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What is the difference between feed main and cross-main in a sprinkler system?
As NFPA 13 mentions, feed main supplies the cross mains but in tree sometimes main pipe continues and supply the branches. What's the difference? Are we talking about each individual piece of pipe? Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
6 Comments
Glenn Berger
12/26/2023 08:07:51 am
There was a Meyer Cheat Sheet fairly recently on this subject. The names of each segment of pipe goes back a long ways. The feed (or bulk) main terminology ends once the system has branch lines to sprinklers.
Jesse
12/26/2023 08:30:20 am
The terminology is such that a feed main supplies the cross main, which supplies the branch lines, which supply the sprinkler. There was an interesting Meyer post on nomenclature a couple weeks back.
Alex
12/26/2023 12:21:53 pm
In a sprinkler system, the feed main is the primary pipeline delivering water from the source, and the cross-main branches off from it to distribute water to the branch lines in turn, feeding the sprinklers.
Dave
12/26/2023 05:38:24 pm
In conversation it can get fuzzy, but straight from the definitions chapter of NFPA 13:
Casey Milhorn
12/27/2023 04:32:38 pm
I had a conversation with a committee member on something similar recently. Not to hijack this thread, but there needs to be another definition included to help with zoning issues/questions. It's too difficult to get into without a long comment here, would be easier with a drawing, but I think we need a differentiator between system feed main and bulk feed mains. A bulk feed main being one that feeds more than one system or zone, and is not limited by the sqft area limitations. Too many times have I had a new designer, an AHJ, etc... ask about this and/or tell me I need to add a new lead-in because my bldg footprint was larger than 52k sqft on a light hazard building. I truly feel like an added definition, along with a little extra language and a couple diagrams, would go a long way in helping clarify this. I'm not saying there isn't some language now, but could be a lot better.
sean
12/31/2023 06:34:46 pm
effectively the same thing Leave a Reply. |
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