Description: required NPSH to give the operating performance; Name: Net positive suction head (req)
Description: minimum NPSH-value at the pump inlet connection required to give the rated or operating performance at the specified conditions; Name: Net positive suction head required
Description: ten times the logarithm to the base 10 of the ratio of the sound power of a source, p, to a reference value, p0, expressed in decibels; Name: sound output level