4 General Technical Specification of Bhilai Steel Plant, SAIL ...
4 General Technical Specification of Bhilai Steel Plant, SAIL ...
4 General Technical Specification of Bhilai Steel Plant, SAIL ...
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© 2007 MECON Limited<br />
All rights reserved<br />
<strong>General</strong> <strong>Technical</strong> <strong>Specification</strong><br />
001 Before charging the pipelines with fuel gas, the entire air from the pipeline shall be<br />
purged with nitrogen / Steam.<br />
002 Before purging, all valves shall be set at required position, drain pots filled with water, all<br />
hatches & manholes closed. All bleeders except the ones used for venting the purge<br />
gas, shall be closed.<br />
003 Discharge from the pipeline shall be through bleeder / vents only. The air / gas should<br />
not be discharged into the shop / furnace.<br />
004 Completion <strong>of</strong> purging shall be determined by taking samples from the bleeders. When<br />
the oxygen content <strong>of</strong> two successive samples is less than 1%, the purging shall be<br />
deemed to be completed.<br />
005 After purging is complete, the gas shall be gradually charged into the pipelines. The<br />
charging shall be done section wise gradually approaching the consumer end.<br />
- The gas shall be discharged through bleeders only. Exhaust gas from bleeders<br />
can be set on fire.<br />
- Completion <strong>of</strong> filling shall be determined by taking samples from the bleeders. In<br />
case oxygen content <strong>of</strong> two successive samples is less than 1 % the gas<br />
blowing shall be deemed to be complete.<br />
006 All activities <strong>of</strong> gas pipe purging and charging shall be co-ordinated in presence <strong>of</strong><br />
OWNER/ MECON, safety personnel, fire tenders, etc.<br />
007 After charging the gas into the system, all isolating devices, instruments, controls, safety<br />
devices, condensate seal pots, etc. shall be again checked for proper operation.<br />
Charging <strong>of</strong> cold blast, nitrogen, Compressed Air<br />
008 After pressure test, the nitrogen and instrument quality compressed air line / cold blast<br />
line shall be purged with nitrogen and dry air respectively for removal <strong>of</strong> moisture, dirt ,<br />
etc. from the piping system.<br />
009 Nitrogen, Instrument quality compressed air, cold blast shall be subsequently charged in<br />
the line by connecting with the existing network.<br />
Charging <strong>of</strong> Steam.<br />
010 After pressure test steam pipeline shall be depressurised and drained <strong>of</strong> water fully<br />
through drains/ by pass <strong>of</strong> steam traps. Subsequently, the pipeline shall be charged with<br />
steam slowly by crack opening the steam supply valve keeping all drain points open.<br />
011 When steam is observed from all drain points and consumer ends then steam valve at<br />
the inlet to the system should be fully opened and all by pass valve on drains closed and<br />
isolation valve on steam traps are kept open.<br />
B) Oxygen pipelines<br />
01 <strong>General</strong><br />
- All work concerning oxygen pipeline system shall be done by persons <strong>of</strong><br />
contractor well conversant with the oxygen service and having proven ability in<br />
the field.<br />
- All safety aspects with regards to selection <strong>of</strong> materials, erection procedure,<br />
degreasing, testing and commissioning procedures, cleanliness, etc. shall be<br />
kept in view by all personnel connected with the job.<br />
- Erection <strong>of</strong> pipes, fittings, instruments, etc. shall be done strictly as per the<br />
approved drawings. Any change proposed to be done at site shall have the<br />
approval <strong>of</strong> the Purchaser’s/ Consultant’s representatives.<br />
Gases & Liquid Fluids<br />
Page 47 <strong>of</strong> 51<br />
GS-02
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