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 ?
Kumaraswamy, "Identification of critical net positive suction head from noise and vibration in a radial flow pump for different leading edge profiles of the vane," Journal of Fluids Engineering, vol.
Fortunately, in the pool industry, the net positive suction head available (NPSHA) necessary to avoid cavitation can be put into a very simple formula:
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. There are other concerns as well.
Cavitation is the result of insufficient net positive suction head as discussed above.
As a user, your primary concern is to prevent cavitation damage, which means adequate (NPSHR + 2 feet) net positive suction head available.
The pump supplier can help prevent cavitation by making sure that the net positive suction head (NPSH) available from the system is greater than the NPSH required by the pump;
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.