Folks, If you use the FM friction losses then when the FM rep comes out the bends have to be of the proper radius. If you use the FM criteria without an FM rep. involved it is still the same. By the way.....either way you need to make sure you are using the right model flexible drop. Braided vs. unbraided, proper length installed etc....
The thing to avoid mostly is using the UL criteria on an FM job without talking to the FM rep first. If he/she inspects the job and you have a bunch of 3" bends and unbraided flex drops.....someone is gonna have some splainin' to do. (To the best of my knowledge FM hasn't approved any of the unbraided models) Dan - Excellent tip with the coffee can. Was that plastic or aluminum? Will be checking Maxwell House and Target brand to see if we can add to the list. :) One more thing for you designer folks... Make sure your field personnel know exactly what they can and can't do. Doesn't matter what you calc if the flexible drops are installed with kinks in it. If you are running your piping 1'-0" above the ceiling directly above the ceiling tile you intend to drop in and you expect the fitter to drop without exceeding the bend radius limit....you're out of your tree. Simple details on prints go a long way...... This is no different than using CPVC piping or any other specialty piece of equipment. If you are gonna use it you have to follow the rules. And the makes and models aren't interchangeable. Ken Holsopple _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
