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

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The friction loss in the suction pipe (Hvs) can be read from the diagram. Here, however, only the maximum discharge QSP is to be used in place of the total discharge ∑QR. The head loss in domestic piping (Hvr) 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: