Dear Norm – From an operator’s point of view, what is the best way to operate a steam turbine? What are the two valve handles on either side of the speed governor for? How do we operators know what speed to set the turbine to operate at? Our engineer just tells us to operate at the turbine’s design speed. Is this right?
--James , Oklahoma
James – Operate turbine speed to keep downstream process control valve in a mostly open but still controllable position. Alternately, connect the governor directly to the process variable to be controlled. That is, control an upstream level by directly varying turbine steam supply flow. The two valves you refer to are called horsepower or port valves. If the governor was a delta P of more than 5% of the motive steam pressure, close one of the port valves until the governor is mostly open.
-Norm
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