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    mardin's Avatar
    mardin Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Mar 2, 2009, 04:30 PM
    What size manifold do I need?
    What size manifold do I need to supply water to five 1.6(gpm) Water closet, Tank, One Piece; one Urinal, Valve 15(gpm), one Lavatory 4(gpm) and one Drinking Fountain Flow Rate 0.75(gpm)?
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #2

    Mar 2, 2009, 05:33 PM

    3/4" pipe should be all that's needed, then use 1/2" to each fixture. Keep in mind that all fixtures will not likely be in use at the same time. I think you are missing a decimal point on that urinal flush rate.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #3

    Mar 2, 2009, 05:48 PM
    I would come off a 1" main with 3/4" manifolds feeding not over 3 fixtures off a 1/2" branch. Good luck, Tom
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
    Senior Plumbing Expert
    		  
    #4

    Mar 2, 2009, 06:23 PM
    Hi all:

    Just to make this clear: A urinal in itself requires a 3/4" feed. I am sure that Bob simply forgot this... ;)

    As Tom stated, a 1" pipe manifold should do the job here... :) (3/4" to the urinal, 1/2" to each toilet, 1/2" cold (and 1/2" hot) to the lavatory and 1/2" to the drinking fountain).

    MARK
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,192, Reputation: 523
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    #5

    Mar 2, 2009, 06:27 PM

    Is this commercial job ?
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
    Senior Plumbing Expert
    		  
    #6

    Mar 2, 2009, 06:31 PM
    Commercial or not Milo... still requires 1" minimum cold water pipe.. ;)

    Let me know what you are thinking here...

    MARK
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,192, Reputation: 523
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    #7

    Mar 2, 2009, 06:34 PM

    I disagree with you Mark, If this is a commercial project than each plumbing fixture requires 3/4" , type L, supply. Urinals / flush valves may be 1", therefore they would require 1" supplies. Therefore, depending on developed length of the supply pipe for the fixtures given - the supply should be more like 1 1/2".
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
    Senior Plumbing Expert
    		  
    #8

    Mar 2, 2009, 06:36 PM
    If the toilets are flushometer type toilets then I absolutely agree with you Milo... but most commercial applications in my area are now using typical floor-mount toilets so only need a 1/2" line to each... ;)

    I see where you were going...for sure!

    Mardin... we need more info. Here... commercial or residential? Let us know?

    Milo, do they allow floor-mounted toilets for commercial application in your area..? And I have never seen a 1" urinal flushometer..???

    Milo...

    Mardin did say "five 1.6(gpm) Water closet, Tank, One Piece"... why I stated the size as confidently as I did... ;)
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,192, Reputation: 523
    Plumbing Expert
    		  
    #9

    Mar 2, 2009, 07:34 PM
    Mark, Yes, they allow floor mounted commercial toilets with tank. However, they are not too popular bcs they are constantly broken (people flush with their foot )
    Yes, 1" flush valve is common (Zurn, Sloan) - at least here...
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