MeyerFire
  • Blog
  • Forum
  • PE Exam
    • PE Forum & Errata
    • PE Problems
    • PE Store
    • PE Tools
    • PE Prep Series
  • TOOLS
    • TOOLKIT (FREE TRIAL)
    • *TOOLKIT (PURCHASE)
    • SUBMIT AN IDEA
    • BACKFLOW DATABASE*
    • CLEAN AGENT ESTIMATOR
    • CLOUD CEILING CALCULATOR
    • DOMESTIC DEMAND
    • FIRE PUMP ANALYZER
    • FIRE PUMP DATABASE*
    • FIRE FLOW CALCULATOR*
    • FRICTION LOSS CALCULATOR
    • HANGER SPACER
    • IBC TRANSLATOR*
    • K-FACTOR SELECTOR
    • NFPA 13 EDITION TRANSLATOR ('19 ONLY)
    • NFPA 13 EDITION TRANSLATOR ('99-'19)*
    • LIQUIDS ANALYZER*
    • OBSTRUCTION CALCULATOR
    • OBSTRUCTIONS AGAINST WALL*
    • PLUMBING FIXTURE COUNTS
    • REMOTE AREA ANALYZER
    • QUICK RESPONSE AREA REDUCTION
    • SPRINKLER DATABASE*
    • SPRINKLER FLOW*
    • TEST & DRAIN CALCULATOR
    • THRUST BLOCK CALCULATOR
    • TRAPEZE CALCULATOR
    • UNIT CONVERTER
    • VOLUME & COMPRESSOR CALCULATOR
    • WATER SUPPLY (US)
    • WATER SUPPLY (METRIC)
  • TOOLKIT
  • LOGIN
  • STORE
  • About
Picture
ALL THINGS FIRE PROTECTION | SUBSCRIBE NOW

Riser with 3" PRV Upstream of Zone Control?

3/5/2020

14 Comments

 
During a hotel stay in NYC over the weekend I noticed the combination standpipe included a 3" pressure reducing valve just upstream of the 3" zone control assembly.

An indicating valve was not installed on the inlet side of the Cla-Val (model 90G-21 with no pressure gauges). A filler piece between the PRV outlet and the butterfly valve included a pressure gauge which was at 60 psi. The 2-1/2" fire hose valve was standard pressure and the express drain was only 2".

This arrangement is not something I would expect to see in the DC metro area, but is it typical of NYC?

​​​​​​​​Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe
14 Comments
Casey Milhorn
3/5/2020 10:53:38 am

Following

Reply
Greg Stoner
3/10/2020 01:52:55 pm

Here are the photos.

https://photos.app.goo.gl/XoFn5GVVC4XBefLD9

Reply
Bobby Suarez
3/5/2020 12:08:26 pm

Can you link a photo ?

Reply
Greg Stoner
3/10/2020 01:53:25 pm

Photos:

https://photos.app.goo.gl/XoFn5GVVC4XBefLD9

Reply
Anthony
3/5/2020 12:11:50 pm

For several years I inspected a number of Hotels around the Times Square area. Very common. Just saying
I guess the powers to be got annoyed at my incessant complaining and didn't renew my Contract. Oh well.

Reply
sean
3/5/2020 03:05:57 pm

at first read it does not sound compliant.

Reply
Matthew King
3/5/2020 03:08:12 pm

There are some usual configurations allowed as round risers and PIVs. If you have the handbook versions of NFPA 14 and 24, the editorial notes make very clear that while they are permissible, they are frowned upon, bit as remnants of past legitimate design and construction, they remain in code, subject to certain adminstrative provisions. I am speaking in general having encountered a few cases that sound reminiscent of your description. I do not understand your written description to sufficient detail comment on it specifically. Note: locks, locked compartments and periodic physical inspections seem to be key to acceptability in all the cases I am familiar with being acceptable.

Reply
Vinny Boves link
3/6/2020 06:20:19 am

A photo would have been nice.

Reply
Greg S
3/6/2020 08:41:17 am

Sorry I didn't post a photo because I didn't see how to include it when posting the question.

Reply
Bobby Suarez
3/6/2020 07:36:46 pm

https://photos.app.goo.gl/iw2aYBYhsG3HQLhW6

Reply
Bobby Suarez
3/6/2020 07:42:01 pm

You can upload the photo to a photo/file sharing website and then share the link in a comment here like I did using Google Photos above.

Reply
Bobby
3/6/2020 08:16:52 pm

NFPA 13, and UL both require a pressure gauge before and after each PRV and thats exactly how Cla-val sells it. The gauges are integrated onto the 90G pilot prv by cla-val and dont require additional gauges aside from the integrated ones. You have me scratching my head on your description of the indicating valve location because it should be upstream of the PRV or else the PRV cannot be serviced without draining the entire riser. That would be foolish of the installer. Was the standard hose valve also downstream of the pilot prv or was it on the riser?

Reply
Greg Stoner
3/9/2020 12:07:00 pm

Here is a link to the photos of the PRV zone control:

https://photos.app.goo.gl/XoFn5GVVC4XBefLD9

Reply
Naveen Kumar
3/16/2020 12:35:10 am

Hi, In DC region, if the pressure cross 180 PSI, need PRV to reduce pressure downstream of zone valve assembly to serve sprinkler zones.

Reply



Leave a Reply.

    Jump to: Daily Posts
    Jump to: PE Problems
    Picture
    Why Sponsor?

    Free Signup

    Subscribe and learn something new each day:
    I'm Interested In:

    Community

    Thank You to Our Top
    ​February '21 Contributors!
    1. Dan W.
    2. Franck
    3. Jesse
    4. CJ B.
    ​5. Brian G.
    6. Mike
    7. Matt
    8. Casey M.
    9. Jay R.
    10. Glenn B.

    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:
    Picture
    FREE 30-DAY TRIAL
    GET THE TOOLKIT

    Filters

    All
    ABA
    ADA
    ASCE 7
    ASME A17.1
    Daily Discussion
    Design Documents
    Explosion Protection & Prevention
    Fire Detection And Alarm Systems
    Fire Dynamics
    Flammable & Combustible LIquids
    FM Global
    Human Behavior
    IBC
    IFC
    Information Sources For Analysis
    IRC
    Means Of Egress
    NFPA 1
    NFPA 10
    NFPA 101
    NFPA 11
    NFPA 110
    NFPA 12
    NFPA 13
    NFPA 13D
    NFPA 13R
    NFPA 14
    NFPA 15
    NFPA 17A
    NFPA 20
    NFPA 2001
    NFPA 214
    NFPA 22
    NFPA 24
    NFPA 25
    NFPA 291
    NFPA 30
    NFPA 33
    NFPA 400
    NFPA 415
    NFPA 497
    NFPA 5000
    NFPA 502
    NFPA 54
    NFPA 55
    NFPA 654
    NFPA 68
    NFPA 70
    NFPA 72
    NFPA 92
    NICET
    Passive Building Systems
    PE Prep Guide
    PE Prep Series
    PE Sample Problems
    Poll
    Smoke Management Systems
    Special Hazard Systems
    Types Of Analysis
    UFC 3 600 01
    UFC 3-600-01
    Updates
    Water Based Fire Suppression
    Weekly Exams


    Archives

    March 2021
    February 2021
    January 2021
    December 2020
    November 2020
    October 2020
    September 2020
    August 2020
    July 2020
    June 2020
    May 2020
    April 2020
    March 2020
    February 2020
    January 2020
    December 2019
    November 2019
    October 2019
    September 2019
    August 2019
    July 2019
    June 2019
    May 2019
    April 2019
    March 2019
    February 2019
    January 2019
    December 2018
    November 2018
    October 2018
    September 2018
    August 2018
    July 2018
    June 2018
    May 2018
    November 2017
    October 2017
    September 2017
    August 2017
    July 2017
    June 2017
    November 2016
    October 2016
    July 2016
    June 2016


    Daily
    Daily discussions are open-ended fire protection, fire alarm, and life safety questions submitted anonymously for the benefit of sharing expertise and learning from other perspectives. Anyone can submit a question here:
    SUBMIT A QUESTION

    Exam Prep

    Picture
    2020 PE Prep Guide​
    ​(Available Now!)
    Picture
    PE Prep Series
    ​(Available Now!)
    2020 PE Prep Series
    Current Leaderboard
    ​(Click to enlarge)
    Fire Protection PE Exam Prep

    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

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

​Copyright © 2021 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.
  • Blog
  • Forum
  • PE Exam
    • PE Forum & Errata
    • PE Problems
    • PE Store
    • PE Tools
    • PE Prep Series
  • TOOLS
    • TOOLKIT (FREE TRIAL)
    • *TOOLKIT (PURCHASE)
    • SUBMIT AN IDEA
    • BACKFLOW DATABASE*
    • CLEAN AGENT ESTIMATOR
    • CLOUD CEILING CALCULATOR
    • DOMESTIC DEMAND
    • FIRE PUMP ANALYZER
    • FIRE PUMP DATABASE*
    • FIRE FLOW CALCULATOR*
    • FRICTION LOSS CALCULATOR
    • HANGER SPACER
    • IBC TRANSLATOR*
    • K-FACTOR SELECTOR
    • NFPA 13 EDITION TRANSLATOR ('19 ONLY)
    • NFPA 13 EDITION TRANSLATOR ('99-'19)*
    • LIQUIDS ANALYZER*
    • OBSTRUCTION CALCULATOR
    • OBSTRUCTIONS AGAINST WALL*
    • PLUMBING FIXTURE COUNTS
    • REMOTE AREA ANALYZER
    • QUICK RESPONSE AREA REDUCTION
    • SPRINKLER DATABASE*
    • SPRINKLER FLOW*
    • TEST & DRAIN CALCULATOR
    • THRUST BLOCK CALCULATOR
    • TRAPEZE CALCULATOR
    • UNIT CONVERTER
    • VOLUME & COMPRESSOR CALCULATOR
    • WATER SUPPLY (US)
    • WATER SUPPLY (METRIC)
  • TOOLKIT
  • LOGIN
  • STORE
  • About