Anyone know why DI piping is not listed as above ground piping in NFPA 13? I get it's probably not practical for a variety of reasons. Not practical is not what I'm looking for. I'm curious if there are technical reasons like it's too brittle, it rusts to fast, it requires different hangers. I don't think those examples are real and can't think of a reason it's any worse than plastic.
What I have is the contractor ran about 50' and a couple turns of DI above ground between the BFP and where they switched to galvanized piping. It's all outside in a non-freezing climate, also earthquake country. It's mostly flanged connections and supported well with pipe stands. On the surface there doesn't appear to be a reason not to accept it but for the pesky NFPA 13. I'm trying to accept it just don't want to overlook a failure point. Chris Cahill, PE* Associate Fire Protection Engineer Burns & McDonnell Phone: 952.656.3652 Fax: 952.229.2923 [email protected]<mailto:[email protected]> www.burnsmcd.com<http://www.burnsmcd.com/> *Registered in: MN The pain you feel today is the strength you'll feel tomorrow. - Unknown
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