Part B5 Cross-connection control
NSW B5D6 RainwaterNew for 2022
Delete clause B5D6 and insert NSW B5D6 as follows:
B5D6 applies to scenarios not covered by S41C6(1)(b).
NSW B5D7 Cooling tower water service2019: NSW B5.501
Insert NSW clause B5D7 in clause B5D7 as follows:
Water systems permanently attached to cooling towers backflow prevention shall be positioned so that—
- cooling tower air gap must be measured from the rim of the cooling tower basin; and
- if a drinking water service to the cooling tower passes through the basin, the service pipe must be provided with a double wall protection; and
- if a fast fill connection is required, the fast fill line shall terminate externally to the unit, with an air gap over either the basin or a tundish.
See NSW Figure B5D7 for typical cooling tower connections.