Would you happen to have a copy of one of those letters? This is from an installation guide, "The pipe size of the hanger shall be the same size as the supported pipe".
Ryan Peterson Wayne Automatic Fire Sprinklers, Inc. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Top Myers Sent: Thursday, January 03, 2008 4:51 PM To: sprinklerforum@firesprinkler.org Subject: RE: Hanger Size Question The following wording explains the issue. CPVC manufacturers have often written letters allowing upsizing one size on U-strap hangers The process of attaching CPVC fire sprinkler pipe and fittings systems to a structure using certain types of hangers and supports not used to restrain the piping system as required to address specific sprinkler applications/Listings may possibly impart excessive, unacceptable stress upon the pipe. This can lead to cracking of the pipe. For example, excessive bending stress can be placed on the pipe when a hanger is located near a fitting and fastened tightly to the structure. The actual deflection of the pipe should be compared to the values given in the table of "Permissible Bending Deflections of CPVC Pipe with Both Ends Restrained". Always minimize the stress upon the CPVC fire sprinkler system when installing hangers and supports. If, in the example mentioned, the deflection is greater than that specified in the table, the next larger size hanger could be installed to reduce the stress. Top Myers Myers Risk Services 961 Pottstown Pike Chester Springs, PA 19425 [EMAIL PROTECTED] O - 610-321-2415 X-219 C - 610-952-0965 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of scott mitchell Sent: Wednesday, January 02, 2008 10:16 PM To: sprinklerforum@firesprinkler.org Subject: RE: Hanger Size Question Your concern is valid. The 1-1/4" strap is not listed for service on 1" pipe. UL tests the 1-1/4" strap with 1-1/4" pipe, not 1". Scott Mitchell Ryan Peterson <[EMAIL PROTECTED]> wrote: 2002, but 9.1.1.6 governs trapeze and I'm more concerned with general hanger size; such as, hanging 1" pipe with an 1 1/4" 2-hole strap. Ryan Peterson Wayne Automatic Fire Sprinklers, Inc. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Matthew Walsvik Sent: Wednesday, January 02, 2008 11:39 AM To: sprinklerforum@firesprinkler.org Subject: RE: Hanger Size Question Are you using NFPA 13 2002? Or 2007? The requirements of 9.1.1.6 were changed in the 2007 edition. Matthew D. Walsvik, EIT Civil/Fire Protection Engineer Ulteig Engineers, Inc. 3350 38th Ave. S. Fargo, ND 58106/9615 Phone: 701.280.8700 Direct: 701.280.8694 Fax: 701.280.8739 [EMAIL PROTECTED] www.ulteig.com Confidentiality Notice This message may contain privileged and confidential information. If you think, for any reason, this message may have been addressed to you in error, you must not disseminate copy or take any action in reliance on it, and we would ask you to notify me immediately by return email to [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ryan Peterson Sent: Wednesday, January 02, 2008 9:44 AM To: sprinklerforum@firesprinkler.org Subject: Hanger Size Question I thought I read that it was acceptable to install pipe using a hanger one pipe size larger than the pipe being installed but I can't seem to find it. Can someone remind me where I would have read it? Thanks, Ryan Peterson Wayne Automatic Fire Sprinklers, Inc. _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) --------------------------------- Be a better friend, newshound, and know-it-all with Yahoo! Mobile. 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