Refer to the drawing of a water storage tank with a differential pressure (D/P) level detection system (see figure below).
Assume that the initial temperature of the reference leg and the water in the tank are the same, and that reference leg temperature and level do not change.
The level detector is being used in a level control system (not shown) that is calibrated to maintain tank level at 75 percent at the current tank water temperature (70°F) and pressure (5 psig).
If the tank water temperature remains constant, but the tank pressure is increased by 10 psig, the level control system will cause actual tank level to…
A. remain at 75 percent.
B. increase and stabilize above 75 percent.
C. oscillate around 75 percent.
D. decrease and stabilize below 75 percent.
Show Answer
Answer: A
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