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When coming out of a pump room with underground feed which then connects to an underground loop with a bullhead tee, are isolation valves required on the bullhead tee?
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8 Comments
schulman
6/24/2021 08:10:49 am
my experience is that the "loop" has no Isolation valves on it ... the downstream or lead-in supply piping to the various structures fed off of the loop would have isolation valves prior to the supply piping entering each structure .. which of course must be locked out (locked in open position) or monitored by the fire alarm system
Jeremy James
6/24/2021 08:25:37 am
As a contractor, depending on loop size, I would advise installing isolation valves. This will help while installing, as you can pressure test against that valve and then bury that area once it is approved. If you try and test the entire loop and have a leak, good luck searching the entire loop. Unfortunately, I've seen other contractors do this and it's an expensive nightmare. I'm sure there is a code for this also. But where I'm from, plumbers have to do a majority of the UG now.
Glenn Berger
6/24/2021 08:56:06 am
May not be required at the pump discharge to the loop per NFPA 24. But it would be a good location for valves for isolation purposes depending on how many hydrants and other connections provided.
Franck
6/24/2021 12:49:55 pm
Common recommended practice to have isolation valves on a loop system.
Jon Sullivan
6/24/2021 02:07:55 pm
We do this on large steam utility system as well when they are looped and cross-fed. Typically at the up and down stream piping entrances in the building service manhole and on the take off in a manhole. Sometimes you'll see up and down stream of each take off as well. I've also seen separate isolation manholes up and down stream of the building service manhole; that gets expensive.
franck
6/24/2021 12:54:05 pm
One of my common recommendation is the following:
KANG
6/29/2021 06:07:22 pm
Underground loop isolation valves shall be located not to exeed six(6) users of fire protection connection between the valves according to NFPA 24.
Brian K Fain
6/30/2021 08:24:00 am
Thank you for all the input everyone! Leave a Reply. |
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