Tender Document for Construction of Ghorasal 300-450 MW ... - BPDB
Tender Document for Construction of Ghorasal 300-450 MW ... - BPDB
Tender Document for Construction of Ghorasal 300-450 MW ... - BPDB
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caustic/phosphate into the steam drums. Each package shall consist <strong>of</strong> a<br />
solution tank with accessories. One (1) adjustable simplex pump (with identical<br />
standby pump) will be provided <strong>for</strong> each injection unit.<br />
3.3.8 Instrument Air System<br />
One instrument air system shall be provided consisting <strong>of</strong> two (2) fullcapacity<br />
reciprocating air compressors each with necessary air filters, after<br />
cooler and receiver. One dual tower, desiccant type air dryer shall be furnished<br />
with the system. Each compressor shall be furnished with automatic<br />
controls locally mounted.<br />
3.3.9 Steam Turbine Drains<br />
Various high pressures drains including those from the stop valve and the<br />
steam supply to the steam seal regulator shall be taken to the flash chamber<br />
<strong>of</strong> the condensate receiver. The turbine drain lines required <strong>for</strong> a fast<br />
start-up <strong>of</strong> the steam cycle shall be fitted with motor-operated shut-<strong>of</strong>f<br />
valves.<br />
Various drains from auxiliary steam systems, which shall not be highly essential<br />
to a fast start-up, but shall be considered to be required <strong>for</strong> steam<br />
piping drains, shall be fitted with steam traps and shall be taken to the condensate<br />
receiver. The following steam turbine drains shall be taken to the<br />
condenser.<br />
- Steam chest drain<br />
- First stage shell drain<br />
- Inner valve steam drain<br />
- High pressure packing leak-<strong>of</strong>f<br />
- Exhaust casing drains.<br />
3.3.10 Condenser Air removal System [Air Extraction System]<br />
The air-removal <strong>for</strong> the steam surface condenser shall consist <strong>of</strong> two (2) full<br />
capacity vacuum pumps and one full capacity steam jet air ejector and the<br />
appropriate air removal piping system. Provision shall be kept <strong>for</strong> start-up<br />
stage both vacuum pumps or steam jet air ejectors. When vacuum is established,<br />
the vacuum pumps or steam jet air ejectors are operated in a primary<br />
back-up relationship from the control panel. The back-up vacuum<br />
pump or steam jet air ejector will start up if the pressure switch at the condenser<br />
indicates that the vacuum has decayed to an alarm lever.<br />
3.3.11 Boiler Drains and Sample Coolers<br />
The drains <strong>of</strong> each heat recovery steam generator shall be taken to the<br />
blow-down tank where the high energy is dissipated by flashing the liquid<br />
by steam. The flashed steam shall be vented to atmosphere and the water<br />
shall be discharged to the blow-down tank drain.<br />
The drain lines from the heat recovery steam generator steam lead and the<br />
superheater inlet drain and superheater inlet and outlet shall be located at<br />
this station along with coolers <strong>for</strong> the feedwater samples from the boiler<br />
feed pump discharge.<br />
3.3.12 Fire Protection System<br />
A CO 2 fire protection system shall be provided <strong>for</strong> the gas turbine generat-<br />
<strong>Ghorasal</strong> <strong>300</strong>-<strong>450</strong> <strong>MW</strong> CCPP Project (Vol-2A <strong>of</strong> 2) 34
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