Water Supply Industry Interpretations and Advice
- Area of Interest : Backflow prevention
- Topic : Fluid category
- Title : Cement batching plant
- Clause Reference : Schedule 2 paragraph 15 & G15.3
- Reference Number : B25
- Decision Date : October 2002 (Revised May 2004)
Cement mortar batching plant, where the mortar materials are heated and dried sufficiently to minimise the risk of micro-organism contamination, may be accepted as being a fluid category 3 risk. Plants producing ready-mix concrete are unlikely to use heat dried and disinfected aggregate and are recognised as a fluid category 4 risk. If such equipment makes use of a RPZ valve for backflow protection the valve should be tested either on relocation of the plant between building sites or at six-monthly intervals, whichever is more frequent.