A completely full water tank is being hydrostatically tested to 180 psig using a positive displacement pump (PDP) with a smooth and constant discharge flow rate of 6 gpm.
The tank is protected by two relief valves that discharge to the atmosphere.
The relief valves have the following characteristics:
- Relief valve A opening setpoint is 180 psig with an accumulation of 5 percent.
- Relief valve B opening setpoint is 200 psig with an accumulation of 5 percent.
- Each relief valve has linear flow rate characteristics and a maximum flow rate of gpm.
The PDP is inadvertently left running when tank pressure reaches 180 psig.
With the PDP still running, at what pressure will the tank stabilize?
A. 190 psig
B. 195 psig
C. 205 psig
D. 210 psig
Show Answer
Answer: C
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