What are NPSH and suction power of a pump?
It is the acronym of Net Positive Section Head and it is the total suction head – in m – determined at the suction nozzle and correct to datum, less the vapour pressure of the liquid – always in m -. In other words it is an analysis of energy conditions of suction side of a pump to determine if the liquid will vaporize at the lowest pressure point in the pump. To ensure that a pump works correctly along the whole performances curve, it is necessary, for each point of the curve that: NPSH available > NPSH requested.
