net positive suction head


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net positive suction head

[′net ′päz·əd·iv ¦sək·shən ‚hed]
(mechanical engineering)
The minimum suction head required for a pump to operate; depends on liquid characteristics, total liquid head, pump speed and capacity, and impeller design. Abbreviated NPSH.

net positive suction head

The absolute pressure available at the inlet to a pump; the most important factor in determining the performance of a pump.
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References in periodicals archive ?
With this information, look at the manufacturer's pump curve and determine the pump's flow rate and the required net positive suction head (NPSHr) corresponding to that operating point on the pump curve.
This is accomplished by ensuring the refrigerant being pumped has adequate net positive suction head (NPSH).
As long as the NPSHA is greater than or equal to the Net Positive Suction Head Required (NPSHR) on the pump curve, cavitation will not occur.
Vapor pressure is a factor in determining Net Positive Suction Head Available.
To confirm whether a given pump will operate properly within the system, you must know more about the Net Positive Suction Head (NPSH).
To bring you back to earth, we have seen the adverse effect of speed on net positive suction head.
The maximum speed at which a pump should operate is determined by the net positive suction head available at the pump, the quantity of liquid being pumped, and the total head.