless the possibility of such placement is regulated by the relevant building codes and regulations.

7.2 Premises of buildings for all purposes (except for residential apartments) where gas-using equipment is installed, operating in automatic mode without the constant presence of maintenance personnel, should be equipped with gas monitoring systems with automatic shutdown of the gas supply and output of a signal about gas contamination to a control center or to a room with the constant presence of personnel , unless other requirements are regulated by the relevant building codes and regulations.

Indoor gas control systems with automatic shutdown of gas supply in residential buildings should be provided when installing heating equipment:

regardless of installation location - power over 60 kW;

in basements, ground floors and in extensions to the building - regardless of the thermal power.

7.3 Internal gas pipelines should be made of metal pipes. Connection to gas pipelines of household gas appliances, instrumentation, LPG cylinders, gas burners of portable and mobile gas-using equipment may be provided with flexible hoses that are resistant to the transported gas at a given pressure and temperature.

7.4 Pipe connections must be permanent.

Detachable connections are allowed to be provided at the points of connection of gas and gas-using equipment, fittings and instrumentation, as well as on gas pipelines and gas-using equipment, if this is provided for in the manufacturer’s documentation.

7.5 Gas pipelines should be laid open or hidden. When gas pipelines are laid hidden, it is necessary to provide additional measures to protect them from corrosion and ensure the possibility of inspecting them and repairing protective coatings.

At the intersections of building structures, gas pipelines should be laid in cases.

Hidden installation of LPG gas pipelines is not permitted.

7.6 If necessary, open transit laying of gas pipelines is allowed, including through residential premises, public premises and industrial premises of buildings for all purposes, taking into account the requirements of the gas pressure table, if there are no detachable connections on the gas pipeline and access is provided for its inspection.

7.7 Purge pipelines should be provided on gas pipelines of industrial buildings, boiler houses, public and domestic industrial buildings.

7.8 It is not allowed to provide for the laying of gas pipelines: in premises classified as explosion and fire hazard categories A and B; in explosive zones of all premises; in basements; in warehouse buildings of explosive and flammable materials; in the premises of substations and distribution devices; through ventilation chambers, shafts and channels; through elevator shafts and staircases, waste disposal rooms, chimneys; through rooms where the gas pipeline may be subject to corrosion, as well as in places of possible exposure to aggressive substances and in places where gas pipelines may be washed by hot combustion products or come into contact with heated or molten metal.

7.9 The installation of disconnecting devices should include:

in front of gas meters (if a disconnecting device at the input cannot be used to turn off the meter);

in front of household gas appliances, stoves, cooking boilers, heating stoves, gas equipment and instrumentation;

in front of burners and igniters of gas-using equipment;

on purge gas pipelines;

at the entrance of a gas pipeline into a room when a GRU or gas meter with a disconnecting device is placed in it at a distance of more than 10 m from the entry point.

The installation of disconnecting devices in hidden and transit sections of the gas pipeline is prohibited.

7.10 Each facility where gas-using equipment is installed must be equipped with a gas flow meter in accordance with the rules for the use of gas approved in the established manner.

According to the decision of the executive authorities of the constituent entities of the Russian Federation on the procedure for recording gas consumption by consumers and regulating gas prices in gasified residential buildings, as well as during gasification of greenhouses, bathhouses and other household buildings, it must be possible to record the gas consumption of each subscriber by installing a flow meter on the gas pipeline gas meter.

8 RESERVOIR AND CYLINDER UNITS FOR LIQUEFIED HYDROCARBON GASES

8.1 TANK UNITS

8.1.1 The requirements of this subsection apply to LPG tank installations serving as sources of gas supply to residential, administrative, public, industrial and domestic buildings.

Gas distribution networks for transporting gas to consumers from tank installations must comply with the requirements of these building codes and regulations.

8.1.2 The tank installation should include gas pressure regulators, safety shut-off and safety relief valves (PZK and PSK), control and measuring instruments (instrumentation) for monitoring the pressure and level of LPG in the tank, shut-off valves, tanks manufactured at the factory in in accordance with current standards, as well as liquid and vapor phase pipelines.

If technically necessary, the tank installation includes LPG evaporation units manufactured at the factory in accordance with current standards.

8.1.3 The number of tanks in the installation must be at least two. It is allowed to provide for the installation of one tank if, according to the technology and specific gas consumption modes, breaks in gas consumption are allowed.

If there are more than two tanks, the installation should be divided into groups, and the tanks of each group should be connected to each other by pipelines through the liquid and vapor phases, on which it is necessary to install shutdown devices.

For the joint operation of separate groups of tanks, they should be connected to each other by vapor phase pipelines, on which shut-off devices must be provided.

8.1.4 The total capacity of the tank installation and the capacity of one tank should be taken no more than those indicated in the table.

Table 6

	Total capacity of the tank installation, m 3		Maximum capacity of one tank, m 3
	aboveground	underground	aboveground	underground
Gas supply for residential, administrative and public buildings		300
Gas supply to industrial buildings, domestic buildings of industrial enterprises and boiler houses		300		100

8.1.5 Underground tanks should be installed at a depth of at least 0.6 m from the ground surface to the upper reservoir in areas with seasonal ground freezing and 0.2 m in areas without ground freezing.

When installing tanks, measures should be taken to ensure their stability.

8.1.6 The clear distance between underground tanks must be at least 1 m, and between above-ground tanks - equal to the diameter of the larger adjacent tank, but not less than 1 m.

Distances from tank installations with a total capacity of up to 50 m 3, counting from the outermost tank, to buildings, structures for various purposes and communications should be taken no less than those indicated in the table.

Distances from tank installations with a total capacity of over 50 m 3 are taken according to the table.

When reconstructing existing facilities, as well as in cramped conditions (during new design), it is permitted to reduce the distances indicated in the table by up to 50% (with the exception of distances from water supply and other non-canal communications, as well as railways of the general network) with appropriate justification and implementation of measures that ensure safety during operation. The distances from cylinder and evaporation installations indicated in the table are accepted for residential and industrial buildings IV fire resistance ratings, for buildings III the degree of fire resistance can be reduced to 10 m, for buildings I and II degrees of fire resistance - up to 8 m.

Distances to a residential building in which public institutions (enterprises) are located should be taken as for residential buildings.

8.1.7 Tank installations must have a ventilated fence made of non-combustible materials with a height of at least 1.6 m. The distance from the tanks to the fence should be at least 1 m, while the distance from the fence to the outer edge of a closed embankment or enclosing wall made of non-combustible materials (for above-ground installation of tanks ) should be taken at least 0.7 m.

Table 7

	Clear distance from tanks, m						Clear distance from the evaporation or group cylinder installation, m
	aboveground			underground
	with the total capacity of tanks in the installation, m 3
	up to 5	St. 5 to 10	St. 10 to 20	to 10	St. 10 to 20	St. 20 to 50
1. Public buildings and structures		50*	60*
2. Residential buildings		30*	40*
3. Children's and sports grounds, garages (from the fence of the tank installation)
4. Industrial buildings (industrial, agricultural enterprises and consumer service enterprises of a production nature)
5. Sewerage, heating main (underground)	3,5	3,5	3,5	3,5	3,5	3,5	3,5
6. Aboveground structures and communications (overpasses, heating mains, etc.) not related to the tank installation
7. Water supply and other non-channel communications
8. Wells of underground communications
9. Railways of the general network (up to the base of the embankment or the edge of the excavation from the side of the tanks)
10. Access roads of railways of industrial enterprises, tram tracks (up to the axis of the track), highwaysI- IIIcategories (to the edge of the roadway)
11. HighwaysIVAndVcategories (to the edge of the roadway) and enterprises
12. Power lines, TP, RP	In accordance with the rules for electrical installations [ ]
* Distances from the tank installation of enterprises to buildings and structures that are not served by it. *Note* - The distance from gas pipelines is taken in accordance withSNiP 2.07.01 AndSNiP II-89 .

8.1.8 Evaporation installations should be placed in open areas or in separate buildings, premises (attached or built into industrial buildings), the floor level of which is located above the ground level, at a distance of at least 10 m from the fence of the tank installation and at a distance from buildings, structures and communications not less than indicated in the table.

Evaporation units with a capacity of up to 100 m 3 / h (200 kg / h) are allowed to be installed directly on the lids of tank necks or at a distance of at least 1 m from underground or above-ground tanks, as well as directly near gas-consuming units if they are located in separate rooms or in open areas.

When placing evaporators in groups, the distance between them should be at least 1 m.

8.2 CYLINDER GROUP AND INDIVIDUAL INSTALLATIONS

8.2.1 LPG cylinder installations, serving as sources of gas supply to residential, administrative, public, industrial and domestic buildings, are divided into:

group, which includes more than two cylinders;

individual, which includes no more than two cylinders.

8.2.2 The group cylinder installation should include LPG cylinders, shut-off valves, a gas pressure regulator, a PSK indicating a pressure gauge and high and low pressure pipelines. The number of cylinders in a group installation should be determined by calculation.

8.2.3 The maximum total capacity of a group cylinder installation should be taken according to the table.

Table 8

	Capacity of all cylinders in a group cylinder installation, l (m 3), when placed
	at the walls of the building	at a distance from the building
Gas supply to residential, administrative, public and domestic buildings	600 (0,6)	1000 (1)
Gas supply to industrial and agricultural consumer services enterprises	1000 (1)	1500 (1,5)

8.2.4 The placement of group cylinder installations should be provided at a distance from buildings and structures not less than those indicated in the table or at the walls of gasified buildings not less than III degree of fire resistance class CO at a distance from window and door openings not less than those indicated in the table.

It is not allowed to provide more than one group installation near a public or industrial building. Near a residential building, it is allowed to provide no more than three cylinder installations at a distance of at least 15 m from one another.

8.2.5 Individual cylinder installations should be provided both outside and inside buildings. It is allowed to place cylinders in apartments of a residential building (no more than one cylinder per apartment) with no more than two floors. In this case, the cylinders must comply with their purpose (area of application) established by standards and other regulatory documents.

Individual cylinder installations outside should be provided at a clear distance of at least 0.5 m from window openings and 1.0 m from doorways on the first floor, at least 3.0 m from door and window openings on ground and basement floors, as well as sewer wells .

8.2.6 The LPG cylinder should be placed at a distance of at least 0.5 m from the gas stove (except for built-in ones) and 1 m from heating appliances. When constructing a screen between the cylinder and the heating device, the distance may be reduced to 0.5 m. The screen must be made of non-combustible materials and provide protection for the cylinder from the thermal effects of the heating device. When installing an LPG cylinder outdoors, it should be protected from damage by transport and heating above 45 °C.

The installation of LPG cylinders in production premises should be provided in places protected from damage by intra-shop transport and metal splashes, from exposure to corrosive liquids and gases, as well as from heating above 45 °C.

8.2.7 Installation of LPG cylinders is not permitted:

in living rooms and corridors;

in basements, basements and attics;

in rooms located under and above: dining and sales areas of public catering establishments; auditoriums and classrooms; auditoriums (assembly) halls of buildings; hospital wards; other similar premises;

in rooms without natural light;

at emergency exits;

from the main facades of buildings.

9 GAS FILLING STATIONS (POINTS) FOR LIQUEFIED HYDROCARBONS GAS (GNS)

9.1 GENERAL PROVISIONS

9.1.1 A gas filling station (GNS), designed for receiving, storing and distributing liquefied hydrocarbon gases (LPG) to consumers in tank trucks and household cylinders, repairing and re-examining cylinders, should be located outside the residential territory of settlements, as a rule, on the leeward side for winds of the prevailing direction relative to to residential areas.

9.1.2 The selection of a site for the construction of a gas pumping station must take into account the distances to the buildings and structures surrounding the gas pumping station, as well as the presence of railways and roads in the construction area.

9.1.3 The site for the construction of a gas pumping station should be provided taking into account the provision of a 10 m wide firebreak outside the gas filling station fence and minimum distances to forest areas: coniferous trees - 50 m, deciduous trees - 20 m, mixed species - 30 m.

St. 1.2 to 1.6 (for LPG)
Gas pipelines and hydraulic fracturing equipment

St. 0.005 to 0.3
St. 0.3 to 0.6
St. 0.6 to 1.2
Gas pipelines inside buildings, gas pipelines and GRU equipment
Gas pipelines of residential buildings with pressure up to 0.003
Gas pipelines of boiler houses, public, administrative, domestic and industrial buildings with pressure:

St. 0.005 to 0.1
St. 0.1 to 0.3	1.25 from the worker, but not more than 0.3
St. 0.3 to 0.6	1.25 from the worker, but not more than 0.6
St. 0.6 to 1.2	1.25 from the worker, but not more than 1.2
St. 1.2 to 1.6 (for LPG)	1.25 from the worker, but not more than 1.6

10.5.8 Underground gas pipelines laid in cases at sections of transitions through artificial and natural barriers should be tested in three stages:

After welding the transition before laying it in place;
after laying and completely backfilling the transition;
along with the main gas pipeline.
It is allowed not to carry out tests after complete installation and backfilling of the crossing in agreement with the operating organization.
Testing of transition sections is allowed to be carried out in one stage together with the main gas pipeline in the following cases:
absence of welded joints within the transition;
using directional drilling method;
use within the transition for welding polyethylene pipes parts with embedded heaters or welding equipment with a high degree of automation.

10.5.9 The results of the tightness test should be considered positive if during the test period the pressure in the gas pipeline does not change, that is, there is no visible pressure drop on a pressure gauge of accuracy class 0.6, and on pressure gauges of accuracy class 0.15 and 0.4, as well as on a liquid pressure gauge, the pressure drop is recorded within one scale division.

When testing the gas pipeline is completed, the pressure should be reduced to atmospheric pressure, automation, fittings, equipment, and instrumentation should be installed and the gas pipeline should be kept under operating pressure for 10 minutes. The tightness of detachable connections should be checked with soap emulsion.

Defects discovered during testing of gas pipelines should be eliminated only after the pressure in the gas pipeline has been reduced to atmospheric pressure.

After eliminating the defects discovered as a result of the gas pipeline leak test, this test should be repeated.

Gas pipeline joints welded after testing must be checked using a physical control method.

10.5.10 Liquefied hydrocarbon gas tanks, together with liquid and vapor phase piping, should be tested in accordance with the requirements of the rules for the design and safe operation of pressure vessels.

10.6 ACCEPTANCE BY THE CUSTOMER OF COMPLETED
CONSTRUCTION OF GAS DISTRIBUTION SYSTEMS FACILITIES

10.6.1 To accept the completed gas distribution system facility, the customer creates an acceptance committee.

The acceptance committee includes representatives of the customer (chairman of the committee), design and operating organizations. Representatives of the Gosgortechnadzor bodies of Russia are included in the acceptance committee when accepting objects controlled by these bodies.

10.6.2 The general contractor presents the following documentation in one copy to the acceptance committee for the completed gas distribution system facility:

A set of working drawings (executive geodetic documentation in accordance with GOST R 51872) for the construction of the object presented for acceptance with inscriptions made by the persons responsible for the construction and installation work on the compliance of the work performed in kind with these drawings or changes made to them by the design organization;
certificates of manufacturers (their copies, extracts from them, certified by the person responsible for the construction of the facility) for pipes, fittings, welding and insulating materials;
technical passports of manufacturing plants (procurement workshops) or copies thereof for equipment, components, connecting parts, insulating coatings, insulating flanges, fittings with a diameter of over 100 mm, as well as other documents certifying the quality of equipment (products);
manufacturer's instructions for operating gas equipment and appliances;
construction passports: external gas pipeline, gas inlet; intra-house (in-shop) gas equipment; hydraulic fracturing; LPG tank installation;
protocol for testing welded joints of a gas pipeline using the radiographic method, protocols for mechanical testing of welded joints of steel and polyethylene gas pipelines; protocol for checking welded joints of a gas pipeline using the ultrasonic method and a protocol for checking the quality of joints made by contact welding and soldering;
act of laying out and transferring the route (site) for the underground gas pipeline and LPG tanks;
work logbook (for underground gas pipelines with a length of over 200 m and LPG tanks) - at the customer’s request;
acceptance certificate for electrochemical protection installations provided for by the project (for underground gas pipelines and LPG tanks);
acts of acceptance of hidden and special work performed in accordance with the work agreement (contract) - for hydraulic fracturing, boiler houses;
act of acceptance of gas equipment for comprehensive testing (for enterprises and boiler houses);
act of acceptance of the cleaned internal cavity of the gas pipeline to be restored;
act of acceptance of the internal cavity of a gas pipeline restored with a fabric hose or other materials, the suitability of which (in the absence of regulatory documents on them) has been confirmed in the prescribed manner;
warranty obligation for the restored gas pipeline (for the period specified in the contract);
technical certificate for imported materials and technologies used in construction.

10.6.3 The acceptance committee must check the compliance of the installed gas distribution system with the project and the submitted as-built documentation, and the requirements of these building codes and regulations.

10.6.4 Acceptance by the customer of a completed construction of a gas distribution system facility must be formalized by an act in the form of mandatory Appendix B. This act confirms the fact of the creation of the facility and its compliance with the project and the mandatory requirements of regulatory documents. It is final for a separately constructed gas distribution system facility. For a gas distribution system that is part of a building or structure, it is included in the acceptance documentation for this building (structure).

10.6.5 Acceptance by the customer of a completed gas filling station (point) is carried out in accordance with the general procedure in accordance with the requirements of current regulatory documents for construction.

Acceptance by the customer of a completed construction of a gas distribution system facility can be carried out in accordance with the requirements of territorial construction standards (TSN) for acceptance, approved in the prescribed manner.

APPENDIX A

(informational)

LIST OF REGULATIVE DOCUMENTS FOR WHICH
THERE ARE REFERENCES IN SNiP 42-01-2002

SNiP 10-01-94	System of regulatory documents in construction. Basic provisions
SNiP 2.01.07-85*	Loads and impacts
SNiP 2.01.09-91	Buildings and structures in mined areas and subsidence soils
SNiP 2.01.14-83	Determination of design hydrological characteristics
SNiP 2.01.15-90	Engineering protection of territories, buildings and structures from hazardous geological processes. Design Basics
SNiP 2.03.11-85	Protection of building structures from corrosion
SNiP 2.04.01-85*	Internal water supply and sewerage of buildings
SNiP 2.04.02-84*	Water supply. External networks and structures
SNiP 2.04.03-85*	Sewerage. External networks and structures
SNiP 2.04.05-91*	Heating, ventilation and air conditioning
SNiP 2.04.07-86*	Heating network
SNiP 2.07.01-89*	Urban planning. Planning and development of urban and rural settlements
SNiP 2.08.02-89*	Public buildings and structures
SNiP 3.01.01-85*	Organization of construction production
SNiP 21-01-97*	Fire safety of buildings and structures
SNiP 31-03-2001	Industrial buildings
SNiP 32-01-95	1520 mm gauge railways
SNiP II-7-81*	Construction in seismic areas
SNiP II-89-80*	Master plans of industrial enterprises
GOST 9.602-89	ESZKS. Underground structures. General requirements for corrosion protection
GOST 5542-87	Natural flammable gases for industrial and municipal purposes. Specifications
GOST 6996-66	Welded joints. Methods for determining mechanical properties
GOST 7512-82*	Non-destructive testing. Welded connections. Radiographic method
GOST 9544-93	Pipeline shut-off valves. Valve tightness standards
GOST 14782-86	Non-destructive testing. Welded connections. Ultrasonic methods
GOST 16037-80	Welded connections of steel pipelines. Main types, structural elements and dimensions
GOST 20448-90	Hydrocarbon liquefied fuel gases for municipal and domestic consumption. Specifications
GOST 23055-78	Classification of welded joints based on radiographic testing results
GOST 26433.2-94	System for ensuring the accuracy of geometric parameters in construction. Rules for performing measurements of parameters of buildings and structures
GOST 27578-87	Liquefied hydrocarbon gases for road transport. Specifications
GOST 27751-88	Reliability of building structures and foundations. Basic principles for calculation
GOST R 50838-95*	Polyethylene pipes for gas pipelines. Specifications
GOST R 51872-2002	Executive geodetic documentation. Execution Rules

APPENDIX B

(mandatory)

ACCEPTANCE ACT OF COMPLETED CONSTRUCTION
GAS DISTRIBUTION SYSTEM

(name and address of the object)

_______________ "_____" ____________ 200___
Acceptance committee consisting of: chairman of the committee - representative of the customer
________________________________________________________________________________

commission members - representatives:
design organization _________________________________________________________________
(last name, first name, patronymic, position)
operating organization
________________________________________________________________________________
(last name, first name, patronymic, position)
body of the Gosgortekhnadzor of Russia
________________________________________________________________________________

(last name, first name, patronymic, position)

INSTALLED:
1. General contractor ______________________________________________________________
(name of company)
completed construction presented for acceptance ___________________________________
(Object name)
At the completed construction site _____________________________________________________
(Object name)
subcontractors _____________________________________________________
________________________________________________________________________________

(names of organizations)

The following work was completed: _____________________________________________________
2. Project No. ______ developed by _____________________________________________________
(name of company)
3. The construction of the gas supply system for the facility was carried out within the following time frames:
start of work ________________________, completion of work ________________________
(month, year) (month, year)
4. Documentation for the completed construction facility has been presented to the extent required
SNiP 42-01-2002 or TSN for acceptance.
The acceptance committee reviewed the submitted documentation and performed an external inspection
gas supply systems, determined the compliance of the construction and installation work performed
project, carried out, if necessary, additional tests (except those recorded in
executive documentation) ______________________________________________
(types of tests)

Decision of the acceptance committee:
1. Construction and installation work was completed in full in accordance with the project and
requirements of SNiP 42-01-2002.
2. The object presented for acceptance is considered accepted by the customer together with the attached
executive documentation with “__”__________ 200_

OBJECT ACCEPTED
Chairman of the commission ________________________________________________

(signature)

Print location

Representative
design organization ________________________________________

(signature)

Representative
operating organization _________________________________

(signature)

Authority representative
Gosgortekhnadzor of Russia _____________________________________________

(signature)

THE PROPERTY IS COMPLETED
Representative
general contractor _____________________________________________

(last name, first name, patronymic, position, signature)

APPENDIX B

BIBLIOGRAPHY

NPB 105-95 Determination of categories of premises and buildings according to explosion and fire hazard
PUE Rules for electrical installations
NPB 111-98* Gas stations. Fire safety requirements
NPB 110-99* List of buildings, structures, premises and equipment subject to protection by automatic fire extinguishing installations and automatic fire alarms
RD-34.21.122-87 Instructions for the installation of lightning protection of buildings and structures
PB 10-115-96 Rules for the design and safe operation of pressure vessels

Key words: gas distribution systems, natural gas, liquefied petroleum gas, fuel, internal gas pipelines, operational characteristics, safety requirements

Excerpts from SNiP 42-01-2002 "Gas distribution systems"
(adopted and put into effect by Decree of the State Construction Committee of the Russian Federation dated December 23, 2002 N 163)
Date of introduction: July 1, 2003. Replaces SNiP 2.04.08-87* and SNiP 3.05.02-88*

Introduction

These building codes and regulations contain technical requirements mandatory for the design and construction of new and reconstructed gas distribution systems designed to provide natural and liquefied hydrocarbon gases to consumers using gas as fuel, as well as internal gas pipelines, and establish requirements for their safety and performance characteristics .
In accordance with SNiP 10-01, the main features of these rules and regulations are:
priority of requirements aimed at ensuring reliable and safe operation of gas distribution systems;
protection of the legally protected rights and interests of consumers of construction products by regulating the operational characteristics of gas distribution systems; expanding the possibilities of using modern efficient technologies, new materials and equipment for the construction of new and restoration of worn-out gas distribution systems;
harmonization with foreign regulatory documents.
Specific recommendations, the implementation of which ensures compliance with the requirements of these building codes and regulations, are given in the codes of practice:
SP 42-101 "General provisions for the design and construction of gas distribution systems made of metal and polyethylene pipes";
SP 42-102 "Design and construction of gas pipelines from metal pipes";
SP 42-103 "Design and construction of gas pipelines from polyethylene pipes and reconstruction of worn-out gas pipelines."
SNiP 42-01-2002 was approved by the State Mining and Technical Supervision Service of Russia, the Main Directorate for State Fire and Safety Regulations of the Ministry of Emergency Situations of Russia and other interested organizations and was submitted for approval to the State Construction Committee of Russia by the joint-stock company "Polymergaz".
The following people took part in the development of these building codes and regulations:
Volnov Yu.N., Gabelaya R.D., Gashilov V.M., Golik V.G., Guseva N.B., Zaitsev K.I., Kaigorodov G.K., Linev V.P., Mayevsky M. A.A., Nedlin M.S., Palchikov S.A., Platonov O.V., Rozhdestvensky V.V., Safronova I.P., Sessin I.V., Sorokin A.A., Udovenko V.E. ., Tsarkov V.N., Chirchinskaya G.L., Shishov N.A., Shurayts A.L.

1 area of use

These rules and regulations apply to new and reconstructed gas distribution systems designed to provide natural and liquefied hydrocarbon gases to consumers using gas as fuel, as well as internal gas pipelines, and establish requirements for their safety and performance characteristics.

3. Terms and definitions
In this regulatory document, the following terms and their definitions are used.
The gas distribution system is a property production complex consisting of technologically, organizationally and economically interconnected facilities intended for transporting and supplying gas directly to its consumers.
Gas distribution network - a system of external gas pipelines from the source to the supply of gas to consumers, as well as structures and technical devices on them.
Gas distribution source - an element of the gas supply system (for example, a gas distribution station - GDS) that serves to supply gas to the gas distribution network.
External gas pipeline - an underground, ground and (or) above-ground gas pipeline laid outside buildings to the outer structure of the building.
Internal gas pipeline - a gas pipeline laid from the external structure of a building to the connection point for gas-using equipment located inside the buildings.
Gas-using equipment is equipment that uses gas as fuel.
Gas equipment- technical products of full factory readiness (compensators, condensate collectors, pipeline shut-off valves, etc.), used as components of gas pipelines.
A gas pipeline security zone is a territory with special conditions of use, established along gas pipeline routes and around other gas distribution network facilities in order to ensure normal operating conditions and eliminate the possibility of damage.

7. Internal gas pipelines

7.1 The possibility of placing gas-using equipment in the premises of buildings for various purposes and the requirements for these premises are established by the relevant building codes and rules for the design and construction of buildings, taking into account the requirements of standards and other documents for the supply of the specified equipment, as well as data from factory passports and instructions defining the area and conditions its application. It is prohibited to place gas-using equipment (natural gas and LPG) in the basement and ground floors of buildings (except for single-family and semi-detached residential buildings), unless the possibility of such placement is regulated by the relevant building codes and regulations.

7.2 Premises of buildings for all purposes (except for residential apartments), where gas-using equipment is installed, operating in automatic mode without the constant presence of maintenance personnel, should be equipped with gas monitoring systems with automatic shutdown of the gas supply and output of a signal about gas contamination to the control center or to a room with constant presence personnel, unless other requirements are regulated by the relevant building codes and regulations. Systems for monitoring indoor gas pollution with automatic shutdown of gas supply in residential buildings should be provided when installing heating equipment: regardless of the installation location - with a power of over 60 kW; in basements, ground floors and in extensions to the building - regardless of the thermal power.

7.3 Internal gas pipelines should be made of metal pipes. Connection to gas pipelines of household gas appliances, instrumentation, LPG cylinders, gas burners of portable and mobile gas-using equipment may be provided with flexible hoses that are resistant to the transported gas at a given pressure and temperature.

7.4 Pipe connections must be permanent. Detachable connections are allowed to be provided at the points of connection of gas and gas-using equipment, fittings and instrumentation, as well as on gas pipelines and gas-using equipment, if this is provided for in the manufacturer’s documentation.

7.5 The laying of gas pipelines should be open or hidden. When gas pipelines are laid hidden, it is necessary to provide additional measures to protect them from corrosion and ensure the possibility of inspecting them and repairing protective coatings. At the intersections of building structures, gas pipelines should be laid in cases. Hidden installation of LPG gas pipelines is not permitted.

7.6 If necessary, open transit laying of gas pipelines is allowed, including through residential premises, public premises and industrial premises of buildings for all purposes, taking into account the requirements of Table 2 for gas pressure, if there are no detachable connections on the gas pipeline and access is provided for its inspection.

7.7 Purge pipelines should be provided on gas pipelines of industrial buildings, boiler houses, public and domestic industrial buildings.

7.8 It is not allowed to provide for the laying of gas pipelines: in premises classified as explosion and fire hazard categories A and B; in explosive zones of all premises; in basements; in warehouse buildings of explosive and flammable materials; in the premises of substations and distribution devices; through ventilation chambers, shafts and channels; through elevator shafts and staircases, waste disposal rooms, chimneys; through rooms where the gas pipeline may be subject to corrosion, as well as in places of possible exposure to aggressive substances and in places where gas pipelines may be washed by hot combustion products or come into contact with heated or molten metal.

7.9 The installation of disconnecting devices should be provided: in front of gas meters (if a disconnecting device at the input cannot be used to disconnect the meter); in front of household gas appliances, stoves, cooking boilers, heating stoves, gas equipment and instrumentation; in front of burners and igniters of gas-using equipment; on purge gas pipelines; at the entrance of a gas pipeline into a room when a GRU or gas meter with a disconnecting device is placed in it at a distance of more than 10 m from the entry point. The installation of disconnecting devices in hidden and transit sections of the gas pipeline is prohibited.

7.10 Each facility where gas-using equipment is installed must be equipped with a gas consumption meter in accordance with the rules for the use of gas approved in the established manner. According to the decision of the executive authorities of the constituent entities of the Russian Federation on the procedure for recording gas consumption by consumers and regulating gas prices in gasified residential buildings, as well as during gasification of greenhouses, bathhouses and other household buildings, it must be possible to record the gas consumption of each subscriber by installing a flow meter on the gas pipeline gas meter.

Source of information: Information portal