Hey Zach, Dry Pendents on return bends installed on dry systems have been a staple for a long time, I think John was noting the allowance of standard pipe return bends to a standard pendent (not dry head) installed and protecting a heated area.
I’ve been curious about the length of time for corrosion or the accelerated corrosion with trapped water in return bends supplying heated areas when installed on dry systems. Anyone else have any anecdotal info or observations on this? I haven’t seen it, but it doesn’t mean it’s not happening… Jamie Seidl SET # 107472 Century Fire Protection<http://www.centuryfp.com/> | General Manager 3600 Woodpark Blvd. Suite G, Charlotte, NC 28206 p 704 888 3473 | m 704 650 0033 <https://www.facebook.com/CenturyFP> [cid:[email protected]] <https://www.linkedin.com/company/century-fire-protection> [cid:[email protected]] <https://www.instagram.com/centuryfp/> From: Zachary Siegrist <[email protected]> Sent: Thursday, October 30, 2025 11:54 AM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]> Subject: [Sprinklerforum] Re: Dry System With Flex Drops External Email: ONLY open links/attachments from known safe sources Related to this, I have a dry system I’m reviewing that features return beds feeding a dry pendant head. My argument is that the environment is not maintained at 40F or above as mentioned in the 2016 edition section 7.2.2. I see water filling the return bend during a three year full trip. His argument is that he is using a listed dry sprinkler. Who is right? Zach On Wed, Oct 29, 2025 at 1:13 PM John Denhardt <[email protected]<mailto:[email protected]>> wrote: While fully allowed, having piping containing water in a dry pipe system most likely will lead to accelerated corrosion of the dry pipe piping system. Thanks, John John August Denhardt, P.E Vice President Engineering and Technical Services American Fire Sprinkler Association 301-343-1457 Are you a member with a technical question? Don't forget one of the most valuable resources that AFSA provides is Technical Reviews by our Technical Services Department. It’s like having an FPE on your staff. Visit www.firesprinkler.org/technicalreview<https://www.firesprinkler.org/technicalreview> to submit a question today! (Member login required.) On Oct 29, 2025, at 12:59, Taylor Schumacher <[email protected]<mailto:[email protected]>> wrote: _________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to [email protected]<mailto:[email protected]> I have a dry system that is feeding upright sprinklers on sprigs in a heated light hazard space. The owner wants to add ACT. I’m wondering if I can use flex drops into the ACT. Feels weird, but I cannot find any reason why I shouldn’t. Taylor Schumacher _________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to [email protected]<mailto:[email protected]>
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