Gerzayn, You are correct. Listed mechanical restraint can be used in lieu of thrust bocks. The whole point of both methods is to prevent separation of the pipe joints due to internal and/or thrust forces. Some may choose to use both in situations where they want the added security (maybe access to the pipe will be extremely difficult after the project is completed - or whatever), but as Mr. Steve said, they are not both required.
I don't have a spreadsheet, but I believe the annex of NFPA 24 provides guidance on thrust block sizing. Mark A. Sornsin, P.E. | Karges-Faulconbridge, Inc. | Fire Protection Engineer | Fargo, ND | direct: 701.552.9905 | mobile: 701.371.5759 | http://www.kfiengineers.com -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Gerzayn Fuentes @ CEPI.MX Sent: Thursday, July 16, 2015 12:47 PM To: [email protected] Subject: Thrust block vs Restrainers - Underground Hello, folks! I am working with underground pipe PVC DR14 C900 for a fire sprinkler system and I do understand that if we use restrainers (for example: SIGMA PV-LOK-PVM and PVP) in/near the MJ fittings, we do not need to use thrust blocks. ¿Is this true? I would appreciate if someone could share an Excel file to calculate the thrust block size. Thanks Best regards! _______________________ Gerzayn Fuentes CEPI - Mexico T. + 52 (81) 1766-0800 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com ______________________________________________________________________ _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
