This should be a minimum of one metre above the NPSH(r) value read from the pump performance curve, or the pump will cavitate. See our pump school for more information. This result relates to locations at sea level, deduct approximately 1m NPSH(a) for every 900m elevation above sea level. Temperature also reduces NPSH(a) by approx: 39°C=0.5m, 50°C =1m, 62°C=2m, 71°C=3m, 76°C=4m, 81°C=5m, 86°C=6m, 90°C=7m, 93°C=8m, 96°C=9m, 99°C=10m.
