NPSHA
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Net
Positive Suction Head Available (NPSHA)
The net positive
suction head available is a function of the pump suction system.
The Net
Positive Suction Head is the absolute total suction head in feet.
The NPSH
available in a flooded suction system is:
Atmospheric
Pressure (- ) Vapor Pressure (+) Liquid Height (-) Friction in the Suction Line.
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The NPSH
available in a suction lift system is:
Atmospheric
Pressure (-) Vapor Pressure (-) Liquid Ht. (-) Friction in the Suction Line.
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Calculating TDH-->page we would calculate
the NPSHA as follows:
NPSHA =
Atmospheric Pressure (-) Elevation Correction (-) Vapor Pressure (+) Suction Head
- Atmospheric
Pressure = 33.96 ft.
- Elevation
Correction for 2000 ft. = 33.96 ft. (-) 31.58 ft. = 2.38 ft.
Go
to Atmospheric Elevation Chart-->
- Vapor Pressure of
HCl at 150 F (Assume VP of HCl = VP of Water) = 8.56 ft.
Go
to Vapor Pressure Chart-->
NPSHA =
33.96 ft.(-) 2.38 ft. (-) 8.56 ft. (+) 8.7 ft. = 31.72 ft.
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