Water Supply Industry Interpretations and Advice
- Area of Interest : Backflow prevention
- Topic : Fluid category
- Title : Flushing water systems prior to commissioning
- Clause Reference : Schedule 2 paragraph 15 & G15.3
- Reference Number : B12
- Decision Date : February 2002
The Fluid Category risk of a newly installed water plumbing system before flushing and commissioning is considered to be not more than Fluid Category 3. Rapid filling of the system would be permitted using a temporary connection by means of a hose of no greater than 25mm (1”) diameter, protected against backflow by a double check valve, unless a risk assessment, taking into account specific circumstances, indicates that a higher level of backflow protection is required.