If you already know that check valve number 2 is holding tight why do you have to check by how much that spring reduces pressure? Thanks for the answer.
The short answer is because some jurisdictions having authority require the differential test on check valve #2. Beyond that, won’t check valve #2 hold in reverse flow even with a 0.1 psid differential? The answer is yes. This shouldn’t affect the RP’s ability to prevent backflow - but for how long? A 0.1 psid reading is indicating that something is wrong with the check valve and it should be resolved. A complete test including CV2 differential is essential in ensuring that the RP is doing what it is designed and intended to do - which is to protect the public health. Great question! Thank you -
@@vikingiibackflowtraining9608 Here in Tennessee the requirements are: relief valve opens at 2 PSI differential or above. #1 check valve pressure differential is at least 3 PSI above the relief valve opening. #2 check valve pressure differential is at least 1.0 PSI.
With the high side on the #2 test cock and the low side of the kit connected to the #3 test cock, the only thing that the gauge is "seeing" is the differential across the #1 check. The manifold allows the tested to manipulate the differential to see how the assembly reacts. The final test, "the actual differential across the #1 check" is a reading that shows the differential with all displacement of the #2 check being compensated for with the backpressure applied through the vent or bypass of the gauge, through the manifold.
The procedures are based on a combination of USC's 10th Edition test procedures, our local jurisdictional authority's standard, and common sense. Thank you for watching and for commenting.
A simple web page can be very effective. Your potential clients will probably do a Google search for "backflow testing services" when the need arises. Creating web pages have become much easier now than they used to be and much of the web editing software is free for basic web page creation. Beyond that, check and see if your jurisdiction having authority has a list of certified testers available to the public that you can be on. Call some of your local plumbing, irrigation, and fire sprinkler contractors and offer your testing services for their new backflow installations. Many companies have qualified installers but no certified backflow testers surprisingly. They have to sub out the backflow test to somebody like you. Also try property management companies. Some have many properties which means many backflow preventers to test. I hope some of this is helpful and as always, check with your local JHA to be sure you have all of the credentials they require and if they have any additional specific certifications for this kind of work. Thanks for the question.
Thanks for the question Dennis. The 10th edition USC manual requires the flushing sequence to begin by opening all test ports in reverse direction of flow (#4 first, #3, #2, #1) and then closing them in direction of flow (#1 first, #2, #3, #4).
The purpose of using the bypass hose is to determine if check valve #2 is holding tightly in a reverse flow condition. After all, in a reverse flow condition check valve #2 sees all the action. But to answer your question - sure you can do this test without the bypass hose but you will only be able to perform a differential test on check valve #1, the relief valve opening point, and differential test across check valve #2. Perhaps this might be acceptable in your jurisdiction but check with them first. Let me know if you need further clarification. Thanks for watching.
If you already know that check valve number 2 is holding tight why do you have to check by how much that spring reduces pressure? Thanks for the answer.
The short answer is because some jurisdictions having authority require the differential test on check valve #2.
Beyond that, won’t check valve #2 hold in reverse flow even with a 0.1 psid differential? The answer is yes. This shouldn’t affect the RP’s ability to prevent backflow - but for how long? A 0.1 psid reading is indicating that something is wrong with the check valve and it should be resolved. A complete test including CV2 differential is essential in ensuring that the RP is doing what it is designed and intended to do - which is to protect the public health. Great question! Thank you -
@@vikingiibackflowtraining9608 Here in Tennessee the requirements are: relief valve opens at 2 PSI differential or above. #1 check valve pressure differential is at least 3 PSI above the relief valve opening. #2 check valve pressure differential is at least 1.0 PSI.
With the high side on the #2 test cock and the low side of the kit connected to the #3 test cock, the only thing that the gauge is "seeing" is the differential across the #1 check. The manifold allows the tested to manipulate the differential to see how the assembly reacts. The final test, "the actual differential across the #1 check" is a reading that shows the differential with all displacement of the #2 check being compensated for with the backpressure applied through the vent or bypass of the gauge, through the manifold.
Thanks for the video, are these tests done under asse guidelines?
The procedures are based on a combination of USC's 10th Edition test procedures, our local jurisdictional authority's standard, and common sense. Thank you for watching and for commenting.
Hello, I just started my backflow company, how don you recommend finding backflows to certify?
A simple web page can be very effective. Your potential clients will probably do a Google search for "backflow testing services" when the need arises. Creating web pages have become much easier now than they used to be and much of the web editing software is free for basic web page creation. Beyond that, check and see if your jurisdiction having authority has a list of certified testers available to the public that you can be on. Call some of your local plumbing, irrigation, and fire sprinkler contractors and offer your testing services for their new backflow installations. Many companies have qualified installers but no certified backflow testers surprisingly. They have to sub out the backflow test to somebody like you. Also try property management companies. Some have many properties which means many backflow preventers to test. I hope some of this is helpful and as always, check with your local JHA to be sure you have all of the credentials they require and if they have any additional specific certifications for this kind of work. Thanks for the question.
@@vikingiibackflowtraining9608 thank you very much !
I thought you had to do clean #4 first and leave it on then do the others and shut off 4 last
Thanks for the question Dennis. The 10th edition USC manual requires the flushing sequence to begin by opening all test ports in reverse direction of flow (#4 first, #3, #2, #1) and then closing them in direction of flow (#1 first, #2, #3, #4).
Dennis,this is what he did
what are we mimes? thanks for explanation bro!
Can you do this test without using the bypass hose?
The purpose of using the bypass hose is to determine if check valve #2 is holding tightly in a reverse flow condition. After all, in a reverse flow condition check valve #2 sees all the action. But to answer your question - sure you can do this test without the bypass hose but you will only be able to perform a differential test on check valve #1, the relief valve opening point, and differential test across check valve #2. Perhaps this might be acceptable in your jurisdiction but check with them first. Let me know if you need further clarification. Thanks for watching.