Drinking water installation
The entire cold and hot water system for drinking water within a building from the water house entry (or the house water meter ) and the last mixer tap is referred to as a drinking water installation (or house installation ) . It is usually connected to the public drinking water network.
Definition and use of terms
The term drinking water installation (or in the spelling drinking water installation ) is defined in § 3 of the Drinking Water Ordinance of 2001 as "the entirety of the pipes, fittings and apparatus that are located between the point of transition of drinking water from a water supply system to the user and the Point of withdrawal of drinking water. ”It is also used in worksheet W 551 Drinking water heating and drinking water pipe systems, technical measures to reduce the growth of Legionella, planning, construction, operation and renovation of drinking water installations of DVGW e. V. The requirements and technical rules for drinking water installations are in the European standard for DIN EN 806, as well as in the German supplementary standards for this according to DIN 1988 part 100, for the protection of drinking water and drinking water quality, according to DIN 1988 part 200 for planning and Construction and standardized according to DIN 1988 Part 300 for calculating the pipe diameter.
Legionella problem
The problem of legionella in drinking water installations became an important issue with the amendment of the German Drinking Water Ordinance from 2011 and the new version of the DIN-DVGW standard in 1988.
Central drinking water heating systems in apartment buildings have since then had to be kept at 60 ° C. The return of the circulation line must not fall below 55 °. This does not apply to single and two-family houses. However, a minimum hot water temperature of 50 ° C is strongly recommended.
Since February 2012, DIN 1988 Part 300 has recommended the laying of a ring line as a floor line instead of individual stub lines for both cold water and hot water installations, so that there is no stagnation at unused tapping points .
Smallest possible pipe diameter
The aim of the calculation is to find the "smallest possible pipe diameter" using the maximum permissible pressure loss for each type of building. The German supplementary standard to DIN EN 806 is DIN 1988 Part 300 for calculating the pipe diameter differentiates between buildings with apartments, retirement homes, hotels, hospitals, schools and nursing homes.
The division of the apartments into several "usage units" serves the same purpose, with a maximum of two extraction points being taken into account for each of them. According to DIN 1988 Part 300, the pipe diameters of an additional circulation system for centralized hot water preparation are calculated using a new method. Compared to the previous design according to DVGW worksheet W 553, this method leads to lower volume flows.
literature
- DIN 1988 part 100, part 200, part 300 Technical rules of the DVGW for drinking water installation
- European standard for drinking water installation EN 806
- VDI guideline 6023, especially exchange rate
- Peter Reichert: Basics of Dimensioning , SBZ 14/15, 2012
- Robert Kremer: PV systems, ring lines with circulation and circulation heat pump. HLH BD 66 2015 No. 2 - February and No. 3 March
Individual evidence
- ↑ Drinking water heating and drinking water pipeline systems, technical measures to reduce the growth of Legionella, planning, construction, operation and renovation of drinking water installations (PDF) ( Memento of the original from June 26, 2013 in the Internet Archive ) Info: The archive link was inserted automatically and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. Publication of the DVGW e. V., accessed on January 31, 2016.
- ↑ Since 2014, meshed drinking water installations have also been proposed for larger systems. See "Detlef Orth and Robert Kremer: More hygiene through meshing , TGA specialist planner, September 2007, p. 49. Abstract online ".
