Which one of the following is a generally accepted method for locally verifying that a manual valve is fully closed in a depressurized piping system?
A. Check a downstream flow gauge to be indicating zero flow.
B. Compare an upstream and downstream pressure gauge to ensure zero differential pressure.
C. Attempt to turn the valve handwheel in the close direction and verify no movement.
D. Attempt to turn the valve handwheel in the open direction and verify movement.
Show Answer
Answer: C
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