Based on the 2013 edition of 13, does a 1" pipe on a cross main feeding a single sprinkler require a restraint (ie. wire restraint)? Per 9.3.6.7, Drops and armovers shall not require restraint. Per the letter of the law, this pipe would be defined as a branchline...right? And therefore would require a restraint...right? Ok, what about when the 1" pipe is only 10" long? At this length, a hanger is not required, but what about the restraint?
If the 1" pipe was 8' long, I can see the need for a restraint, but for a short piece of pipe, does a restraint provide added benefit? For the purpose of restraints, is there a cutoff when the horizontal run should be reclassified as a branchline in lieu of an armover? At 2'? 6'? 10'? Help. Duane Johnson, PE Program Manager Division of the Fire Marshal (Contractor) Office of Research Services National Institutes of Health 301-496-0487 "Protecting Science - One Sprinkler at a Time" _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
