What does vapor pressure affect in pump selection?
A. The liquid’s viscosity
B. Net positive suction head
C. The horsepower required by the pump
D. The pressure that exists at the suction beginning of a pump
A. Incorrect. The pump selected must be appropriate for the liquid’s viscosity, but the viscosity does not affect vapor pressure.
B. Correct. The vapor pressure of the liquid affects the net positive suction head (NPSH), or the pressure that exists at the suction end of a pump.
C. Incorrect. Density and specific gravity affect the horsepower required by the pump.
D. Incorrect. The vapor pressure of the liquid affects the net positive suction head (NPSH), or the pressure that exists at the suction end of a pump.
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