Answer / rudrappa

NPSH Required (NPSHR): The minimum pressure required at
the suction port of the pump to keep the pump from cavitating.
NPSHA is a function of your system and must be calculated,
whereas NPSHR is a function of the pump and must be provided
by the pump manufacturer. NPSHA MUST be greater than NPSHR
for the pump system to operate without cavitating. Put
another way, you must have more suction side pressure
available than the pump requires.

i am trying to select the correct grade steel for a shaft that will have a flap on it weighing about 4.5 tons being forced up with hydraulic rams. can someone tell me what grade the shaft should be and if it should be stainless steel or not

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