[Public-List] V berth water tank

[David Terrell]

Jason

I did some epoxy coating - there were hair line crack- crazing.  I did 
not slather it up with many coats of epoxy. I  used regular west marine 
epoxy. I was not concerned because I do not plan to drink the water. 
And, honestly, I do not know if there is a real problem with what I 
used.  I would be very interested in being enlightened on this topic by 
anyone in the know on this.

David


On Sun, Jul 21, 2013 at 8:45 AM, Jason S wrote:

> Dave,
> Did you coat inside of tank.
> .if so with what type of epoxy
>
> Jason
> #457 Salacia
> Www.svsalacia.blogspot.com
> On Jul 21, 2013 7:39 AM, "David Terrell" <dterrell1 at charter.net> 
> wrote:
>
>> I did what  George did and the result is excellent. I do not see a 
>> need
>> for further changes. I used starboard for the top. Pictures  and a
>> description are posted on the web site.
>>
>> David 432
>>
>>
>> On Sat, Jul 20, 2013 at 4:40 PM, George Dinwiddie wrote:
>>
>>  Bill,
>>>
>>> On 7/19/13 10:07 AM, Bill Newman wrote:
>>>
>>>> My No. 233 is a non liner boat that I have owned for about 12 
>>>> years.
>>>> The water tank is fibreglass and is I believe, tabbed to the hull.
>>>>
>>>
>>> The usual arrangement is a tank that uses the hull and some laid up 
>>> glass
>>> to form the bottom and sides. The top was generally a sheet of 
>>> aluminum
>>> bedded and pop-riveted across the flanges of the sides.
>>>
>>> The usual problems are that
>>>  1. the fiberglas becomes saturated with water and slowly leaches 
>>> into
>>> the water
>>>  2. the aluminum corrodes, flaking white aluminum oxide into the 
>>> water
>>>  3. the pop-rivets start to leak
>>>
>>>  Originally it had no inspection port so later I made one and found 
>>> a
>>>> very moldy plastic bladder inside the tank.  I removed this and
>>>> thoroughly cleaned the interior of the fibreglass tank and used 
>>>> this
>>>> for a few years until it began to leak.  I then cut a larger 
>>>> opening
>>>> into the top and installled a bladder which does not conform well 
>>>> the
>>>> the shape of the tank.  If it is completely filled it bulges out 
>>>> the
>>>> opening and leaks some water no matter how well the fittings are
>>>> tightened.  The result is that I cannot carry a lot of water with
>>>> this arrangement.  I do not use the tank for drinking or cooking 
>>>> just
>>>> for washing myself and the dishes.  I am thinking of temporalily
>>>> removing some of the furniture from the v berth, then making a
>>>> cardboard mock-up of a tank that fits the space and taking this to 
>>>> a
>>>> tank maker to have it fabricated.  I am thin king of having this 
>>>> made
>>>> of aluminum because there are several companies who will do this 
>>>> and
>>>> a mold is not required.  I expect my experience is not unique.  My
>>>> question is. has anyone had any experience  replacing the water 
>>>> tank
>>>> under the v berth and if so any advice or information about how to
>>>> proceed and the results will be much appreciated.
>>>>
>>>
>>> I would not recommend using aluminum. Like the original aluminum 
>>> top, it
>>> will oxidize and flake white aluminum oxide into the water.
>>>
>>> The usual fix for the water tank is to
>>>  1. remove the furniture
>>>  2. remove the top of the tank
>>>  3. clean the tank well
>>>  4. coat the fiberglas walls with epoxy
>>>  5. put on a new, non-aluminum top (high-density polyethelyne or
>>> reinforced epoxy sheet) bedded with good caulk, and using 
>>> self-tapping
>>> screws instead of pop-rivets
>>>
>>> If you do this and add a charcoal filter, you should have water 
>>> suitable
>>> for drinking.
>>>
>>> Of course, you still need to clean the inside occasionally through a 
>>> port
>>> on the top, and you may want to dose with chlorine (plain chlorox) 
>>> when you
>>> fill the tank.
>>>
>>>  - George
>>>
>>> --
>>>
>>> ------------------------------**------------------------------**
>>> ----------
>>>   When I remember bygone days                         George 
>>> Dinwiddie
>>>   I think how evening follows morn; 
>>> gdinwiddie at alberg30.org
>>>   So many I loved were not yet dead, 
>>> http://www.Alberg30.org
>>>   So many I love were not yet born.                          also 
>>> see:
>>>                'The Middle' by Ogden Nash 
>>> http://idiacomputing.com
>>>
>>> ------------------------------**------------------------------**
>>> ----------
>>>
>>>
>>>
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