4 General Technical Specification of Bhilai Steel Plant, SAIL ...

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General Technical Specification
temporary loads and minimum earth covering of 1000mm in areas not subject to
temporary loads, unless otherwise specified.
22. For the pipelines laid on roof, the distance from the external edge of the pipe to
the roof shall be at least 0.5m.
23. All shop headers, except for gravity fluids, shall be generally routed along
columns in multiple rows at a height 4 to 6m above floor level. The connections
to equipment shall be taken through suitable covered floor trenches for shops at
ground floor and for basements, for elevated operating floors, the equipment
pipe work connection may be taken below the floor level. All isolated single pipe
connections to equipment shall be buried in the flooring / equipment foundations.
Pipe work from basement and oil cellars to main equipment shall be routed in
pipe tunnels / trenches with adequate spacing for easy maintenance. All pipe
trenches shall be covered by chequered plate or by concrete slabs.
24. The bleeder pipes for purging lines and other exhaust pipe work shall be routed
upward along columns / gable ends and / or walls to a minimum height of
4,000mm above the roof level / platforms.
25. For the gas pipelines laid along the building walls, the clearance between the
gas pipelines and the wall shall be adopted so as to ensure the possibility for
maintenance of the gas pipelines. The gas pipelines laid on the walls must not
cross the window and door openings.
26. Branch pipes from the headers to the building through walls and the roof shall be
encased.
27. Gas pipelines shall be earthed. When laid under the high voltage lines, a
protective sheet guarding shall be provided above the gas pipelines. The
guarding shall be earthed. The earthing resistance must be not over 10 ohm.
28. Platforms, access ladders, hand railing, etc. shall be provided for operation and
maintenance of valves, instruments and controls. Manholes and hatches shall be
provided for access inside the gas pipelines.
29. At all the places of regular maintenance (gate valves, throttle valves, orifice
plates, hatches, manholes, bleeders, etc.) if located at a height of over 2.5m
from the maintenance level, provision shall be made for stationary platforms with
the railings and stairs / ladders.
30. To ensure the condensate drainage, the gas pipelines shall be laid with a
gradient of about 0.005 towards the water drains.
Condensate drains shall be equipped with bleeders.
Necessary water pipe work for condensate seal pot shall be provided.
31. Flash back arrestors shall be provided in each section of the pipe work for
acetylene and LP gas to prevent flame propagation or pressure surges. They
may be of hydraulic / cartridge type flash back arrestors or back pressure valves.
32. All branch pipes from main header shall be connected through a hydraulic
arrestor.
Gases & Liquid Fluids
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GS-02