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Backflow Exam QuestionAnswerWhat is the pressure at the base of a 100-foot high stand pipe filled with water?43.3 psiA column of water exerts pressure at the bottom of a column due toThe weight of the water45 more rows
The most common time we see assemblies fail is after a repair to the mainline has been done. In the event that you had some work done, or had a broken pipe, sometimes pipe shavings and/or pieces of pipe can get caught between the checks or poppits, that can cause the checks not to seal.
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.
They must not only be tested annually, but rebuilt every five years. If not, there could be serious harmful backflow. If you discover anything amiss in the testing of the backflow preventer, it is a good idea to handle it right then.
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.
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About Certified Backflow Testers In order to protect our drinking water quality and prevent the spread of infectious disease and other contaminants, mechanical backflow prevention assemblies are utilized to prevent used, unclean or contaminated water or substances from entering the potable / domestic water system.
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.
Preparing For A Backflow Test Prepare your property for a water supply shut-off. Authorities should also be notified if the shut-off may affect fire fighting devices. Record the water system's initial conditions and specifications, including connections, assemblies, installations, and area-related details.

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