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Condensing steam turbine: why not warm up turbine before slow rolling?

Condensing steam turbine: why not warm up turbine before slow rolling?

Condensing steam turbine: why not warm up turbine before slow rolling?

(OP)
Hi, I would like to know the specific reasonoing for not warming up the condensing steam tubine withsteam thru the T&T valve.

RE: Condensing steam turbine: why not warm up turbine before slow rolling?

Warming the unit before rolling it could slightly bow the rotor due to the weight of the turbine, which could cause vibration and damage when motion starts.

RE: Condensing steam turbine: why not warm up turbine before slow rolling?

You might also accumulate more water in the casing then it is designed for and cause a problem.  These are generally robust units, just start them up and let them run normally.

Blacksmith

RE: Condensing steam turbine: why not warm up turbine before slow rolling?

If the turbine is large, the mass of metal that is the rotor needs to be heated evenly on start-up, and cooled evenly on shut-down. Failure to evenly heat/cool large turbine rotors can result in shaft distortion and vibration.

RE: Condensing steam turbine: why not warm up turbine before slow rolling?

(OP)
Thanks a lot guys................the explaination is necessary for a training session on these turbines and their associated piping.

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