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Go Back   SailNet Community > On Board > Gear & Maintenance > Water tank vent
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Thread: Water tank vent Reply to Thread
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Topic Review (Newest First)
4 Weeks Ago 12:48 PM
capt jgwinks
Re: Water tank vent

Routing the hose is important. If there are any low spots that can hold fluid, the line is blocked. Needs a straight down hill run to the tank. It's more critical on waste and fuel tanks, waste held in the hose will stink, fuel will rot the hose.
4 Weeks Ago 12:26 PM
capt jgwinks
Re: Water tank vent

Quote:
Originally Posted by Boasun View Post
you could have the vent coming up through the deck next to a stanchion or the house. With a loop at the top and screened to keep out the vermin. Then it is in sight as you fill your water tank. This is the way it is done on work boats. Then when we have an overflow we know that the tank is pressed up.
But what ever you do, DO NOT combine the fuel vent with the Water vent... A definite NO NO!
A friend of mine was having trouble with water getting into his fuel tank, couldn't figure out how it was happening. Turns out the PO tee'd the propane locker vent into the fuel tank vent. Did I mention that most PO's are morons?
4 Weeks Ago 11:04 AM
pdqaltair
Re: Water tank vent

Quote:
Originally Posted by monroe View Post
Our Freedom 39 did not have vents, and we got the geyser frequently, especially when the Mexican water guys glug in the 20l jugs. For right now we have drilled a small hole in the top of each. We are concerned about bugs, dirt, mold, and bacteria. Is there some kind of check valve we should install?

Yes I know this thread is 8 years old ;-)


I assume "check valve" was either a misunderstanding or misuse of nomenclature; the vent must pass air both directions.

The plumbing code and AYBC require a 20 mesh screen to keep mosquitos and spiders out; I can't imagine why most boats do not take this simple precaution. An simple in-line water strainer do.

As for microorganisms, the ultra pure water people use very fine hydrophobic filters on vents, but unless you are sub-micron filtering all of the fill water, and so long as you chlorinate the water, this is overkill. Additionally, if the vent has a good high loop, that will reduce contamination too.
4 Weeks Ago 10:45 AM
capt jgwinks
Re: Water tank vent

Routing of the vent hose is just as important. If there's a low spot, it's effectively blocked. Has to be down hill all the way from vent to tank so liquid is never held in the hose. More critical on waste and fuel tanks. Waste held in the hose will stink, fuel will rot the hose.
4 Weeks Ago 09:50 AM
albrazzi
Re: Water tank vent

No vent huh, how do you prevent the Tank from being collapsed while using water. Are you sure there is no vent anywhere ? if you fill fast through jugs it will backwash, the vent is not big enough to take a fill that fast especially if its tight in the filler as I suspect. No check valve here they are probably deflecting the tank while filling too fast and its just relaxing and spewing.
Vent could still be clogged find it and clean it.
4 Weeks Ago 08:52 AM
monroe
Re: Water tank vent

Our Freedom 39 did not have vents, and we got the geyser frequently, especially when the Mexican water guys glug in the 20l jugs. For right now we have drilled a small hole in the top of each. We are concerned about bugs, dirt, mold, and bacteria. Is there some kind of check valve we should install?

Yes I know this thread is 8 years old ;-)
06-25-2007 11:23 AM
snorphinj Thanks all! I think i will skip replacing the vents on the side of the hull which are almost impossible to reach without dismantling parts of the interior and put new vent hoses on the water tanks which I can lead out a port when refilling. I'll also stand by while filling rather than going to the store or taking a nap.
06-24-2007 04:55 PM
TrueBlue
Quote:
Originally Posted by morganmike
I'm not arguing that there are some clueless people out there, I'm arguing that your post did nothing to answer the OP's question. The OP asked about best location for a tank vent, discussion ensued around that topic. You come in, master of the obvious, and post an off-topic know-it-all response about WHY we need a tank vent, which nobody was debating. The fact that someone came in afterward and asked if their tank might not have a vent does nothing to vindicate you.
It seems you're the one with a venting problem mike . . . lighten up, or try a little more fiber in your diet.
06-23-2007 09:43 PM
labatt I'll look at the bug route, but it's literally a 3 foot run, almost straight up, from the tank to the vent. It's a 1/2" tube with a clear hose (potable water hose) with a white vent cap plugging the top. Not too many places for problems... We usually leave the hose on full open when filling, so maybe it's too fast... We only have the problem with the one tank though. It's on my list now, but under fixing my head issue... I love owning a boat!!! I can't complain though...
06-23-2007 09:04 PM
camaraderie Labatt...in addition to what dawg said...sometimes water finds a low point in the vent line and pools there...effectively blocking the vent. Blow out the line with an air compressor if you don't find an alternate solution.
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