This isn't a specific answer but, in general, you can definitely restrain with either mechanical restraints or thrust blocks or both. As for compatibility of restraint products with different types of pipe and fittings, consult the manufacturer for tech support if necessary. As for compatibility of different pipe types with different types of MJ and push-on fittings, I've seen transition rubbers, adaptive fittings, all manner of interconnection over the years. So long as the uni-flanges and glands and restraints, etc., etc. are all carefully applied to the situation, i.e. pipe and fitting types, and so long as all that hardware is installed per the manufacturers' guidelines, nothing in your narrative seems undo-able or a bad practice, at least not after a quick read.
But keep in mind that you're talking about a lot of ferrous goodies in these connections, which is one thing that thrust blocking displaces. I'd want to see a proactive and aggressive effort to mitigate corrosion, i.e. coating the hardware, encasing in seamless PE sleeves, etc. Steve L. -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Aaron Peck Sent: Wednesday, December 24, 2014 5:21 AM To: [email protected] Subject: Underground Restraint I'm on a project where the underground isn't clear, I mean I'm used to restrained megalugs and fittings where thrust blocks are not used. Now this project is using just bell and spigot C900 (DR18) with push on fittings that will have thrust blocks. With lined DI52 with flanges to connect to C900 pipe with PVC uni-flanges. I can't seem to find anything conclusive in NFPA 24. 1) Can DR-18 pipe just be installed without the use bell joint restraint because of using thrust blocks? 2) Can you connect lined DI52 fabricated with a flange directly to C900 via a PVC uni-flange? 3) They are also planning on connecting to the PIV NRS valve with the uni-flange. 4) It appears you can use C900 restrainers with push on fittings but only have serrated so I'm assuming we could use those as bell restrainers. Another thing and I can't find a code to back it is the use of DR14 pipe for the FDC line. The ordered all DR18, long time before I got here, and the plans/specifications doesn't mention it. Is it code or just local regulations that I'm confusing it with? Thanks! _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler .org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
