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  #1  
Old 09-03-2013
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Why does the galley sink drain...

To a below the waterline seacock? The sink from the head drains to a through hull above the waterline. Why not the galley sink? Where does your grey water exit your boat?

Dave
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Old 09-03-2013
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Re: Why does the galley sink drain...

All of ours exit below the waterline. That's holding tanks, sinks and showers
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Old 09-03-2013
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Re: Why does the galley sink drain...

If I recall correctly, both sinks on mine drain above the waterline.
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Old 09-03-2013
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Re: Why does the galley sink drain...

My galley sink drains below the waterline.

My guess is that keeps unsightly stains off the hull.

I'm not saying it is great logic; that's just my guess.

Ken
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Old 09-03-2013
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Re: Why does the galley sink drain...

Mine exit below the water line.

That said, what is the location of your sink(s)? If the sink is off centerline or there abouts, then it can back fill the boat while sailing. Centerline sinks generally don't do this as they are above waterline.

Different manufactures deal with this in their own way. Swan puts a plastic valve on the sink drain to stop water intrusion. Little Harbor had the pump in / pump out idea with a macerator on each sink, Oyster does similar. Hanse and Benateau will bulk head mount holding tanks and allow for a tank drain by opening the seacock. Others I have seen go to sumps then over board either at water line or just under deck level.

Personally I prefer the center line sink with below deck drain, as it never back fills, or need any extra pump or effort (like closing a valve while sailing)
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Old 09-03-2013
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Re: Why does the galley sink drain...

my little seasprite has a below water drain.
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Old 09-04-2013
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Re: Why does the galley sink drain...

In many cases the bottom of a galley sink is very close to the waterline, which means it simply can't go overboard. Overboard discharges of gray water are noisy, messy, and can, as mentioned, creates stains on the hull. Both our head and galley sinks drain underwater.
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Old 09-04-2013
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Re: Why does the galley sink drain...

Below the water, straight down.
Even my head sinks are plumbed that way.

I've seen boats that sit at dock and spew water out onto neighbors. Bad design.
Having said that my deck funnels water to midships and spews that like a hose in a hard rain
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