Strangschema drinking water installation - what is there to consider?

What is the stranding scheme in the drinking water installation, and what must be paid particular attention, explained in detail this post.

Branch plan

The laying of drinking water pipes in the house must be planned exactly. This alone is necessary to ensure the most efficient supply of all areas with pipes.

For the planning, a string schema is created first. This is sometimes called "interpretation" in technical jargon. The layout requires a floor plan of the building and an additional cutting plan.

At the beginning of the planning, all extraction fittings are drawn in, and connected via the most optimal string scheme possible.


For the planning of the drinking water installation in the house, especially the hydraulic aspects are decisive. The pressures, flow rates and pipe diameters must be calculated in the string diagram. Then the total flows are calculated.

The sections must be calculated, then the worst flow paths. The calculation of peak flow and the calculation of the circulation line are made afterwards.

The basis for the calculation of the lines in the string scheme is DIN 1988, part 300 in this area.

Only the calculation results in a feasible scheme of the pipe run with the appropriate pipe thicknesses, fittings and connections.

Hygienic aspects

In addition to the hydraulic aspects, hygienic aspects are also increasingly important. The water pipes must be designed in such a way that there are no large quantities of water left standing, as this can greatly increase the growth of bacteria.

In principle, all lines should be dimensioned so that there is no long service life of the water. This is not always easy to achieve - the larger a building, the more difficult it is to implement that aspect. In many cases, lifetimes are hard to avoid.

Even with an existing or planned rain use system, the transfer areas are often hygienically problematic. The separation into a hot water and a drinking water circuit should also be accomplished with the least possible installation.

Tips & Tricks

The design may only be carried out by a competent specialist company. The planning of drinking water installations is a very complex special task. The performer is also liable for proven planning errors.

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