Surgil ESIA Report - Volume III - EKN

“O’ZLITINEFTGAZ” PC
PFS “Surgil field complex costruction with valuable
components retrieval”
- gate valves installed after 10km.
There are accepted by the project pipes with factory three-layer isolation of the
strengthened type for protection of the gas pipeline from soil corrosion.
At non-delivery of pipes with factory isolation and for isolation of gas pipelines -
loops, gas collectors it is possible to apply a polymeric tape made in USA “Polycen 980-25”
with wrapper “Polycen 955-25” by primer “Polycen 919 S”.
40°С.
It is possible to apply other tapes which provide gas transport with temperature 55-
Isolation and wrapper by thickness of 0.63mm applied in 1 layer provide the
strengthened type.
There is provided protection of isolation from damages by soft ground during
pipeline route passage in grounds of V group.
Electrochemical protection should be constructed simultaneously with pipelines
construction.
The cavity of pipelines before test should be cleared of cinder, dirt and casually got
in a pipe during construction of ground, water and other subjects. After carrying out of
pipelines clearing there is conducted its test by hydraulic method.
Durability check is made for pressure 1.1Рwork but no more the test pressure
guaranteed by factory.
Air-tightness test is made for pressure equal to working pressure in pipelines.
Besides, the sites of I category should be tested in 2 stages:
I stage – value of test pressure is accepted according to ВСН 011-88
II stage - simultaneously with all pipeline.
The basic anthropogenic impact during construction will be experienced by soils and
grounds in zone of temporary allotment of lands, upon completion of construction the soils
along pipeline route completely reclamates and become suitable for further use.
Atmospheric air will experienced some impact from working special equipment and
motor transport, however, this impact is short-term and small. There are not present surface
water sources in the considered region and there are not found out underground waters up to
3m depth.
There are designed assembly of reception and launching of treatment facilities for
clearing of internal cavity of the gas pipeline during operation.
Volume 2. Part 1. EIS Project for Surgil field construction
54