NFPA 25 Sprinkler Backflow Preventer Inspection - SimplexGrinnell Philadelphia

[@Thomasz126]

Is the backflow preventer typically located between 2 control valves on fire suspression systems?

[@rodneykough601]

The control valves are actually part of the listed device

[@fitter5426]

No back pressure???? No testing if the #2 shut off is holding????

[@scottradcliffe4384]

Wow...just wow. Check out USC 10th edition and do it correctly.

[@jamesholeva4496]

The differential pressure across the check valve can be accomplished correctly by connecting the high pressure hose to test cock number 2 and the low pressure hose to test cock number 3. This is a recognized and accepted method of measuring differential pressure. Read the manual!

[@fitter5423]

Union guys don’t use the USC 10th edition buddy. We’re trained on the ASSE method which is what he did. It’s an acceptable way to test the differential pressures.

[@tomcat6641]

that why sixplex grinnell are losing their contracts for ispections and services.They charge too much for doing things the wrong way.

[@macsrule94]

They have been known to fail back flows in Charlotte NC area and they don't offer repairs, only replacement. They like to do it on the smaller devices (Irrigation, Domestic, bypass devices). One customer we went to and tested the device after Simplex and it passed with no issues, they had forgotten to close the #2 on an RPZ and there was watering flowing thru the device so it caused the Relief not to dump. Another one had the little bypass on a RPDA fail and they told them they had to replace the entire 8" device (think big $$$ for them), there was nothing wrong with the large 8" one, just had to replace the little 3/4" bypass device.

[@jamesholeva4496]

They measured the differential pressure across the check valves correctly.

[@fitter5423]

First of all do some research, look at the cost to replace the check in backflows 1” and smaller. For the cost of material and labor to rebuild and retest is a few dollars less than to replace the whole device. It’s common sense.

[@EnforcementDronEd209]

This tech needs to go back to school! On DCDA USE ONE HOSE ONLY READ YOUR MANUEL.. ANOTHER JOKE VIDEO!

[@jamesholeva4496]

The manuals AWWA M14 and ASSE both discuss how to measure the differential pressure across the check valve by measuring the water pressure on each side of the check valve. Acceptable procedure NO JOKE --- Read manuals.