Riser with 3" PRV Upstream of Zone Control?

3/5/2020

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?

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14 Comments

Casey Milhorn

3/5/2020 10:53:38 am

Following

Greg Stoner

3/10/2020 01:52:55 pm

Here are the photos.

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

Bobby Suarez

3/5/2020 12:08:26 pm

Can you link a photo ?

Greg Stoner

3/10/2020 01:53:25 pm

Photos:

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

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.

sean

3/5/2020 03:05:57 pm

at first read it does not sound compliant.

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.

Vinny Boves link

3/6/2020 06:20:19 am

A photo would have been nice.

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.

Bobby Suarez

3/6/2020 07:36:46 pm

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

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.

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?

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

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.

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