The required NPSH of a pump is to be 8 ft. Determine the vertical distance (ft) above or below the pump axis from a vented surface of water (25°C) in a supply tank if suction side friction losses are equivalent to 3.8 ft.

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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4) The required NPSH of a pump is to be 8 ft. Determine the vertical distance (ft) above or below
the pump axis from a vented surface of water (25°C) in a supply tank if suction side friction
losses are equivalent to 3.8 ft.
Transcribed Image Text:4) The required NPSH of a pump is to be 8 ft. Determine the vertical distance (ft) above or below the pump axis from a vented surface of water (25°C) in a supply tank if suction side friction losses are equivalent to 3.8 ft.
NET POSITIVE SUCTION HEAD (NPSH):
the difference between the static head at the suction inlet and the head
corresponding to the vapor pressure of the liquid at the pump inlet
9c (Par – P,
NPSH =
suction
- Za
g
TI
where:
Pa' = abs. Pressure at the surface of the reservoir
Pv = vapor pressure
Za = height from the surface of the of the reservoir to the suction point in the
pump
ERSITE
Transcribed Image Text:NET POSITIVE SUCTION HEAD (NPSH): the difference between the static head at the suction inlet and the head corresponding to the vapor pressure of the liquid at the pump inlet 9c (Par – P, NPSH = suction - Za g TI where: Pa' = abs. Pressure at the surface of the reservoir Pv = vapor pressure Za = height from the surface of the of the reservoir to the suction point in the pump ERSITE
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