Scope of application and dimensioning

Scope of application and dimensions

Generally, all fixtures, which can be supplied by rainwater harvesting, can be connected.

Pressure line dimensioning

The system is dimensioned with consideration of the required operating volume flow rate in Germany according to DIN 1988-3. 

Toilet and urinal

Toilet and urinal

You can connect multiple toilets and urinals.

Washing mashine

Washing machine

You can connect multiple washing machines.

Note: Drip irrigation systems require a special design in combination with an expansion vessel.

Garden and Cleaning

Garden and cleaning

You can connect all types of garden fixtures and cleaning devices.

Pump curve for RM Favorit and RM Favorit-SC

Pumping characteristics of RM Favorit

Pump curve for RM Favorit-SC Duplex and Triplex

Pumping characteristics of RM Favorit-SC Duplex and Triplex version

Suction line dimensioning

In practice, the pump is self-priming only in a certain range because of pressure losses (ie. pipe friction, intake level). In this operating range, the pump evacuates the air from the suction line independently (ie. with initial commissioning). The suction curve below shows the dependence of suction length on the intake level. The determined value must be above the represented suction curve in the diagram. If the intake point is below the suction curve, then a charging pump (optional accessory RMF-LP) will be necessary to ensure the intake process proceeds reliably and with sufficient supply.

Intake side dimensions

Note: The charging pump boosts the intake pressure, so that the intake level can be increased by 3 m. This means that the suction curve moves 3 m parallel down.

Sample dimensioning

Example A:
Suction pipe length = 12 m
Intake level = -2.40 m (Height difference between deepest intake position and pump) = o.k., since the point of intersection lies above the suction curve

Example B:
Suction pipe length = 18 m
Intake level = -3,20 m (Height difference between deepest intake position and pump) = not o.k., since the point of intersection lies below the suction curve

Accessory: Charging pump RMF-LP (Art. No. 22 00 76) required in order to support intake

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