Maximum Allowable Inlet Pressure

The maximum allowable difference between the absolute pressure of the fluid at the inlet port and the absolute ambient pressure.
Calculating: Limited by the same factors as Maximum Allowable Working Pressure (MAWP).
Maximum allowable inlet pressure, also known as maximum allowable suction pressure (MASP), is the maximum allowable difference between the absolute pressure of the fluid at the inlet port and the absolute ambient pressure.
Maximum allowable inlet pressure can be established as the lowest pressure limit of the following 3 components:
1) Shaft Seal
2) Joint Seals
3) Port Connections
Knowing the maximum allowable inlet pressure is important so that the pump is operated safely. Exceeding the MASP can lead to damaging the pump or system.