Good information, do you have any forensic statistics on these failures that would give an indication of the cause of the failure? Improper installation, rust/corrosion, produce defect? Mark at Aero 602 820-7894
From: Sprinklerforum [mailto:[email protected]] On Behalf Of Top Myers Sent: Friday, December 16, 2016 11:44 AM To: [email protected] Subject: RE: Use of Set Screw Type Restraint Fire Pump Suction and Discharge Over the years, we have had a number of Uniflange claims. Same with some of their competitors which are import. The rating of 25,000 is based on perfect conditions and when installed in front of system with water flow upstream the water often runs for a long time before noticed. I support Dan Arnolds observation. Top Myers Myers Risk Services 2102 Kimberton Road, Unit 741 Kimberton, PA 19442 (484) 924-8155 Cell 610-952-0965 [email protected]<mailto:[email protected]> Providing Solutions For Your Risk Management Needs From: Sprinklerforum [mailto:[email protected]] On Behalf Of Daniel Arnold Sent: Friday, December 16, 2016 11:48 AM To: [email protected]<mailto:[email protected]> Subject: RE: Use of Set Screw Type Restraint Fire Pump Suction and Discharge Bill: I have seen separations of these style flanges in situations as you describe and others. Personally, I do not spec/use them without rods but there are many, many out there. (Did not sign my prior post.... Apologies,) Dan Arnold Seneca Fire Engineering, LLC On Dec 16, 2016, at 8:30 AM, "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> wrote: Hi Bill, If you look up the technical data sheet on a "Uniflange" you'll find that this device has a rated holding strength in the 25,000 pound range based on the pipe diameter. They are commonly used out here in the Wild West. We have never seen a failure on a properly installed device. Mark at Aero 602 820-7894 Sent from my iPhone On Dec 16, 2016, at 6:20 AM, Bill Brooks <[email protected]<mailto:[email protected]>> wrote: A case came up today about the use of a "mechanical joint wedge action restraint" on the suction and discharge side of a diesel driven pump. Someone accepted a change and eliminated the rods, then put a MJWAC at the top of the ductile pipe on each side of the pump. A commissioning agent has refused to start the pump based on the concern the restraint will "wiggle" off the end of the ductile under repeated pump operation either during the acceptance test or sometime later. Is this a creative use of this type restraint, or is it a totally bad idea? By the way, the underground elbow is a restrained type mechanical joint. Thanks Bill Brooks Brooks Fire Protection Engineering Inc. _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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