Interview Questions on Steam Turbines

A light read for those of you into steam turbines:

How many governors are needed for safe turbine operation? Why?

Two independent governors are needed for safe turbine operation:

One is an over speed or emergency trip that shuts off the steam at 10 percent above running speed (maximum speed).

The second, or main governor, usually controls speed at a constant rate; however, many applications have variable speed control.

How will you detect that misalignment is the probable cause of excessive vibration?

Coupling to the driven machine is to be disconnected.

The turbine is to be run alone.

If the turbine runs smoothly, either misalignment, worn coupling or the driven equipment is the cause of the trouble.

If you have any turbine questions, or problems with mechanical governors, such as Woodward, contact our Hydro team!

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