SNiP 2.04.08-87*

СНиП на английском языке SNiP 2.04.08-87*

4.13.* Minimal horizontal distances from underground and ground-level
(mound) gas pipelines to buildings (except GCS) and installations shall be
designed in accordance to the requirements of SNiP 2.07.01-89. The said distances from GCS buildings to input and output gas pipelines are not subject to regulation. The distances stipulated by SNiP 2.07.01-89 can be reduced by up to 50% in case gas pipeline pressure is below 0.6 MPa (6 kgf/cm2), when pipelines are laid between buildings or under arches, in congested conditions as well as distances from pipelines with pressure above 0.6 MPa (6 kgf/cm2) to detached non-residential or auxiliary buildings.
In such cases, in the reduced distance zones and 5 m in each direction
from those zones the following stipulations shall be made:
Application of seamless or electrically welded pipes subjected to 100%
NDT inspection of welded joint or laying in encasement electrically welded
pipes that were not subjected to such inspection; control of all welded joints by non-destructive testing.
The distance between gas pipeline to external walls of wells or chambers
of other underground utility lines shall be at least 0.3 m. Wherever clear
distance between gas pipeline and external walls of wells or chambers of
other underground utility lines is from 0.3 m to regulatory distance applied to the given line, gas pipelines shall be laid in conformity with the requirements valid for laying pipelines in congested conditions.
In case electrically welded pipes are laid in encasement, the latter shall
protrude at least 2 m to each side from the wall of well or chamber.
The distance from gas pipeline to overhead line towers, street car, trolleybus or electrified railroad contact system shall be designed equal to the distance to poles of power transmission lines of appropriate voltage.
Minimal distances from gas pipelines to longitudinally drained canalless
heat network shall be similar to those applied to canal heat pipelining.
Minimal clear distances from gas pipeline to the nearest heat network pipe laid without canal or drainage shall be equal to those applied to water pipelines.
Distances from anchor poles overshooting the dimensions of heat network
pipes shall be designed to ensure preservation of the latter.
Minimal horizontal distance from gas pipeline to pressure sewage line can
be designed same as applied to water lines.
Distance from gas pipeline to narrow-gage railroad track shall be
designed same as applied to streetcar tracks in accordance with SNiP
2.07.01-89. Distances from gas pipelines to storage of or facilities manufacturing flammable materials shall be designed in accordance with the standards imposed by such facilities but not less than those specified in SNiP 2.07.01- 89. Minimal horizontal and vertical distances from gas pipeline to trunk gas and oil pipelines shall be designed in accordance with the requirements of SNiP 2.05.06-85.
Distances from inter-settlement gas pipelines of 0.6 MPa and higher
pressure to embankment bed or slope edge or, at formation level of public
railroads, outer rail shall not be less than 50 m. Under congested conditions
and subject to agreement of appropriate railroad authorities of the Ministry of Railroads of Russia the said distance can be reduced to the values specified in SNiP 2.07.01-89, provided gas pipeline at such division is laid at the depth of at least 2.0 m, pipe wall thickness is increased by 2 to 3 mm over the rated value and all welded joints are subjected to NDT inspection.

4.14. Two or more gas pipelines can be laid in one trench at one or several levels (step method). Clear distance between gas pipelines shall be sufficient to ensure pipeline installation and maintenance operations.

4.15. Vertical clear distance at intersections of gas pipelines of every pressure with underground utility networks shall be at least 0.2 m; with
regard to power network is shall be in accordance with Operational Code for Electrical Installations (PUE); with regard to cable communication lines and radio transmission networks it shall be in accordance with VSN 116-87 and VSN 600-81 approved by the USSR Ministry of Communications.

4.16. At crossings of underground gas pipelines running above or below heat network canals, communication line channels or canals of various designation gas pipeline shall be laid in encasement protruding 2m on both sides of external walls of the crossed installations and NDT inspection of all welded joints within the crossing zone and at the distance of 5 m from external walls of the crossed installations.
One edge of encasement shall have a control pipe extending under the
protection device.

4.17. Depth of gas pipeline laying shall be at least 0.8 m from the top of
pipeline or encasement.
At locations where no traffic of transport vehicles is supposed to take
place the depth of laying gas pipelines can be reduced to 0.6 m. 4.18. Pipelines transporting wet gas shall be laid below the zone of seasonal frost penetration of ground at not less than 2% inclination towards condensate accumulators.