To Norman Lieberman – Can we safely operate a topping steam turbine if the governor speed control valve is out of service and the over-speed trip is working correctly?
--Carl , Texas
Carl – No. If you are controlling the turbine speed manually, then a reduced load to the turbine will cause the turbine to over-speed and trip. Sooner or later, operators will tire of the repeat trips and “wire-up” the over-speed trip mechanism (i.e., disable the over-speed trip protection). It’s an industry wide problem that has resulted in injuries and death. The only answer is that both the governor and trip must both be working. See my book, “Troubleshooting Process Plant Control,” Wiley Publications.
--Regards, Norm
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