Hazard class (drinking water)
Liquids are classified in house and installation technology according to their hazard class . The hazard is the contamination of the drinking water if process water and waste water accidentally flow back into the drinking water line or are sucked in .
The risk depends on the type of the flowing back substance, which is divided into liquid categories according to DIN EN 1717 . These largely correspond to the liquid classes specified in the temporarily still valid DIN 1988 Part 4 .
Backflow is prevented by using safety fittings .
There are five hazard classes.
| Liquid category | Type of hazard according to EN 1717 or DIN 1988-4 |
|---|---|
| 1 | Without endangering health and without impairing the smell , taste or color . Example: heated drinking water (= service water) |
| 2 | Without endangering health with impairment of smell, taste, color or temperature Example: coffee , tea , rust water. |
| 3 | With a risk to health from a few toxic substances, for example: glycol , caustic soda , heating water without additives, copper sulphate solution . |
| 4th | With endangerment of health through toxic, very toxic, carcinogenic, mutagenic or radioactive substances with danger to life. Examples: chemicals, paints , dry cleaning, galvanic baths , insecticides . |
| 5 | With health risks from microbial or viral pathogens of communicable diseases, if there is a danger to life. Example: hepatitis viruses , salmonella |
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- ↑ Dipl.-Ing. Tino Reinhard: The meaning and content of DIN EN 1717 - system standard regulates drinking water protection across Europe , IKZ Haustechnik, issue 13/2006, p. 32ff
- ↑ Tino Reinhard: Safety concept and safety fittings according to DIN EN 1717 in energie | wasser-praxis , October 2008 edition, online at www.fachzeitschriften-wvgw.de ( Memento from June 16, 2012 in the Internet Archive )