What is Backflow?
Backflow is a reversal of the normal direction of water flow in a water supply plumbing system. It occurs when the water delivery main is at a lower pressure than the internal plumbing system (back siphonage). Back siphonage can occur when there is a burst or ruptured water main, or due to excessive demand during fire-fighting operations. A backflow prevention device or air gap is used to protect a potable water supply (drinking water) from pollution or contamination.
Stay Compliant
The Water Corporation stipulates annual testing of all backflow prevention devices.
It is the property owner’s responsibility to ensure they are compliant by having your backflow prevention devices risk assessed and checked every year.
After Snap Plumbing have tested your properties backflow valve device, we will diarise the annual testing date for the following year. The Water Corporation will send a letter and our office will also send a reminder when it is due to be serviced again.
Testing
When a Snap Plumbing authorised Backflow Device Prevention specialist visits your property, they will check the condition of each part of the device. One or more of the valve device parts may require replacement to ensure the device is working properly.
The backflow device must be easily accessible for the backflow technician to test and repair. Some devices have drain ports and it is essential that these are able to drain freely without causing a problem or damaging nearby infrastructure.
Snap Plumbing’s testing kits are calibrated as per AS2845.3:2010. All testing, repairs, replacements, modifications and installations are completed as per AS3500.1:2018; AS2845.3:2010; Water Corporation WA requirements (Water Services Regulations 2013).
Online Lodgement direct to the Water Corporation
The Backflow test reports completed by our certified and,licenced technicians, will be lodged online directly to the Water Corporation. Snap Plumbing have customised test reports with our business name and logo mentioned on their customers copies, that the Snap Plumbing office will send you a copy for your records.
Installations
A backflow device needs to be installed in an accessible area with isolating valves, in addition to an inline strainer that reduces the chances of foreign materials entering the device.
There are many considerations when installing a backflow device, a correct risk rating needs to be done, pressure ratings, temperature ratings, the brand of device and where it is to be installed.
Our technician will discuss these considerations with you so you can make an informed decision.
Repairs
Backflow valve seals need to be watertight and able to withstand pressures of up to 1500kpa. Devices also contain spring mechanisms which can lose their tension strength over time, causing the valve to fail.
All backflow devices at some point in their life will require repair work. There are many components and each part needs to be checked, including its correct tolerance tension and general condition. It is also essential that all components are re-assembled using the correct tools and method, to ensure the correct operation of the device after the repair visit.