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

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General Technical Specification
v) Separate seal pots shall be provided for different gasses.
vi) Removal of condensate from branch line from inter shop gas pipe and inshop
gas pipe should be carried out in separate condensate seal pots.
vii) Minimum height of the water seal in the condensate seal pot shall exceed the
maximum working pressure of gas by 500 mm, but this height in no case shall
be lower than 2000 mm.
If necessary, the height of water seal can be increased by adding more than one
seal pot in series. However, number of such seal pots shall not exceed three.
Further base plate of seal pot shall have minimum thickness of 16 mm.
While installing common seal pot for a number of gas pipe, height of water seal
should exceed by 500 mm the maximum working pressure in any of the
connected gas pipe.
viii) Design of condensate seal pots should ensure protection against leakage of
harmful gases into building by providing vent of adequate height on the seal pot.
ix) Condensate seal pot shall be provided with purging facilities.
x) Installation of condensate seal pot for in shop gas network is allowed inside the
buildings.
Condensate Drain Arrangement for Medium pressure High pressures gas
i) Condensate disposal for gases having higher line pressure have to be done by
using adequate pressure seal pots.
ii) In a high pressure seal pot the metallic float is utilized for disposal of condensate
and prevent leakage of gas from the pot.
iii) The seal pot should be air tight and wall thickness should be decided on the line
test pressure.
iv) Condensate coming out of seal pot should be discharged into phenolic sewerage
line or in a reservoir provided locally.
02.08. STEAM TRAPS / MOISTURE TRAPS-
At low points in steam & compressed air pipeline steam traps / moisture traps with
strainer assembly will be provided to drain out the condensate. Selection of steam trap
shall be as per IPSS: 1-06-039 – 02. Installation of steam traps shall be as per IPSS: 1-
06-037
02.09. PURGING SYSTEM
System for feeding purge gas and venting of gas/ air from the piping system shall be
provided for all fuel gas piping.
Purging
i) Gas pipelines of blast furnace gas, coke oven gas, converter gas and mixed gas
shall be equipped with nitrogen or steam pipe connection with isolation valve.
The connection of nitrogen or steam pipeline to the gas pipeline shall be done by
means of flexible hose which shall be connected only during the period of
purging.
Gases & Liquid Fluids
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GS-02