What is This Spring-Loaded Riser Component?

3/15/2019

Our first Daily question of the day that includes a photo. Here goes -

I was surveying/inspecting a facility and came across a riser component that I am not familiar with, at least in the way this one appears.

The riser room is located in a basement, and the white drain goes to a sump, then is connected to drain pipe. I have never seen this arrangement before.

The question is what is the stainless steel hose going to that says “spring loaded”?

...one of these days I gotta find time to hang out with a sprinkler contractor or FPE….

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4 Comments

Leroy Howell

3/15/2019 10:10:31 am

Hard to see clearly in the image, but to me that looks like the relief valve for a RPZ type backflow device. The stainless hose would be the sensing line. The check valves inside are spring loaded and labeled as such in order to make sure parts don't go flying if you disassemble it.

Franck

3/15/2019 03:54:04 pm

It could be some kind of ‘in house’ pressure relief valve installed downstream the ACV of the sprinkler system.
It is now mandatory per NFPA 13 to provide PRV on sprinkler systems to avoid pressure build up downstream the ACV (waterhammer, high temperature...) but ot wasn’t prior to 2016.
This could be a ‘practical’ solution found to solve this problem, even though it dorsn’t look very reliable (and done the correct way)

Dave L.

3/20/2019 10:41:22 am

I agree with Mr. Howell – Looks like a Zurn/Wilkins 475 RP
https://www.zurn.com/products/water-safety/backflow-prevention/model-475v
(Refer to O&M and repair parts documents.)

Dave L.

3/20/2019 11:44:22 am

https://fccchr.usc.edu/_downloads/Cross%20Talk%20Archives/2008.26.1.pdf

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