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Concerns surrounding backflow are quite serious and should not be easily dismissed. In the next edition of Plumbing Connection, I will continue to look into the issue and offer readers more practical advice on how to prevent a potential disaster.

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Backflow prevention devices are mechanical devices that require regular testing and maintenance. To facilitate this, they must be installed where ease of access is available. The Standard addresses some aspects, but each manufacturer outlines specific installation requirements in their published literature.

Always check the manufacturer’s published literature for the pressure drop curve to ensure you have enough available pressure to supply the amount of water required. This is especially important where a fi re connection is concerned.

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AS/NZS3500.1-2015 is called up in the National Construction Code, Volume 3, the Plumbing Code of Australia. Section 4 is Cross Connection Control and lays out the backflow prevention requirements mandated through legislation. When a state or territory calls up the National Construction Code in its plumbing regulations, unless otherwise stipulated, it makes the use of backflow preventers mandatory.

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Backflow prevention devices must be WaterMarked to AS/ NZS2845.1-2010 or AS/NZS2845.1-1998. This WaterMark is your assurance that the device has been manufactured and tested in accordance with the relevant Standard. If it does not have a WaterMark it should not be installed.

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WATTS LF009. Description. Reduced Pressure Zone Backflow Preventer, Series Watts 009, Size 2 in, Connection IPS, Body Material Lead Free Bronze, Temp. Range ...

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Whether you’re a hydraulic designer, plumbing consultant, contractor or commercial property owner, there are numerous decisions that you must make when considering a backfl ow prevention device, in particular a Reduced Pressure Zone Valve (RPZ). An RPZ is a s afety valve that protects a drinking water supply. They are used extensively but many people don’t understand how they operate or the limitations and constraints applicable to these devices.

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The abovementioned Standards also identify three levels of ‘hazard’ (i.e. contamination or pollutants that can come in contact with the drinking water):

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Backflow preventers rely on pressure drop across the check valves for effective operation. The minimum spring differentials are stipulated in the Standard and all watermarked devices must comply.

The assembly shall be FEBCO Series 765, or prior approved equal, and shall include a freeze sensor. Model/Option. FZ. Freeze sensor. U. Union end ball valves.

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Backflow Prevention Association of Australia president Peter Mclennan outlines everything you need to know if and when you are considering the use of an RPZ.

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All RPZ valves will dump water through the vent in the valve. It is a safety feature that ensures that if the device fails or there is a backflow event, the drinking water is protected. The spillage of water is often inconvenient, but when an RPZ valve is installed where water cannot get away, it can become dangerous to property and humans. All manufacturers publish the discharge rates applicable to their devices so be aware of these when you install an RPZ; otherwise, you may have a flood on your hands. For example, a 50mm RPZ with a pressure of 700kPa can discharge sufficient water to empty an Olympic-size swimming pool in six hours.

Testable backflow preventers are field tested for effective operation at least annually by an accredited tester trained in backflow prevention.