A vertical safety valve with a 3-inch diameter disk has a spring applying 1,000 lbf to the top of the valve disk in opposition to system pressure.
Which one of the following is the approximate system pressure at which the safety valve will begin to open?
A. 35 psig
B. 111 psig
C. 141 psig
D. 444 psig
Show Answer
Answer: C
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