Tender Document Volume - 2 - BPDB

e) Providing various drain lines with isolation valves at drain points from the
compressor and turbine to drain the wash water during washing cycle.
f) Providing bearing seal air piping to protect bearing during washing cycle.
g) Drainage system to drain out the water.
2. Compressor wash water quality
Total trace elements in compressor wash water (after adding detergent)
will preferably be limited as follows.
No. Trace Metal For Million Parts of
Water by weight
Sodium & Potassium
30 ppm
Calcium
10 ppm
pH 7.5 to 8.0
The bidder shall design, manufacture and supply all the components (Viz.
water tank, piping, valves, strainer, drains, manifolds, injection nozzles etc.) of
the above mentioned compressor wet washing system of suitable grade of
material to handle the above wash water without any deterioration. The bidder
shall clearly specify the proposed grade of materials of the above components.
The bidder shall provide complete system including Demi Water Plant as per
manufacturer's recommendation (if required).
3.3.2.5 Governor System
The gas turbine unit shall be provided with a complete governing system which
shall be capable of maintaining a required constant speed under conditions of load
variations, control the turbine load, combustion gas temperatures and prevent
turbine over-speed. The characteristics of the turbine generator unit and its
governor shall be such that the machine operates satisfactorily in parallel with
existing generating unit in the system.
The speed governing system shall be provided with speed changing device
capable of local and remote control. Provision shall be made to shutdown the
turbine under emergency by local and remote control. The speed regulation shall
be adjustable (from no load to full load) between plus and minus 5 %. The rated
speed at no load condition shall be adjustable within ±0.5 % for easy
synchronising. The governing system for the unit shall also be provided with
automatic over-speed trip devices adjustable up to 110 % of the rated speed, and
a load limiter.
The governing system shall include an adjustable load limit control, minimum fuel
regulator, temperature limit control, temperature increment rate control and
necessary protection equipment.
The governing system shall be suitable for parallel operation with a large power
system and also for completely isolated and independent operation. In addition to
the automatic speed governing system, a separate emergency over-speed trip
mechanism and over combustion gas temperature trip system shall be furnished
on the unit.
These systems shall operate to shut the emergency fuel trip valves.
Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)
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