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  #11  
Old 03-04-2013
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Re: Cockpit Drains

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Yeah and my shower drains to the holding tank which I also think is kinda stoopid
It would be nice not to have to decide between showering and using the head.

If I wanted more cockpit drainage capacity, I think I would leave the original drains alone, and add two large additional drains at the other end of the cockpit, or, through the transom if possible.
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  #12  
Old 03-06-2013
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Re: Cockpit Drains

The engine is out and I started to puzzle out the MSD system. It is more confusing than advanced algebra. It seems I have a gray water tank and a black water tank, there is a wye valve under the floorboards marked Overboard and Holding tank. At the rear of the heasd is a manual pump. It feeeds into a a Y, the other two legs go to the deck fitting and I assume the thru hull. If you want to pump the gray water tank yu jhave to pump it through the black water tank.

Anyway, what a system, I later found out the manual pump was de riguer equipment for 1980 vintage boats.

Guess I will have to replace most if not all of this or simpley pull the head, pump the tanks and install prta-potti for short cruises.

What water require capture of gray water? All my sinks drain direct via thru hulls, why don;t they go to the grey water tank?
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Last edited by katsailor; 03-06-2013 at 12:24 AM.
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  #13  
Old 03-06-2013
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Re: Cockpit Drains

Sounds like a pretty strange arrangement. Normally the shower drain is plumbed to a device like this:Shower Sump Pump Systems : Attwood Marine
Basically a box with a removable lid, containing a bilge pump, float switch, and strainer. It pumps automatically when the level rises enough.
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  #14  
Old 03-06-2013
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Re: Cockpit Drains

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Originally Posted by katsailor View Post
.......What water require capture of gray water? All my sinks drain direct via thru hulls, why don;t they go to the grey water tank?
Grey water restrictions are all local, so you would have to research.

Nantucket Harbor is one, but honestly, I can not believe that virtually any of the hundreds of boats on moorings or anchor have grey water holding or shut down all showers and sinks. The harbor is very contained, probably doesn't flush well and has oyster beds (or maybe clams), so I understand what they are trying to do. They are excellent at getting a free pump out boat to you quickly to keep from discharging black water. Way to go on that one.
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Old 03-06-2013
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Re: Cockpit Drains

if a cockpit is 8 x 6 and 3 feet deep, and has half that space taken up with seats, wheels tables etc.. that leaves 72 cubic feet of volume.

72 cubic feet of water (64 lbs per cf) = 4608 pounds.
That will shift a water line a touch, it's 25% of my displacement

European Boatbuilder has lots of good info
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