subject: Backflow Testing 101 [print this page] Large residential and commercial plumbing systems require regular backflow testing to ensure that drinking water is not contaminated by polluted water that has come back through a faulty backflow prevention system. But what exactly is backflow testing, a backflow prevention system and why is regular testing so important? Today we provide you with a brief introduction to the topic, courtesy of the friendly team at Plumlink. Read on to find out more...
Why is it important to prevent backflow?
In modern water supply plumbing systems water is usually maintained at enough pressure to enable it to flow from a tap, shower or other fixture. But when this pressure fails or is reduced, for instance when a main pipe bursts, the pressure may not be enough and may allow water from another location to be drawn back into the system.
Think of an underground backyard sprinkler system. If the pressure to this system isnt maintained, and vacuum can occur and excess water can be sucked back up into the original source of potable water. Any pesticides or other pollutants that you may have in your lawn and gardens can also be drawn back into the water supply, quickly contaminating it and those who drink it from another fixture. The easiest way to prevent something like this happening is to install a backflow prevention device.
What is a backflow prevention device?
A backflow prevention device is a system that is installed to protect water supplies from contamination or pollution caused by backflow. It is especially important when chemicals are used, such as commercial descalers in boilers or bleaches in residential power washing. Typically, a backflow prevention device has test cocks and shut-off valves to prevent the water from flowing back into the supply.
In most developed countries, where there is a possibility of backflow, approved and certified backflow prevention devices are required by law and must be installed in accordance with local building codes. Local building regulations also govern how often the backflow prevention device needs to be tested and repaired, but a yearly check is typically recommended.
There are a number of different backflow prevention devices, including:
Air gap
Atmospheric vacuum breaker
Chemigation valve
Double check valve
Pressure vacuum breaker assembly
Reduced Pressure Principle Valve
Reduced pressure zone device
Why is regular testing so important?
Regular testing of backflow prevention devices is important to maintain the integrity of the water supply. Backflow prevention devices, just like any other mechanical device, suffer from wear and tear and can sometimes fail. Regular testing ensures that the device is working as it should and the water supply is protected from potentially harmful contamination.
We hope this brief introduction to backflow prevention devices and their importance, as well as the importance of regular testing, has been a good source of educational information. If you need certified and experienced plumbers to conduct your regular backflow testing, we recommend the team from Plumlink. They regularly conduct backflow test for residential and commercial property owners and enjoy a great reputation in South East Queensland.
