Pump Smax & NPSH Calculator
Calculate the maximum suction height (Smax) for water pump installation
Input Parameters
Enter a value between 0.1 and 10 m.
Enter a value between 0 and 5000 m.
Enter a value between 5 and 50 °C.
Enter a value between 0 and 10 m.
Atmospheric Pressure (P₀)
10.34 m
101.33 kPa
Vapor Pressure (Pᵥ)
0.24 m
2.34 kPa
Smax Raw
7.10 m
Before suction losses
Smax Factored — Maximum safe pump height
6.60 m
Safe installation margin
Formula Breakdown
P₀ (atm. pressure)
=
101.325 × e^(−0/8435) = 10.335 m
Pᵥ (vapor pressure)
=
0.6105 × e^(17.27×20/257.3) × 0.102 = 0.238 m
Smax Raw
=
P₀ − Pᵥ − NPSH = 10.335 − 0.238 − 3.000 = 7.097 m
Smax Factored
=
Smax Raw − Losses = 7.097 − 0.500 = 6.597 m
Step 1 of 5