I had always thought that couplings didn't need to be calculated under NFPA 13, but I'm reviewing a set of calculations which show 1-foot of schedule 40 equivalent for each coupling. This is for a 4-inch main with roll-groove couplings. Any ideas?
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4 Comments
Names.R.Hard
9/12/2019 10:46:44 am
Hmmmm, it looks like it was an old FM requirement from datasheet 2-8N, which seems to no longer be used. I couldn't find any record of it in the FM 2-0 or 3-0..
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Wayne Ammons
9/13/2019 09:38:09 am
This is no longer a requirement in FM Data Sheets. I spoke with Victaulic concerning their data sheet 26.08 for Roll Grooved Pipe, which references the now obsolete FMDS 2-8N, and was informed that their data sheet has not been updated to reflect this.
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Wayne Ammons
9/13/2019 11:05:29 am
I posed the question to NFSA's Expert of the Day and here is the response:
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