Why can't the cross main in your case be called a 'branchline' since it fits the description of one per the definition of '13: "The pipes supplying sprinklers, either directly or through sprigs, drops, return bends, or arm-overs." Then the 'armover' could magically become an.... armover.
On Wed, Jan 8, 2014 at 5:02 AM, Johnson, Duane (NIH/OD/ORS) [C] < [email protected]> wrote: > 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 > _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
