Translations:Pumpen, Betriebs- und Regenwasserwerke/97/en

The friction loss in the suction pipe (H_vs) can be read from the diagram. Here, however, only the maximum discharge Q_SP is to be used in place of the total discharge ∑Q_R. The head loss in domestic piping (H_vr) is determined by the length of the pipe between the control unit and the fixture. With the usual combinations of flow rate and pipe diameter (e.g.: Q = 50 L / min, DN 25; Q = 27 L / min, DN 20; Q = 14 L / min, DN 15), there is an approximate loss of: