Can all main drains can be joined in one pipe?
If they can, does this pipe need to be capable of handling all flow at the same time? Are there any downsides to ganging them together? Thanks in advance. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
9 Comments
Daniel Arnold
12/20/2023 08:10:08 am
If I understand your question, in my view ganged drains should not be installed on a dry system as it /they may functionally create a semi gridded system that could cause delay valve opening and delivery times.
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Daniel Arnold
12/20/2023 08:12:25 am
Are you only asking about wp main drains? If so, I see no problem with that.
Reply
Jesse
12/20/2023 08:17:50 am
I think the OP is referring to main drains. I don't see a problem with ganging multiple main drains from wet-systems
Reply
Andrew M.
12/20/2023 08:43:19 am
In NFPA 13 2016, - Table 8.16.2.4.2 will size the drain based off of Riser Size. When Drains are joined into one pipe (Drain Riser) the drain size must be one size larger than any drain tying into it per 8.16.2.4.8
Reply
Dan Wilder
12/20/2023 09:43:24 am
Truly depends on what is being drained.
Reply
Alex
12/20/2023 11:43:11 am
I have no issue with tying in multiple drains. Confirm piping sizing as Andrew mentioned.
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Glenn Berger
12/20/2023 12:37:20 pm
Main drains can be tied together and sized for one system being drained at a time. Aux drains on wet systems can be tied together. Aux drains on dry or preaction systems needs to be reviewed to ensure a grid is not being introduced into the system.
Reply
Anthony
12/21/2023 07:10:23 am
I concur with Glen, Andrew and Alex here.
Reply
sean
12/31/2023 06:09:05 pm
Yes.
Reply
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