The greater the margin is between NPSHA and NPSHR, the better the pump will perform. A pump station design that has taken into account the proper calculations and maximizes NPSHA will be far superior to a pump station that has not been designed, with these factors in mind. The example pi...
For the last question, assuming the piping is totally full of liquid, the intermediate height does not affect the pump head calculation and 15' is the right answer. Although there is a pressure 'head' to get to that elevation, you get it all back when it falls back down. There are a...
The calculation should be made or the maximum ow quantity to be expected. *) Operation under suction li t conditions is only possible with sel -priming pumps. When using normal-suction pumps, suitable measures (e. g. by incorporating a non-return valve) must be taken to ensure that ...
A pump performance curve will usually include a NPSH requirement graph expressed in metres or feet head so that the NPSHr for the operating condition can be established. Pressure at the pump inlet The fluid pressure at a pump inlet will be determined by the pressure on the fluid surface, the...