NFPA 13 has contained this in the appendix in varying locations since the dawn of time (or at least since I was 4 years old in 1983):
A dry pipe system should be installed only where heat is not adequate to prevent freezing of water in all parts of, or in sections of, the system. Dry pipe systems should be converted to wet pipe systems when they become unnecessary because adequate heat is provided. Sprinklers should not be shut off in cold weather. While this is murky, FM added their input in the old 2-8N sheet, I found a 1996 edition online, it's basically NFPA 13 with commentary. It states below this section: When a dry-pipe valve is used on a wet-pipe system, the clapper(s)should be removed and attached to the outside of the valve. The connection to the alarm should be removed and the opening plugged. A vane-type alarm should be installed to maintain the alarm service. Might be worth something at least as what used to qualify as "good practice"? Personally, I'd just replace the valve unless I was coming out of pocket/got strong customer pushback. Mike Morey CFPS 3229 • NICET S.E.T. 123677 Project Manager • Fire Protection Group Shambaugh & Son, LP an EMCOR Company 7614 Opportunity Drive • Fort Wayne, IN • 46825 direct 260.487.7824 / cell 260.417.0625 / fax 260.487.7991 email mmo...@shambaugh.com From: John Paulsen via Sprinklerforum <sprinklerforum@lists.firesprinkler.org> To: "sprinklerforum@lists.firesprinkler.org" <sprinklerforum@lists.firesprinkler.org> Cc: John Paulsen <j...@crwnfire.com> Date: 09/24/2019 03:08 PM Subject: FW: Dry Pipe Valve to Wet Sent by: "Sprinklerforum" <sprinklerforum-boun...@lists.firesprinkler.org> BE ADVISED - This email originated outside EMCOR. From: John Paulsen Sent: Tuesday, September 24, 2019 10:06 AM To: Sprinklerforum <sprinklerforum-boun...@lists.firesprinkler.org> Subject: Dry Pipe Valve to Wet Good Day Everyone! A question has come up regarding the practice of taking the clapper out of a dry pipe valve in order to convert the system from dry pipe to wet pipe. We have had local AHJ’s demand that the valve itself be changed to avoid confusion for the first responders, but I was wondering if anyone on the forum knew of a specific code reference that would prohibit removing the clapper and leaving the DPV in place? Thanks in Advance, John Paulsen – SET Sprinkler System Design & Sales Silco Fire and Security 2345 Southwest Blvd. Grove City, OH 43123 P-614-449-2101 Ext. 3367 F-614-449-2007 C-614-348-8206 _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.firesprinkler.org_listinfo.cgi_sprinklerforum-2Dfiresprinkler.org&d=DwICAg&c=GKdB6-XpYq_0W-WluyVHtw&r=z4t2hrRBa-JsS06T4X_uuYOSJoclVWgSRO8Nq6TDdsg&m=oYJFgm7qJe-XThLaNyLKX6seZty57wDNwosPCTICKT4&s=IC2l_dsvHYvTnFLC6EQiHBUzzLYzgOX0jGoDC-k0aXA&e= This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient.
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