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The detailed requirements arising from the technical criteria can be summarised in a small number of protection targets. Below, you will find notes on each of the protection targets with due regard to the requirements of the healthcare sector:. W For modern water supply systems it means above all that pipes need to have suitable dimensions for their purpose, taking account of the conditions of simultaneousness DIN which occur in the healthcare sector.

It means that planners have a special responsibility when determining the simultaneousness factors. Depending on the hazard category of a given appliance, a safety device must be added. If therelevant machinery or appliance bears a DVGW certification label, then it is considered to be intrinsically safe and can be connected without the need for further measures. In the case of bathroom fittings with hand or fixed shower attachments there is the danger of point-of-use backflow.

Safety devices integrated into taps serve to protect the drinking water against such hazard, making GROHE taps intrinsically safe. Anticorrosion requirements Drinking water supply systems may suffer not only interior corrosion, but also contact corrosion, the formation of elements and exterior corrosion.

DIN lays out the different types of corrosion and specified measures to ensure that planning and implementation meet anticorrosion requirements. Planning a drinking water supply system Standards and guidelines. Prevention of leaks and of the intrusion of contaminants Once completed, an installed pipe system must be given a pressure test under the ZVSHK procedure sheet. For hygienic and practical reasons, pressure testing should be conducted with either air or inert gas.

If water is used for pressure testing, then the system must be started up immediately after the test, to ensure regular water renewal through flushing schedules. While laying pipes, it is important to ensure that no impurities can get into the system through any of the apertures.

Prevention of stagnant areas Stagnant water in pipes has a detrimental effect on the quality of the drinking water and must be viewed in similar terms as exceeding the use-by date of a food item.

The German industry standards DIN and DIN therefore specify that water must not remain stagnant during planning, construction or operation. Bypasses without any flow are not permitted. Flushing and, where appropriate, disinfection of drinking water supply systems upon start-up Drinking water supply systems must be thoroughly flushed upon start-up.

Flushing must always involve the use of filtered drinking water. To prevent the occurrence of pollutants, domestic systems that have been stagnant for a long time must be flushed thoroughly in coordination with the relevant water utility before the supply system is filled again. Regular inspection of systems Like all other technical systems, drinking water supply systems must be inspected at regular intervals under DIN and must be given appropriate maintenance.

VDI sheet 1 provides a wide range of answers to questions on inspection and maintenance and contains a number of checklists. Disconnection of whole systems and parts of systems that are no longer in uset Pipes and systems that are no longer used for their intended purpose and which are therefore stagnating must be disconnected. Until this has happened, they continue to be part of the drinking water supply system and must therefore be flushed regularly.

Requirements on water treatment systems filters, metering devices, ion exchangers designed to prevent germination and to ensure observance of limits for chemical substances All water treatment systems must meet the requirements of DIN and be correctly dimensioned.

Any systems that differ from those specified above -- e. If substances are added to the drinking water, then users must be notified. When planning and building cold water supply pipes, it is therefore important to ensure that there are no inadmissible increases in temperature. According to VDI sheet 1 any pipe systems with warm or hot water must be fed through different shafts and ducts. If water pipes for cold drinking water are situated next to warm or hot pipes in a given slot, then DIN stipulates that they must be given the same insulation as pipes in heated rooms.

Prevention of wet fire extinction pipes as potential sources of contamination If wet fire extinction systems are connected directly to the drinking water supply system, then this creates hygiene risks which cannot be controlled. Fire extinction and fire proofing systems are rarely used for their intended purpose. All planning, construction and operation must therefore ensure either that water does not turn stagnant or that it is kept away from the drinking water system with absolute certainty.

Since the publication of the German industry standard DIN it has no longer been possible to connect type F wall hydrants directly to drinking water supply systems. Moreover, the new draft DIN 60 contains even more stringent requirements on drinking water hygiene. The aim is to separate drinking water and fire extinction systems from each other through a multi-barrier system wherever this is possible. W describes measures for the prevention of legionella growth in drinking water heating and supply systems.

Good circulation right up to the last tap on the top floor brings not only hygienic benefits but also user convenience. DIN EN also requires protection against hot surfaces.


Basic requirements for hygiene-conscious planning

DVGW International. The German gas supply system is safe, efficient and eco-friendly. Hence, it has been ranking top for decades by European and international comparison. Thanks to the highly efficient DVGW safety regulations, gas is one of the safest and best-accepted energy carriers. Our groundwater is jeopardised by intensive livestock farming and overfertilisation. Natural gas as an alternative fuel can help to reduce CO2 and other transport-related pollutant emissions quickly and cost-effectively.


DVGW W 551:2004-04


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