Refer to the drawing of an open system with subcooled water flowing through valves A, B, C and D (see figure below).
All valves are initially 50 percent open.
The inlet pressure to valve A is constant at 60 psia.
The initial steady-state inlet and outlet pressures for valve B are as follows:
Inlet pressure = 50 psia
Outlet pressure = 35 psia
After a single valve operation, the current steady-state inlet and outlet pressures
for valve B are as follows:
Inlet pressure = 48 psia
Outlet pressure = 36 psia
Which one of the following valve operations could be responsible for the difference between the initial and current steady-state inlet and outlet pressures for valve B?
A. Valve A was opened more.
B. Valve B was closed more.
C. Valve C was closed more.
D. Valve D was opened more.
Show Answer
Answer: D
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