net positive suction head


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.