A SIF has a remote actuated valve energized and open. The valve must close when a demand
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A SIF has a remote actuated valve energized and open. The valve must close when a demand is detected. The valve is fitted to a piston-type pneumatic actuator that has an O-ring seal around the piston. This seal degrades with time, becoming sticky. If left in position for a long time period, it will cause the actuator to stick in place. How would this failure mode be classified?
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Related Book For
Safety Instrumented System Design Techniques And Design Verification
ISBN: 9781945541438
1st Edition
Authors: Iwan Van Beurden, William Goble
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