Tender Document for Construction of Ghorasal 300-450 MW ... - BPDB

4.3.2.7 Lubricating Oil System
The lubrication system of the unit shall be equipped with the main oil pump,
auxiliary motor driven oil pumps, delivery pipes, return pipes, reservoir,
strainer, oil cooler, pressure gauges and thermometers, and all necessary
oil piping for the system.
The unit shall be equipped with a gear driven main oil pump, a full capacity
motor driven auxiliary oil pump and an emergency DC motor driven oil
pump. The emergency DC motor driven oil pump shall have sufficient
capacity to prevent damage the turbine generator during an emergency
shutdown. Each oil pump shall be equipped with a section strainer.
Pressure switches shall be provided as required to permit automatic
sequential starting of the auxiliary oil pump, and emergency DC oil pump in
case of oil pressure drop. Auxiliary contacts required for indication shall
also be furnished on pumps and pressure switches.
Each oil reservoir shall be furnished complete with, vapour extractor, level
indicator, high and low level alarm switches, strainer, drain valves, overflow
pipe, manhole, valves, and piping.
The system shall include oil pressure and temperature alarm, and trip
mechanism, each bearing shall be provided with thermocouple cell and a
thermometer in pocket of oil drain.
Complete oil coolers each for 100% capacity shall be provided. One of two
oil coolers shall normally be in service, change over from one oil cooler to
the other during operation shall be possible. It shall also be possible to use
both oil coolers at same time. The oil coolers shall be of either air cooling
type or water cooling type. The oil coolers shall be provided with blowers or
water pumps, depending upon the type of cooling.
4.3.2.8 Natural Gas Fuel System
The unit shall be provided with gas fuel system. The natural gas system
shall have the necessary pressure regulating valves, piping, shut off valves,
metering device, pressure gauges, and other indicating instruments
including flow meter with integration. The gas fuel system shall be provided
with necessary protective equipment for proper control and safe operation
of the gas turbine generating unit.
Specification of Natural Gas has been furnished in Annexure -1. The
system shall comprise at least, the following major items including gas
booster compressor:
- Shut off valve.
- An inlet strainer.
- A flow-meter with bypass system.
- Pressure regulating equipment.
- Pressure gauges on before and after regulating equipment.
- A gas conditioner (scrubber and demister).
- A knock out drum if required.
- Drain tank.
- Flare system.
- Inert gas purging system
Ghorasal 300-450 MW CCPP Project (Vol-2A of 2) 48