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Improper Startup of a Backflow Assembly

December 1, 2018

Manufactures provide pressurization startup procedures for newly installed or repaired backflow prevention assemblies. Failure to read the instructions provided by the manufacturer can result in problems like the one you see here.

As you can see in the 1st photo check valve number 1 is jammed open. This is caused when a contractor does not follow procedure. They opened shut off valve number 2 first and then they opened shut off valve number 1 way too fast.

Typical startup procedures are as follows: With both shut off valves in the closed position, 1st slowly open shut off valve #1, use the test Cocks to bleed the air out of the assembly, then simply slowly open shut off valve #2.

Wilkins 350 Pic1

The picture below shows how the check valve should look in a no flow static condition.

Wilkins 350 Pic2

What Jar Opener?

July 2, 2018

Everybody’s been asking me what jar opener? So I decided to throw a couple of pictures up to clear the air. The dark green section is of a soft rubbery compound which will not damage your check module or O ring, yet with little pressure the module will not slip.

jar-opener-2-21.jpgJar Opener 2 (1)

 

Jar Opener 2 (2)

1.25”- 3” Watts 009 Series Check Module Disassembly and Reassembly Tool.

June 30, 2018

Experience has taught me that rubber kits are a waste of time and money when repairing module type check valves with plastic seats. The assembly may pass after the installation of a rubber kit, but it rarely brings the assembly back up to factory specifications that are shown on the manufacturers flowchart. For this reason 98% of the time I replace the entire module. However there are times when there’s absolutely nothing wrong with the module except for it needing a cleaning and a thorough inspection, this is where this simple homemade tool comes in handy.

I’m only in my 50s but I rarely have been able to get the 1.25” and larger 009 #1 check module apart, and when I have I was not able to get it back together. So I used  items around the house to make a tool that makes this a simple process that I will be able to do when I’m in my 70s.

Watts 009 #1Watts 009 #2Watts 009 #3 (2)Watts 009 #4 (1)It’s simply a socket taped to a clamp.

Just put a couple drops of food grade lubricant on the area of the cage that the seat locks into and use a jar opener to twist and lock the seat into place. You can quickly clean and inspect the seat, poppet, disc, etc.

Remember a proper repair will bring the assembly up to factory specifications. If your repair only makes the assembly barely pass the minimum guidelines it is not a proper repair and you should rebuild it again until you get it right. Every now and again you’re going to get an assembly that’s going to kick your butt. Just stay calm and stick with it and through perseverance you will get it right.

 

The 1st Step to Backflow Assembly Repair

January 28, 2018

Before a backflow assembly can be repaired to factory specifications the technician must refer to the manufactures supplied flowchart. The flowchart tells us what the factory specification “PSID” should be for each check valve.

For instance if you repair the check valve in a DCVA and you get a reading of 1.1 PSID after your repair but the flowchart indicates the PSID for the check valve should be 2.6 PSID then you have not properly repaired the assembly.

Deringer 20 DCDeringer 40RP1

It’s also important to note the only time you should check “LEAKS” on your test report for a DCVA is if you’re gauge PSID reading is “0.0”. If your gauge reads 0.1 PSID the check valve is still holding “TIGHT” and you should check the “TIGHT” box and record your findings.

“LEAKS” should only be checked when you get a 0.0 PSID reading. All other readings should be marked “TIGHT” for DCVA’s / DCDA’s, PVBA’s & SVBA’s. “LEAKS” should only be used on RPBA’s if after your testing / diagnostics you discover one of the check valves are failing causing the relief valve to vent.

In Honor of a Dear Friend, Brother, and Colleague; Steve Nelson of Veteran Backflow Service

January 27, 2018

 

Beloved son, brother, uncle, and friend, Stephen Trent Nelson entered into rest on December 30, 2017 after a prolonged illness from cancer. Stephen was the first son born to Major Clayton Jack and Mary Mae Reynolds Nelson on May 20, 1951 in Munich, Germany. As a young child, he lived in Newfoundland and Illinois, and later settled with his family in the Lake City suburb of Tacoma, WA. Steve graduated from Lakes High School in 1969.

Steve Nelson

At age 19, Stephen joined the U.S. Army and was soon deployed to Vietnam where he served October 5, 1970 to December 4, 1971. During his time there, Steve was a journalist assigned to the Delta Dragons, Military Assistance Command Vietnam (MACV) Team 96 in Can Tho, Mekong Delta. He rode helicopters all over South Vietnam to investigate stories and wrote articles published in his unit’s newspaper as well as the Stars and Stripes. He was proud and honored to have served his country, like his father and uncles before him.

Although he was a lifelong resident of Washington, Steve traveled throughout the United States upon his honorable discharge in the ‘70s. He hitchhiked cross-country twice, with extended stays in South Carolina and Florida.

Veteran Backflow Service1 (1)Veteran Backflow Service1 (2)

For the past several decades, Stephen was the property superintendent for companies in Seattle, Everett, SeaTac and Burien. Since 2011, Steve ran his own successful business, Veteran Backflow Services. He truly loved this job and the camaraderie he found with other entrepreneurs in the industry.

Steve was an avid sports fan, rooting for the Mariners, the Seahawks, the Packers, and the Sonics. He also loved music of all kinds, especially the Beatles. A voracious reader, his home was filled with books of all genres. He had an eye for art, a green thumb, and a loving heart. Stephen will be missed for his many kindnesses, quick smile, and true compassion for others.

What causes a relief valve to open up early? “5.0 PSID or above”

January 17, 2018

Relief valve opening early

Technically when a relief valves opening point is above 5.0 PSID it is considered a failure and the relief valve should be repaired.

The relief valve is a resilient soft seated design. In the example photo above, the relief valve disc is mounted in the relief valve assembly so it is flush to the hard plastic outer ring. This hard plastic outer ring is designed to seat on the outer flat edge of the relief valve seat, there by the raised inside sharp edge of the seat only penetrates into the soft resilient disc material specified by engineering specifications. “If the relief valve on the assembly you’re testing opens up early it is because the relief valve is not seating 100% per specifications on the relief valve seat.”

For example if the relief valve seat is supposed to penetrate the relief valve disc by 30% but the relief valve seat is only partially penetrating the disc by 5%, the movement the relief valve must move before the relief valve begins to vent water is reduced by 25%, i.e. the relief valve opening early or at an excessively high PSID.

In short, regardless of the design; if your relief valve is opening above 5.0 PSID then it is safe to assume that your relief valve is not seating 100% and therefore is not working properly. To avoid property damage and a possible emergency repair this should be addressed at the time of service.

Avoid Emergency Shutdowns due to Plugged Sensing Lines

January 2, 2018

The sensing lines on older model 2.5” and larger RPBA’s used on high demand systems and buildings are prone to plug. Modern assemblies have a modified bulkhead design which has proven to reduce the likelihood of a plugged sensing line by keeping the water inlet for the sensing line out of the area where high velocity turbulent water is present. There are many buildings which do not have a bypass assembly on the domestic water line which means when you do a temporary shutdown to test the RPBA you may find yourself in an extended shut down with an emergency repair on your plate.Watts 909There is a way to find out whether you have a plugged sensing line or a defective relief valve without causing panic for your customer and their tenants. I do this method any time I work with an older assembly on a building with no bypass. Once I have determined the sensing line is not plugged I will restart the test using the USC method. If I find the sensing line is plugged I will contact the building engineer and we will schedule a calm and peaceful extended shut down on our terms rather than an emergency basis.

  1. Open TC#4, TC #3, LEAVE TC #2 CLOSED, Open and Close TC #1, Close TC #3, Then TC #4. “DO NOT TOUCH TEST COCK #2”
  2. Connect your High side hose to TC #1
  3. Connect your Low side hose to TC #3
  4. Follow USC testing procedures to get your Relief Valve opening point.
  5. If the relief valve does open, restart your test from the beginning using USC test procedures and note you exercised the relief valve on your test report. Be sure and to thoroughly flush TC #2.
  6. IF THE RELIEF VALVE DOES NOT OPEN, CLOSE ALL TEST COCKS AND RESTORE SERVICE. Contact the customer and let them know the assembly has a plugged sensing line and or a defective relief valve that will require attention and an extended shut down before the assembly can be properly tested.
  7. It’s very important to get this repaired ASAP. I usually repair them while I’m at the building but the customer always appreciates being able to have time to let all the tenants know in advance that they will be without water while the repairs are being made.