V-berth water tank vent

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8 months 1 week ago #3431 by Robert Horn
V-berth water tank vent was created by Robert Horn
Is there a vent for the V-berth tank and if so, where does it go?

Thanks,

Bob
 

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8 months 1 week ago #3432 by Scott Lee
Replied by Scott Lee on topic V-berth water tank vent
Mine vents inside the chain locker.

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8 months 1 week ago #3435 by Robert Horn
Replied by Robert Horn on topic V-berth water tank vent
Thanks, I could have figured that out, but we took down the head sail last summer in anticipation of one of the tropical storms and have not put it back up so it's stuffed into the V-berth.
Same question for the belly water tanks. This is Lew and Deborah Streeters old boat and they put an AL water tank and an AL diesel tank into each of the belly water tanks. I see no sign of where the original water tanks might have vented.
Thanks,
Bob

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8 months 1 week ago #3436 by Bill Chamberlain
Replied by Bill Chamberlain on topic V-berth water tank vent
My bow water tank vents to the top of the fill fitting, just below the deck. The belly tanks vent to each other, which seems a bit odd to me, but that is what it is. Discovered that when filling the port tank, and found myself with water coming into the bilge from the leaking unused starboard tank the first time I filled the port tank! Already knew the starboard tank was bad when I bought the boat. So wasn't even trying to fill that one LOL.

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8 months 1 week ago #3437 by Scott Lee
Replied by Scott Lee on topic V-berth water tank vent
The belly tank's vents combined at a tee fitting at the base of the mast box then up the mast box about 5 or 6 feet.

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8 months 1 week ago #3438 by Robert Horn
Replied by Robert Horn on topic V-berth water tank vent
Thanks for the responses. Venting up the mast may not be a solution. There is a valve that when opened and on dock water, will fill the tank that the selector valve is set to. Dock water pressure would blow out the top of that kind of vent. Something else to work on.

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8 months 1 week ago #3439 by Scott Lee
Replied by Scott Lee on topic V-berth water tank vent
Water storage tanks, either original or replacement, are not designed to handle dockside water pressure. Do not pressurize your tanks. Part of the purpose of the tank vent is to prevent over-pressurization of the tanks. Storage tanks are typically built to handle less than 5 psi. Dockside water pressure would be at least 40 psi, probably closer to 60 psi or more.

I have similar valving on my boat. With it, I can (carefully) fill the tanks OR, by bypassing the tanks, pressurize the house plumbing. While theoretically I could pressurize the tanks if the valves were set incorrectly, I would quickly regret doing so. Especially if they were not vented.

Your tank is certainly vented somewhere. The water that you use at the sinks has to be replaced by air as the level in the tank goes down.

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8 months 1 week ago #3442 by Robert Horn
Replied by Robert Horn on topic V-berth water tank vent
I agree with all of the above, but have yet to find vents on the two AL water tanks sitting inside the original water tanks. The two AL fuel tanks down there do have vents connected to the vent for the port saddle tank.
I will investigate further. Last weekend, while I was on the boat, the inlet fitting to the dock water pressure regulator broke. One reason I never leave the dock water connected when not on the boat.

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