The requirement for trapeze hangers matches the requirement for the building structure found in 9.2.1.3.1." The safety factor of five is used in the traditional listing requirements for hangers and is also found in the performance-based criteria of 9.1.1.2(1). Other types of hangers are generally required to be able to support five times the weight of the water-filled piping plus 250lb. "A trapeze hanger, as shown in Exhibit 9.2, must be capable of supporting the weight of the water-filled piping plus 250lbs. I'm thinking my last go around with this was a shared support situation (see 9.1.1.3.1.1 13-16 Ed.), but in a sprinkler only assembly I probably lost an argument.Īttachments from structure to Unistrut & the Unistrut to the pipe does require the 5x per 9.1.1.7.5 but the actual Unistrut only needs to comply with 9.2.1.3.1 Dave - Na.call me out, I'm gonna get it wrong (and I did so nice catch) and I'm fine with it (wish I could edit the statement above so others don't read and apply things incorrectly - ahem.Joe? wish list for the forum).
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