Where does the requirement for a post-indicating valve originate? If I only have a sprinkler system, is a post-indicating valve required?
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12/13/2018 06:32:54 am
My understanding is PIVs are needed based on NFPA 13 22.214.171.124.1.2 - at least one indicating valve is required in each source of supply. If for some reason you can't put a control valve on your supply line inside the building, you can use a PIV instead.
12/13/2018 11:12:48 am
What is the purpose of having a PIV at 40 ft (12 m) ? If you unferstand the « why » behind, you will better understand the purpose.
9/18/2019 01:50:54 pm
It has to be outside of the Collapsible zone of the building which 40'
12/13/2018 11:44:16 am
It would be good if ANY Civil Engineering types could chime in in this one. ZS, do you mean a PIV as the only means? I am assuming you mean in addition to other indicating control valve(s) inside. In which case, correct me if I’m wrong, but as far as a PIV requirement, I think NFPA 24 used to require a yard PIV (unless the AHJ said otherwise) up through the 2007 edition. But that section (Chapter 6) has since changed. (I think it now only says what to do IF you have one.) With most AHJ,’s their municipal codes are available and searchable on-line, that is where I look for requirements on a case-by-case basis. Around here, some require PIV’s, others do not, and some require it if there is no outside access to the riser room. In some situations wall P.I. is an option, but as Franck says, building collapse zones sometimes factor in. I also check the public works/water purveyor standard details. And my notes from previous jobs. But when in doubt, for me it often comes down to a phone call or email to the AHJ, then document that communication. Similar applies to FDC location requirements.
1/4/2019 10:00:57 am
One very important reason was left out in this thread. Codes like these were adopted,usually because of an incident that occurred and there was loss of life, property or severe injuries.
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