V-berth water tank vent

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1 year 11 months 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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1 year 11 months 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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