Location of water tank breather pipe - Page 2 - SailNet Community
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post #11 of 21 Old 02-04-2013
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Re: Location of water tank breather pipe

If you want to change where the vent hose ends there are, in my opinion, 2 good locations. High in the hull, near the overhead is one - as long as you have a manual water pump it will come out of the faucet before the vent. This has worked flawlessly on Spencer boats for over 40 years. The other choice is for the vent to end at a spigot into the sink as Swan's used to plumb it.

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post #12 of 21 Old 02-04-2013 Thread Starter
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Re: Location of water tank breather pipe

Now I really like the spigot into the sink idea!

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post #13 of 21 Old 02-05-2013
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Re: Location of water tank breather pipe

My FW tank vents terminate in the anchor locker. No worries about overflow, if even possible.


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post #14 of 21 Old 02-05-2013
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Re: Location of water tank breather pipe

Why not put a vent on the v-berth tank, a quarter turn shut off on the keel tank vent. When filling, you'd open the keel tank vent, once full close it. Seeing how both tanks are connected & the v-berth tank is higher, that vent would provide the relief necessary to prevent a vacuum for both tanks.

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post #15 of 21 Old 02-05-2013
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Re: Location of water tank breather pipe

The bow tank is not vented at all? This seems strange, perhaps an aftermarket additioin by a P.O.? Without a vent, as Misfits pointed out, the resultant vacuum would hinder flow into the lower tank.

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post #16 of 21 Old 02-05-2013 Thread Starter
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Re: Location of water tank breather pipe

Good point, I'll go looking this weekend - there might be a bow tank vent I've not seen yet (or is hidden from view).

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post #17 of 21 Old 02-06-2013
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Re: Location of water tank breather pipe

On both of my boats the drinking water tank vents looped up high and went down into the bilge. I have over-filled my tanks many times and having the bilge pump turn on is a handy way to know that the tank is now full.

I don't understand the contamination issue. Bacteria don't move on their own or fly, so how would they get up and into the high looped vent and then back down into your drinking water tank? Even if the vent was right against the hull, AND you were heeled sharply with a full bilge "some" water could creep partway up the vent tank, but it would get flushed back out next time you over-filled your tank. I can't imagine any scenario where bacteria would go up the hose, over the loop, and contaminate your tank.

Extend the hose into the bilge and spend the rest of your effort on something else. Don't over-think this project.

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post #18 of 21 Old 02-06-2013
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Re: Location of water tank breather pipe

I agree with MedSailor: he doesn't understand the contamination issue. Unless you don't care about bilge fumes affecting your drinking water, I wouldn't extend the vent hose to the bilge. BTW, as you drain your tank, you may be creating a partial vacuum in the vent line, then what do you think might happen (presumably the loop itself isn't vented)?
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post #19 of 21 Old 02-07-2013 Thread Starter
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Re: Location of water tank breather pipe

Well right now the only problem I can see with connecting the pipe to a tap into the sink, is the cost of a tap! I'm seriously thinking of implementing that idea.

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post #20 of 21 Old 02-07-2013
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Re: Location of water tank breather pipe

You don't know what's living in your bilge.

Cross cantamination/cross connection prevention is basic plumbing. Water outlets/vents are supposed to terminate above flood level of the fixture or vessel being served. Funny when folks discuss boats seems the codes we all have to adhere to on land get tossed out the window.

At home you wouldn't connect a hose to your water supply & leave the end of it into your sump pit.

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