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Procedure of Turbine Cold Startup?

The procedure for a cold startup of a turbine involves checking various systems are operational, starting auxiliary systems slowly to warm components, and then slowly rolling and increasing the speed of the turbine. Specific steps include checking oil levels and pumps, starting condensate and gland steam systems, pulling a vacuum, warming lines with bypass systems, resetting and starting the turbine at low speed, and gradually increasing speed and load while monitoring parameters such as eccentricity and temperatures. The full startup is completed once the turbine has been synchronized and loaded up to its full capacity.

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2K views3 pages

Procedure of Turbine Cold Startup?

The procedure for a cold startup of a turbine involves checking various systems are operational, starting auxiliary systems slowly to warm components, and then slowly rolling and increasing the speed of the turbine. Specific steps include checking oil levels and pumps, starting condensate and gland steam systems, pulling a vacuum, warming lines with bypass systems, resetting and starting the turbine at low speed, and gradually increasing speed and load while monitoring parameters such as eccentricity and temperatures. The full startup is completed once the turbine has been synchronized and loaded up to its full capacity.

Uploaded by

sunil601
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Procedure of turbine cold startup?

The startup condition of the turbine is considered as per


inner casing temperature of the turbine such as,
a) Cold start up If the casing temperature is < 200C.
b) Warm start up - If the casing temperature in between
200-300C.
c) Hot start up- If the casing temperature is > 450C.
Pre checklist for cold start up:-
1) Check all work completed and all permit is returned.
2) Confirm all interlock test of turbine is completed.
3) Check all level gauges and pressure gauges in operation.
4) Check cooling tower sump level should be normal level.
5) Check the oil level of MOT tank and control oil tank
should be normal.
6) Check the generator cooling water and lube oil cooling
system is normalized.
7) Check the compressor is system in running .
8) Check the ACW pump in running.
9) Check the circulating water pump(CW) in running.
10)Check the turbine lube oil pump is running and turbine
is in barring gear.
11) Check the generator air cooling system is in operation.
Procedure for turbine rolling:-
1) Start the CEP with minimum re circulation.
2) Start the gland steam system with auxiliary PRDS.
3) Start the gland steam blower and normalize Gland steam
drain system.
4) Maintain the gland steam temperature in between 121
to 177 deg c.
5) Start the vacuum pump or ejector for vacuum pulling.
6) Ensure the boiler develop rated pressure above 15
kg/cm2 & temperature >360deg c
7) Put the HP and LP bypass system in operation for line
warm-up.
8) Ensure all turbine drains are open condition.
9) Check the turbine lube oil temperature is in-between 38-
42 deg c.
10) Check the differential expansion and eccentricity is
normal.
11) Reset the turbine from governor panel.
12) Press the latching or start bottom to open the ESV.
13) Give command for rolling of turbine.
14) Check the turning gear and JOP automatically stopped
when speed reaches >300 rpm.
15) Press the hold button of turbine and hold the speed in
500rpm to check the eccentricity < 0.076 mm, axial shift +-
1 mm and differential expansion +- 6mm of turbine.
16) Continue the speed of the turbine with 40 rpm/min and
speedup the turbine speed during critical speed of
1850,2000 and 2200 respectively (as per designer).
17) Check the main oil pump comes in service and AOP is
stopped condition.
18) After turbine reached to full speed hold for some time
and ensure upper and lower casing temperature difference
is within limit.
19) Ask the electrical people for synchronization.
20) Close all turbine drains after synchronization.
21) Increase load by follow of turbine cold startup load
curve.
22) When the load is increase to 20% of full load charge the
Extraction line gradually.
23) Finally check all parameter of turbine is ok and increase
turbine load to full.
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