[Public-List] Deck Drains on Liner Boat

[George Mathis]

I just re-assembled my boat from scratch, so I may not be the best example, but I think the layout I described works well. At serious angles of heel, the deck drains are not going to be working anyway ... no water will be running into them.
You should not have "low points" in the deck drain line obviously, but don't fret if you have a small one for a short run. 
It was pretty simple to arrange the semi-rigid hose in such a way that low points were avoided in my case. Routing the hoses through the cockpit locker is sort of annoying, as you have to be mindful of not laying a huge anchor atop them ... but not a deal breaker. I don't think my anchors could collapse the hose anyway.
My deck drain hoses are the same diameter as the cockpit drains. I believe the standard thru-hulls under the engine are one inch (I believe), but those can be expanded.
I would try to avoid reducers.
I have never heard of anyone saying the cockpit in an Alberg 30 drains too slowly with stock equipment, so I would not stress over it, unless you are planning to go seriously offshore. There is an Alberg 30 next to mine being prepped for circumnavigation-type voyages and it is using the same, stock deck drain layout but the thru-hulls are bigger, maybe 1.5 inches? I will have to ask.
I would not try to clean hoses as you describe. If you get one of those cheap high-pressure attachments for a garden hose and remove the grill thing from the deck drain and shoot the water stream down the hose, that will remove any debris I can imagine you'd possibly accumulate.
Just my thoughts. Once again, I am no expert, but I would not overthink the drain plumbing. Seems to work well for what most people use their boats for.
I will look for photos.







 
 






> Date: Mon, 10 Oct 2011 13:01:08 -0400
> From: jriley at dsbscience.com
> To: public-list at lists.alberg30.org
> Subject: Re: [Public-List] Deck Drains on Liner Boat
> 
> George Mathis wrote:
> > I just redid mine (#439)
> > The deck drains go to the cockpit lockers to the engine compartment and join the cockpit drains and go out through thru-hulls under where the engine should be.
> > I can send you some photos of my new setup, if you like. 
> > I believe the lazarette thru-hulls are for engine exhaust, or at least one was on my boat. 
> > -- George
> >
> >
> >   
> 
> Hi George,
> 
> Some photos would be great.
> 
> There were a couple of major problems with the way mine were done ("T"d
> into the cockpit drains). 
> 
> First, the hose sizes did not match, so there were multiple stages of
> reducers, thus the drains ultimately were not as large as they COULD
> have been.
> 
> Second, the hoses leading from the deck drains dipped low, then
> 'swooped' up to the "T", so that there was a low point.  They did not
> fully drain, and any trash that got into the hose settled in the low
> part (ultimately clogging the line).
> 
> Third, the geometry of the "T" made cleaning the hoses and through-hulls
> (boat in the water) with a snake from either end, cockpit or deck,
> impossible.  The only way to clean the lines was to disassemble the "T"
> below the waterline (close the ball valve), attach an 'extension hose'
> and clean that way.
> 
> The "system" did not work well at all, and took a BUNCH of room below.
> 
> So, I'd LOVE to see your photos and to hear how it performs.  If you
> were to fill your cockpit to the locker lid level, say, how long does it
> take to drain?
> 
> -- 
> John S. Riley
> S/V Gaelic Sea
> 1972 Alberg 30 #521
> 
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