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

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General Technical Specification
a) Additional pipes on existing gas pipes will be allowed to be laid only
with the permission of concerned plant personnel.
b) In each case, the gas pipes and supporting structures shall be checked
with due consideration for additional loads and practical state of the
metal structure of gas pipes.
c) When installing with pipes carrying corrosive fluids they shall be kept at
least 500 mm below or by the side of the gas pipe at a distance of
500mm.
If flange joints are provided on pipes carrying corrosive liquids, it is
necessary to mount protective baffle plate against falling of corrosive
liquids on gas pipes and their supports.
d) The associated gas pipes at the places on gas pipes where valves and
other devices are mounted, should be kept at a minimum 800 mm
distance from the main pipe.
e) Drainage of the associate pipes should be laid to one side at a distance
so that condensate does not fall on gas pipes/ its accessories,
supporting structures and their elements, etc.
06. The branch line should generally be installed outside building along roof wall.
Branch line having diameter less than 500 mm may be laid inside shop building.
07. Branch line from gas main entering into building through building wall should
pass through casings. Internal clearance between casing and pipe should be
suitably filled up, wherever required.
08. Gas branch line from gas main passing through roof covering should have
circular opening. For this purpose, a circular opening should be made on roof
and a taper hood should be provided on the branch line above the roof for
protection from rain.
09. Shop headers (except headers of By-product Plant) should be mounted at a
height having minimum ground clearance of 4500 mm, when laying them outside
the building wall.
10. Layout of gas consuming units in various shops should be such that it is
possible to bring the gas pipes above ground.
11. Gas pipes of coke oven, natural gas and also their mixtures with blast furnace
gas may be installed in channels and casings, in the region of gas supply to
furnace and other consuming units.
The following conditions should be observed for this purpose :
a) Clearance between wall and bottom should be at least 400 mm, and for gas
pipes of 200 mm and below clearances should not be less than the gas pipe
diameter.
b) Installation of flanges, threaded joints and accessories (except accessories for
removal of condensate on a pipeline) is not allowed when it is laid in a channel.
The number of welds on such gas pipes should be restricted to a minimum.
Gases & Liquid Fluids
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GS-02