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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #11  
Old 06-22-2007
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Quote:
Originally Posted by labatt
We'll have to track ours down. Is it possible that some boats don't have a vent? When we fill our tanks we get big "thunk" sounds as they fill. When you pull the hose out of the deck fitting, you usually get a big geyser shooting out of it. I'm assuming the sounds are just due to the weight of the water pushing on the tank, but I'm not sure about the geyser...
The geyser you experience could be from feeding water at a rate that exceeds the vent's ability to handle it.

Upsize your vent lines/fittings and that should help. (or fill your tank more slowly)
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Old 06-22-2007
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Quote:
Originally Posted by TrueBlue
All tanks need to be vented labatt. Yours may just be blocked.
That's actually what I was figuring... the geyser just seemed strange and made me question whether it was vented. Being blocked makes more sense.
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Mine vent into the bilges. Bloody annoying. I am going to group my fuel, water and exhaust vents and send them vertically, inside a big brass pole I'll get from a strip club (plenty of Nevr-Dull on it first, shine or not!) to multiple goosenecks atop the pilothouse. If I overfill something, the pitter-patter of little raindrops will let me know.

Vents at the hull/deck join are idiotic. I can't tell you how many stories I've read about fuel or water contamination once the rail is buried and the salt water goes (inevitably) downhill.
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Labatt-

Sounds like you've got either a blocked vent—insects and such do this a lot—or no vent at all.
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Old 06-22-2007
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Thinking about this problem... Maybe if you routed your vent into the cockpit. That way while filling the water tank you can nap in the cockpit and when your feet get wet you know the tank is full. Also when you are sailing with beam ends in the water you won't worry about your tanks being contaminated.
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Old 06-23-2007
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Quote:
Originally Posted by Boasun
Thinking about this problem... Maybe if you routed your vent into the cockpit. That way while filling the water tank you can nap in the cockpit and when your feet get wet you know the tank is full. Also when you are sailing with beam ends in the water you won't worry about your tanks being contaminated.
Amusing, but the idea of having all vents leading up and out well above the waterline is a good practice. When diagnosing an exhaust problem, I cable-tied a hose from the siphon break right out of the engine compartment and into the cockpit in order to achieve the recommended "16 inches above the waterline" requirement. The cheerful little ejaculations of H20 during engine operations were proof that I had both good flow and no water siphoning back into the manifold, as had been the case.

Now, running those vents to where I can see them is SOP.
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Old 06-23-2007
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The tank has to have a vent or the resulting vacuum would be such that no liquid could be extracted. Vacuum is stronger than pressure.
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Old 06-23-2007
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a big brass pole I'll get from a strip club (plenty of Nevr-Dull on it first, shine or not!)
Or you could leave it dirty and have a unique air freshener "Memories of Amber" (and Tiffany, and Kristal, etc., etc.....)

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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.
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Old 06-23-2007
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Found one of my vents - it's inside one of my interior cabinets (where I store all my emergency equipment such as flares). The geyser must be due to filling the tank too rapidly for the vent to keep up.
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