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: group of construction elements with the same construction features and the same construction for the transportation of media which are combined due to similar production techniques for the construction admittance examination and quality conformity controls; Name: Construction type conveying element