Hygiene in drinking water installations for cold and warm water
„Water must flow“; Implementing operational use as intended through hydraulic alignment and forced flow-through. For that, KEMPER
provides an innovative total concept to implement and maintain drinking water hygiene in cold (CDW) and warm (WDW) drinking water under the name „KEMPER KHS (KEMPER Hygienesystem)“. The KEMPER KHS goals are:
provides an innovative total concept to implement and maintain drinking water hygiene in cold (CDW) and warm (WDW) drinking water under the name „KEMPER KHS (KEMPER Hygienesystem)“. The KEMPER KHS goals are:
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Preventative measures and stagnation avoidance in drinking water systems
- Securing and retaining drinking water quality at the tapping point according to TrinkwV 2001
- Retaining drinking water hygiene using economically implemented flushing measures in the CDW area
- Calculating, simulating and implementing drinking water installations in WDW and DWC
The system ensures that high quality, fresh water can always be tapped from the withdrawal point. The main goal of the Kemper hygiene system is preventing stagnation and the consequential, negative impairment of the DW quality.
In professional circles, „stagnation“ is considered one of the main causes for the growth of germs and for drinking water to be transformed into non-potable water.
„Old unused lines or line sections not used as intended underlie permanent stagnation making them a potential source of problems in the drinking water system“.
It is usually recommended to separate the unused lines from the drinking water system or to regularly force flow them as intended. Use as intended here means that an originally planned user frequency or frequency of drinking water withdrawal must be laid down as the basis. If the planned intended usage of the drinking water consumption does not occur in line sections, pathogens can close down the entire operation throughout the whole drinking water system.
According to the drinking water regulation (TrinkwV 2001), drinking water is always „Water for human consumption“. The requirements placed on the water withdrawal point must be maintained by the drinking water system operator. The requirements involve both the cold drinking water, CDW, as well as warm drinking water, WDW.
During an expert panel (1) on 31-Mar-04 in Bonn, it was clearly formulated:
The obligation to comply with the generally accepted rules in technology for the operators of building installations are a consequence of the TrinkwV, § 4, (1) in association with § 3 No. 2 Letter c.
The actual situation today
Stagnation exists and leads to problems in the drinking water quality. In individual cases, comprehensive flushing measures are needed. To maintain the drinking water hygiene in public buildings and in apartment construction (empty apartment state), especially just before sampling and also in general, periodically reactive, large volumes of drinking water are used uncontrolled to flush the drinking water system. The consumed amounts are often unknown and excessive. Flushing is ineffective because it is not monitored and not comprehensive.
The flushing measures are stipulated by the technical and hygiene personnel and carried out manually with great efforts by employees by opening and closing valves in around the drinking water installation and the water tapping valves. That results in high operating and personnel costs for flushing. Hygienists consider drinking water building installations to be potential infection reservoirs.
Warm drinking water and drinking water circulation
(WDW and DWC)
KEMPER has been pushing the "hydraulic alignment of circulation systems" according to DVGW W 551 and W 553 to achieve flawless hygienic conditions using regulation valves for over 10 years in the warm drinking water sector. The solution in WDW systems to prevent excessive germ counts in the microbiological area is to maintain water temperatures between 55 °C and 60 °C throughout the entire pipeline system. Kemper uses statically and thermally controlled circulation regulation valves to accomplish that. In addition, the WDW/DWC system is supported by the calculation software and simulations. That makes the hydraulic interaction of piping systems, circulation pumps and regulating valves visible even before the drinking water system is implemented or also for already existing WDW systems so they can be accordingly economically optimised.
Cold drinking water (CDW)
In the CDW sector, KEMPER has travelled a different path for „flawless drinking water hygiene“. Drinking water hygiene for cold water is achieved using focused flushing measures combined with forced-flowing the ring line systems. In the CDW sector, the highest goal is to maintain "low temperatures" of around
< 25 °C and less to prevent increased germ counts in the microbiological area. By using exact flushing programs, based on configuration software that Kemper developed, along with suitable valve technology allows low temperatures and thus allows fresh water to be withdrawn at any tapping point.
< 25 °C and less to prevent increased germ counts in the microbiological area. By using exact flushing programs, based on configuration software that Kemper developed, along with suitable valve technology allows low temperatures and thus allows fresh water to be withdrawn at any tapping point.