Yes the ring gauge is the right way for the thread depth. Another issue is the thread quality. If the dyes weren't good or properly oiled the thread quality goes down and sometimes causes leaks. We had a similar case and that was the culprit.
Rod at Rapid -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of [email protected] Sent: Wednesday, January 13, 2016 5:16 PM To: [email protected] Subject: RE: Torque values? The proper way to determine a correct joint make up is with a ring gauge to test the thread depth and taper. If the threads are made properly, then the "2 to 3 threads showing at make-up" standard is bullet proof. If the ring gauge indicates the threads are deep or shallow, a "tight " joint may bottom out the threads or leave 4 threads showing. Both conditions can be a long term problem. Start with ring gauges. Mark at Aero 602 820-7894 -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Steve Leyton Sent: Wednesday, January 13, 2016 5:02 PM To: [email protected] Subject: RE: Torque values? Yes, the metallurgist will be doing in depth analysis of the threads, but there are long-standing good practices and standards for threads. SL -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Matthew J Willis Sent: Wednesday, January 13, 2016 4:00 PM To: Forum Subject: RE: Torque values? Have you checked into the thread itself? My old memory recalls the taper and threads per inch. On 1" pipe you have 2 7/8 threads left. AFSA course has good best practices. Sent from my Verizon Wireless 4G LTE smartphone -------- Original message -------- From: Steve Leyton <[email protected]> Date: 01/13/2016 4:54 PM (GMT-07:00) To: [email protected] Subject: Torque values? I have an interesting and challenging situation: My firm is overseeing remediation of rampant leaks on all floors of the sprinkler systems in a 6-story building. Our first suspect was a really bad MIC infection, but that's not it. What we think we have is situation where the threads were not cut correctly or where arm-over and drop piping wasn't correctly made into the T.I. ready shell system branch outlets. The owner has hired a metallurgist to do all sorts of analysis on the piping and one of the things we want to do is torque test some of the samples to determine whether they're made in correctly. But we need a benchmark: I know that there are different training methods for piping installation and that making pipe in 4 or 5 turns by hand and then a certain number of turns by wrench is one of the metrics that has been widely used over the last few years. But we have not been able to ascertain whether or not there's ever been a torque load value established for making in threads. Can anyone help me find publishe d standards of care and practice for threaded piping make-ups in terms of torque or turns? Thanks in advance, Steve Leyton Protection Design & Consulting San Diego, CA _______________________________________________ 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 _______________________________________________ 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 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
