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….

Posted anonymously by a member for discussion. Discuss this | Submit a Question | Subscribe

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

Free Signup

Subscribe and learn something new each day:

Community

Thank You to Our Top
August 2020 Contributors!

1. SK
2. Near Engineer
3. NinaB
4. Brenton
5. Mike

6. Sean
7. Dan Wilder
8. Tim D.
9. Rob B.
10. Jonathan

Your Post

SUBMIT A QUESTION

The Toolkit

Sprinkler Designer or Engineer?

Get all of our tools, including the Sprinkler Database, Friction Loss Calculator, Fire Pump Analyzer and more:

FREE 30-DAY TRIAL

GET THE TOOLKIT

Filters

Exam Prep

2020 PE Prep Guide
(Available Now!)

PE Prep Series
(Available Now!)

2020 PE Prep Series
Current Leaderboard
(Click to enlarge)

PE Problems

Visit July-October for daily Fire Protection PE Exam sample questions.

Solutions are posted the day after posting.

Comment with your solutions, questions or clarifications.

Please note that questions posted are unofficial and in accordance with NCEES rules are intended to be similar to actual exam questions, not actual exam questions themselves.

RSS Feed

Home - About - Blog - Contact - Exam Prep - Store

Copyright © 2020 MeyerFire, LLC
The views, opinions, and information found on this site represent solely the author shown and do not represent the opinions of any other party, nor does the presented material assume responsibility for its use. Fire protection and life safety systems constitute a critical component for public health and safety and you should consult with a licensed professional for proper design and code adherence. Some (not all) outbound links on this website, such as Amazon links, are affiliate-based where we receive a commission for orders placed elsewhere.