What is Backflow?

Backflow Terms & Definitions


Backflow:

1) Flow in a direction contrary to the normal or intended direction of flow.

2) The unintended flow of water from a potentially polluted source into a potable water supply.


Backflow Prevention Device:

A device to prevent the reverse flow of water from a potentially polluted source into a potable water supply system.


Potable Water:

Water that is suitable for human consumption, food preparation, utensil washing and oral hygiene (see AS 4020).


Non Potable Water:

Any water other than drinking/potable water.


Reduced Pressure Zone Device (RPZD):

A device to prevent Backflow caused by either back-siphonage or back-pressure in a water reticulation system, which incorporates two independently operating force loaded non-return valves and automatically drains to waste whenever the pressure in the system between the upstream and downstream non-return valves reduces to a pressure not less than 14kpa below the pressure at the inlet to the upstream non-return valve. 


Double Check Valve:

A device to prevent Backflow caused by back-pressure, and which has two independently operating force loaded non-return valves and incorporates specific test points for in-service testing.


Cross-Connection:

Any connection or arrangement, physical or otherwise, between any potable water supply system either directly or indirectly connected to a water main, and any fixture, storage tank, receptacle, equipment or device through which it may be possible for any non-potable, used, unclean, polluted or contaminated water, or any other substance, to enter any part of such potable water system under any conditions.



AVOID NON COMPLIANCE !

GET YOUR BACKFLOW TESTED