I seem to recall single thread calculations back in college, however, I could not find anything other than what is in ASME B.1-20-1 (2013) - Pipe threads, General Purpose. Among other things, this standard discusses 'hand-tight engagement', 'wrench makeup length', effective thread length', and their determination. Good luck!
Ryan L. Hinson, PE*, SET** \ Burns & McDonnell Senior Fire Protection Engineer O 612-900-3755 \ M 763-688-4045 \ F 952-229-2923 [email protected] \ burnsmcd.com 8201 Norman Center Drive, Suite 500 \ Minneapolis-St. Paul, MN 55437 *Registered in: AK, LA, MD, MN, PA, TX, & UT **NICET IV - Water-Based Systems Layout -----Original Message----- From: Sprinklerforum <[email protected]> On Behalf Of Kevin Hall via Sprinklerforum Sent: Wednesday, January 5, 2022 8:33 AM To: [email protected] Cc: Kevin Hall <[email protected]> Subject: Re: Thread connection holding on one thread only I do not believe one is sufficient. I recall a project where the specification limited the maximum number of exposed threads to 2 or 3. I'd have to do some research to find the product/installation standard that was referenced. Kevin Hall, M.Eng., P.E., ET, CWBSP, PMSFPE Coordinator, Engineering and Technical Services American Fire Sprinkler Association [email protected] 214-349-5971 On Wed, Jan 5, 2022 at 2:16 AM Dan Arbel via Sprinklerforum < [email protected]> wrote: > Dear Forum Members > > I have a case where 1.25" NPT pipe nipple was connected to 1.25" BSP > (as per British standard) pipe. > > Sprinkler System in interstitial space. > > There was only 2 threads engagement. > > After about 15 years somebody touched the a pipe and the connection > disengaged. > > I would appreciated the members opinion on the allegation that even > one thread engagement is sufficient providing sufficient strength. > > Dan Arbel > Dan Arbel Risk Engineering Ltd > Mail: [email protected] > WEB SITE: > https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.r > iskmanage.com%2F&data=04%7C01%7Crhinson%40burnsmcd.com%7C792ae8f13 > 7ed4f398b2d08d9d0585afc%7Cbfbb9a2b6d994e78b3c795005d555c8b%7C0%7C0%7C6 > 37769900180813465%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoi > V2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=IP3GzldetY9Jtq > R23bhQTjddTl0xMS04V6aSi2LaCyc%3D&reserved=0 > Mobile: +972-52-6611337 > Tel: +972-4-8243337 > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists > .firesprinkler.org%2Flistinfo.cgi%2Fsprinklerforum-firesprinkler.org&a > mp;data=04%7C01%7Crhinson%40burnsmcd.com%7C792ae8f137ed4f398b2d08d9d05 > 85afc%7Cbfbb9a2b6d994e78b3c795005d555c8b%7C0%7C0%7C637769900180813465% > 7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik > 1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=wpDZalLVViOJkPuZW8cUtN5SbS0dbOJh > OYEdnQGwR7s%3D&reserved=0 > _______________________________________________ Sprinklerforum mailing list [email protected] https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.firesprinkler.org%2Flistinfo.cgi%2Fsprinklerforum-firesprinkler.org&data=04%7C01%7Crhinson%40burnsmcd.com%7C792ae8f137ed4f398b2d08d9d0585afc%7Cbfbb9a2b6d994e78b3c795005d555c8b%7C0%7C0%7C637769900180813465%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=wpDZalLVViOJkPuZW8cUtN5SbS0dbOJhOYEdnQGwR7s%3D&reserved=0 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
