Description: Ratio of the power requirement of the pump reduced by the mechanical power losses  to the power requirement of the pump under certain working conditions.; Name: mech eff
Description: proportion of the pump power input, p, available after satisfying the mechanical power losses, pj,ab, at given operating conditions; Name: mechanical efficiency
Description: total pressure (including velocity pressure) at the pump inlet connection less the liquid vapour pressure at the present temperature of the liquid; Name: net positive inlet pressure available