How does a backflow test work?
The testing process involves using valves on the backflow testing device, known as gate and relief valves. Essentially the plumber will be closing valves and checking for changes in gauge movement, water leaks and other clear signs. There are specific criteria that needs to be met during the testing process.
What is the minimum acceptable value for the second check of the reduced pressure principle assembly?
When testing a Reduced Pressure Principle Assembly, the pressure differential relief valve must operate to maintain the zone between the two check valves at least 2.0 psid less than supply pressure. Also, the second check valve on a RP must be 1.0 psid or greater.
What happens if you don’t do backflow testing?
WHAT HAPPENS IF I DON’T HAVE MY BACKFLOW DEVICE TESTED? If you don’t respond to the demand for backflow testing, your water service will ultimately be suspended. After your first notice, you will generally have 30 days to have your device tested.
Where is the backwater valve located?
Backwater valves are usually located in the floor of your basement. If you know where to find your sump pump, the backwater valve is probably nearby. There may be a rectangular panel on top, but often the compartment itself is clear so that you can see inside relatively easily and the round cap can be removed.
How much pressure does a backflow preventer need?
The static differential pressure across the no. 2 check valve must be at least 1 psid. Install between 12″-30″ above the floor or finished grade with adequate clearance for testing and maintenance. If installation is in a pit or vault, provide ample drainage to ensure the backflow preventer does not become submerged.
How do you test for low pressure backflow?
Open the high “A” valve. Slowly open the low “B” valve no more than ¼ turn. Hold the valve at this position and observe the gauge reading at the first moment the first discharge is noted from the relief valve. Record this as the opening differential pressure of the relief valve on the test report form.
Can a backflow preventer fail?
The faulty first check valve is one of the most common problems that could cause your backflow preventer to fail. The space between the first and second check valves is freed up by the opening of the first check valve in a reduced pressure backup preventer.
Can you do backflow testing yourself?
In order to do a backflow test yourself, you need an extensive amount of knowledge about appropriate water pressure as well as your valves and system. Even if you do decide to put in the time and effort to learn about your home’s backflow, it is extremely easy to misread the test results.
How do you do a backflow tester?
Provide a copy of successfully passing a formal backflow prevention course. Be employed by a California State Licensed Contractor or possess a State Contractor’s License. Submit a Certified Backflow Tester Application with fee of $340.00 (checks/money orders payable to: Los Angeles County Public Health ).