scope:

This standard applies, in conjunction with the DIN 1988 series and the DIN EN 806 series, to the design, installation, modification, maintenance and operation of drinking water installations in buildings and on properties, and serves as a basis for sizing pipes and for determining the size of components in circulation systems (circulation pipes, pumps, valves).

The sizing of cold and hot water pipes aims at selecting the smallest possible pipe inside diameter that ensures the minimum flow rate at all draw-off points during times of peak demand.

The detailed calculation method as described in this standard is suitable for all types of buildings.

NOTE For residential buildings with up to six dwellings, the sizing of cold and hot water pipes may also be in accordance with DIN EN 806-3 subject to the mains pressure being adequate and an acceptable water hygiene being ensured.