Shower water egress question & questions

Discussion in 'Boat Design' started by rsimon, Oct 26, 2012.

  1. rsimon
    Joined: Jun 2011
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    Location: Land locked Florida

    rsimon Junior Member

    Starting the plumbing system for the 34' Marinette houseboat. Trying to keep plumbing system basic and simple, but a few questions: The galley sink drain is to run out through a "Y" valve giving me a choice of draining out to gray tank or out the thru hull. Can I "T" in my shower sump drain ABOVE the "Y" valve to give me shower water egress through that same hose? I hope the pictures will help a little: system/?action=view&current=a818cb37.jpg
    Notice that my one and only thru-hull is right about AT the water line, however, the Maeleron thru-hull is attached to a 90 deg. elbow that extends ABOVE the water line as depicted: system/?action=view&current=7580817d.jpg This is where my sink and shower sump is to drain. Here is the rest of the pictures and concerns and questions about my water system: water system/
    for example were should the water heater by-pass valve go: system/?action=view&current=7c62a064.jpg
    Also, I want to install a manual hand pump in the galley to pull water from my freshwater tank. Where do I install that? Where on the actual tank, and is that a different water line than the electric/on-demand water pump system?
    Joined: Oct 2002
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    FAST FRED Senior Member

    Usually a simple by pass valve allows the fresh water pump to be either the manual or electric , sucking from the same tank port.
  3. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    There should be a one way valve to prevent city water from back filling the water tank. Is that in what you call a "distribution manifold'? Adding drains together have to take into account the total flow. If you connect the shower to the sink, it may back flow out of the sink drain. The plumbing doesn't need to be so complicated. The easiest would be to drain all the gray water into the gray water holding tank and have the pump connected to the tank drain.

  4. michael pierzga
    Joined: Dec 2008
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    Location: spain

    michael pierzga Senior Member

    Marine Plumbing is not as simple as you think.

    Best to pick up a book like Nigel Calders ,Boat Owners Mechanical and Electrical Manual for reference and to avoid common mistakes like poor grey, black water tank venting . Several other books around...check at your library
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