Condensing steam turbine: why not warm up turbine before slow rolling? 1

[quickstepper]

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

 

[ChasBean1]

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.

 

[TheBlacksmith]

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

 

[TBP]

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.

 

[quickstepper]

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