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Old 16-06-2012, 12:29   #1
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Water tank slosh

WE have a Ta Chiao 41. It has a large freash water SS tank under the mid bunk. The problem is at anchor it sloshes, bangs and flexes the metal sides. I was thinking of foaming the tank in to prevent flexing. Any ideas or proven solutions?
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Old 16-06-2012, 13:30   #2
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Re: Water tank slosh

the proper solution, is, of course, baffles built into the tank. but since yours is welded stainless i see little chance of that happening....
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Old 16-06-2012, 13:34   #3
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Re: Water tank slosh

It's not right without baffles. So you have a pretty big problem. Either live with a very annoying problem, or undertake a very serious reconstruction of that tank. Sorry.
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Old 16-06-2012, 14:11   #4
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Re: Water tank slosh

Foaming will deaden the echo/hollow sound as would glueing on a sound attenuating rubber, if no baffles then you gonna always have a surfs up noise, if you don't do something you may get some cracking.....
Baffles are important.
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Old 16-06-2012, 14:50   #5
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Re: Water tank slosh

Isnt there some kind of injectable porous sterile foam you could put in the tank and then fill it??
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Old 16-06-2012, 22:16   #6
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Re: Water tank slosh

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Originally Posted by Nemo55 View Post
Isnt there some kind of injectable porous sterile foam you could put in the tank and then fill it??
Dont think there is anything potable like you mention, closest thing i can think of is a fuel cell on a race car.......lol

Damping the outside by foam or Barium style matting should reduce a lot of it,,,,,,,

Cheers Frank
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Old 17-06-2012, 13:58   #7
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Re: Water tank slosh

Have you heard of baffle balls, they are plastic ball with cut outs, in the UK they are used in big transportable water tanks to reduce sloosh and surge, in a smaller tank, you'll have to check the size of the inspection hatch to make sure you can fit them in. You may have to cut a larger inspection hatch if that's an option for you. Off the shelf baffle balls take about 5% capacity from the tank. In the UK you can get them from Enduramaxx, not sure if they have an agent in the US but maybe worth a look.

Other that that, I would go with squarting PU foam round the outside of the tank as other have surgested.

Good Luck
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Old 17-06-2012, 14:05   #8
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Re: Water tank slosh

If you foam a stainless tank in place you are condemning it to an early death.
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Old 17-06-2012, 14:10   #9
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Re: Water tank slosh

How big is the tank, and the access.
Maybe assemble an egg-crate type of baffle, similar to a 6-pack type of carton.
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Old 18-06-2012, 11:13   #10
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Re: Water tank slosh

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If you foam a stainless tank in place you are condemning it to an early death.
I don't understand how foaming would decrease the tank life?? I would think reducing the flexing would reduce metal fatique and increase tank life . . . please explain.
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Old 18-06-2012, 11:25   #11
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Quote:
Originally Posted by Sailing Partner
I don't understand how foaming would decrease the tank life?? I would think reducing the flexing would reduce metal fatique and increase tank life . . . please explain.
You cant reduce flexing by foaming. The tank will slowly compress the foam over time and it would be back to flexing again very shortly. Depriving stainless of oxygen in a wet environment creates opportunities for crevice corrosion, especially at welds. If you foam it you create that situation.

The baffle balls are your only solution besides cutting it open and placing baffles in it.

You can also either weld stainless bracing in the mid points on the long walls of the tank or similarly cut wood bracing to span the gap between the walls of the tank and it's compartment. This should stop a majority of the flexing and then you can take the option of possibly using soundproofing foam in the compartment the tank is in to alleviate noise...

...having a non baffled tank is an issue, is the boat a home built or custom boat? Or the tank an aftermarket install?
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Old 18-06-2012, 11:26   #12
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Re: Water tank slosh

If it gets wet the foam is a bad idea. If not, I dont see any problem....?
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Old 18-06-2012, 11:32   #13
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Re: Water tank slosh

The only perfect solution is to replace it. Otherwise, the less than perfect solution is foam or noise insulation.

If the noise was making me crazy I would replace it with a polyethylene tank.
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Old 18-06-2012, 11:35   #14
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Re: Water tank slosh

Foaming in a metal tank is a bad idea because of corrosion. Water will, not might, get in between the metal and foam. Once there, it creates a corrosion pocket. The metal on the foamed in Aluminum tanks on a boat I just sold was almost totally gone where the foam was. The boat was 25 years old but the tanks had been leaking for way more than 10 years according to what the PO told me.
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Old 18-06-2012, 14:52   #15
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Re: Water tank slosh

If it's like the tank under the pullman berth in my HC38. It's no where near water. In fact it was well above the cabin sole level. Also, if shaped longer in the fore and aft direction, a normal baffle athwartships may provide little relief! One solution: keep it full! I like the baffle balls idea....
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