Ok, so its Monday, might as well start the week with a stupid question for all y'all...
Considerations: bulk / cross mains being hung in a pre-eng building with butler framing and purlins, for conversation sake let's say the bays are 40'-0. I recall at one point that mains "shall" be hung / supported from the primary building structure, I believe the NFPA big book says to "hang the big pipe from the big steel" or something to that effect... Essentially, the idea to throw a hanger where a sprinkler main crosses a beam / girder / butler frame has been stuck in my mind for years as a requirement by code. Just recently I found myself doing the old guy thing after a site walk through where a 7 year licensed union fitter didn't have any hangers on the butler framing at all. There I was, reading through that section of chapter 9, saying "I friggin swear it's in here..." and nothing at all about a requirement to have an attachment at the framing forming the bay. There is the implied common sense that you will have an attachment there (at the butler framing) with how 9.2.4.2 through 9.2.4.4 are worded, where "intermittent" hangers can be omitted blah blah blah... So, time for the stupid question - Is it the reliance on the physical requirement that hangers on the main shall be installed between the branch lines (9.2.4.1) where you will obviously have bays / branch lines split across butler framing? Am I missing where (if it's actually in there) there is a statement for main hangers to be supported at any crossing of primary structural components? _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
