June 2015

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HP Reliability: Update on steam turbine overspeed testing

An engineer working for a world-scale oil refinery in Asia-Pacific (AP) asked several questions on steam turbines: “I would like to know whether overspeed testing of steam turbines is recommended..

Bloch, Heinz P., Hydrocarbon Processing Staff

An engineer working for a world-scale oil refinery in Asia-Pacific (AP) asked several questions on steam turbines: “I would like to know whether overspeed testing of steam turbines is recommended or not. If yes, should it be done in coupled or uncoupled condition and should solo plates be installed on the coupling? What is the recommended frequency for this testing and what happens to the blades when an overspeed is reached?” Exact instructions needed First, this engineer should consult and implement the steam turbine manufacturer’s written instructions. A testing protocol is available and must be followed. Also, assume the facility had 1970s vintage overspeed devices design

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