Sprinkler water main gage and back flow preventor

[cdafd]

If you have a back flow preventor as part of the sprinkler riser stack.

Where should the gage be for the city water main pressure coming into the system??

Before the back flow preventor??

or


After the back flow preventor?

 

[PEDARRIN2]

Why not both locations?

 

[cdafd]

Ped


Do not have the book in front of me but says something like one prior to an alarm or check valve and one on the system side.

Question is more if a backflow is on the riser,,,,, do you need a gage at the bottom of the backflow for the city main/ supply coming into the system

 

[TravisMack]

Put a gauge on one of the bfp ports that is on the supply side of the #1 check. Put a second somewhere on the system side of the #2 check.

Travis Mack
MFP Design, LLC

http://www.mfpdesign.com