Blowing out fresh water tanks: revisited - SailNet Community

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Old 10-14-2013
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Blowing out fresh water tanks: revisited

Hello all, I went to be boat yesterday to try to blow out the water lines with compressed air, as I had posted last week

How to blow out fresh water tanks

I had found a tire inflator at Meijer that allowed you set it to automatically shut off if it reached a certain PSI, and set it to shut off at 18.5 PSI as recommended by Eherlily. Anyway, it worked out pretty well, but there at the end it seemed like I could never get the last little bit of water out of the hoses.

The compressor would be switched on, I would monitor how much pressure was building up, and when it got to 12-15 psi I would open the faucet, and about another tablespoon or so of water would spurt out, then I'd get air, and a very quiet gurgling. So I'd close the faucet, let the pressure build up, open the faucet and get another tablespoon or so of water, and so on and so on. Is this normal?

Also, I had to sponge out the forward water tank, because there was about another half gallon of water in there. I noticed that the access cap for the water tank has some sort of fluid in it. I looked at it closely to see if there was a plug in it to allow me to drain what I assume is water, but it appears to be perfectly sealed. No cracks or anything that would allow water to penetrate, so I thought well maybe it has fluid in it on purpose, but I can't think of why that would be. Any ideas?


Thanks all!
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Old 10-14-2013
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Re: Blowing out fresh water tanks: revisited

Freeze damage happens when the water is contained to where it has no room to expand when it freezes. Some water in the bottom of a tank is not really contained and won't be a problem if it freezes. I believe the same would be true with the last bits left in a pipe. To get as much as possible out of a pipe, though, you might undo a fitting at a low point and let it drain.
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