TESTO 324 - Drinking Water (ZVSHK Sheet as Per DIN en 806-4)

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6.2.6. Drinking water (ZVSHK sheet as per DIN EN 806-4)
The drinking water pipes are tested for tightness before
commissioning using air/inert gas or water. For reasons of hygiene,
it is best if the pipes remain dry until shortly before commissioning
and do not undergo a main test using water. It is also
recommended that a pressure test be carried out with air as a
preventive measure against corrosion in metallic materials.
There are 2 different test types to choose from:
• Testing with air
The main test should be carried out with air if:
- Following the main test, there is prolonged downtime to
eliminate the possibility of bacterial growth
- Following the main test, the pipe system cannot remain
completely filled (e.g. frost period)
- The corrosion resistance of a material of a partially-filled
pipe is compromised
- In buildings with more stringent hygienic requirements (e.g.
hospitals), it may be necessary to use inert gases to
eliminate the risk of condensation of humidity in the pipeline.
• Testing with water
The main test should only be carried out with water if testing is
taking place shortly before the commissioning of a drinking
water system. According to the ZVSHK sheet as per DIN EN
806-4, there are three different test methods. These depend on
various material properties.
The main test with water can only be carried out if:
- From the main test up until the drinking water installation is
commissioned, the water is changed regularly (after 7 days
at the latest).