A completely full water storage tank is being hydrostatically tested to 100 psig using a positive displacement pump (PDP) with a smooth and constant discharge flow rate of 10 gpm.
The tank is protected by a safety valve and a relief valve; both valves discharge to the atmosphere.
Each valve has an opening setpoint of 105 psig and a maximum rated discharge flow rate of 6 gpm.
The PDP is inadvertently left running when tank pressure reaches 100 psig.
With the PDP still running, tank pressure will stabilize __________ 105 psig; and the greater mass flow rate will be coming from the __________ valve.
A. at; safety
B. above; safety
C. at; relief
D. above; relief
Show Answer
Answer: B
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