General - Trunk to branch sizing?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by sahayda, Oct 5, 2008.

  1. sahayda

    sahayda New Member

    Oct 4, 2008
    Hi all. Great forum.

    I'm new here and have tried searching around a little but so far haven't found a general discussion on trunk to branch sizing for water and heat I apologize if the following quesiton might well have been addressed but I just haven't found it yet.

    I guess I'm thinking there's probably a chart somewhere with recommendations for trunk size with an assumed maximum number of simultaneously operating branches flowing from (or to) it?

    I'm thinking in the realm of domestic water and hydronic heat distribution. Also, I'm not sure it would make a difference but I'm not thinking in terms of a manifold system, rather mid-run branch/trunk junctions. I'd be curious to know though if anything changes in the recommended sizing if the manifold approach were used. (Fluid dynamics wasn't exactly my best subject in school...:D)

  2. nhmaster

    nhmaster Master Plumber

    Jul 30, 2008
    Tech. Instructor
    S. Maine
    Any code book will have these charts in the appendix, for potable wter distribution. For heating you can find information at and also Calleffi just put out the new Idronics 4 which addresses hydronic manifold systems.
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