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Old 06-12-2018, 06:12   #1
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Source for Parabolic Shape Tanks?

Hi,
I've been looking all over for polyethylene water tanks shaped like my bilge.

My bilge is a parabola where a is 12" and b is 40".



The flat top of the parabola is my cabin sole.

Where do you get tanks shaped like this or custom tanks built like this?

The third dimension is about 52" .
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Old 06-12-2018, 07:01   #2
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Re: Source for Parabolic Shape Tanks?

Will flexible tanks work?

https://www.westmarine.com/buy/imtra...95?recordNum=3
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Old 06-12-2018, 07:02   #3
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Re: Source for Parabolic Shape Tanks?

try Ronco Plastics Marine Tanks
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Old 06-12-2018, 07:30   #4
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Re: Source for Parabolic Shape Tanks?

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Originally Posted by Pete17C View Post
I was looking at these but I see problems.

It looks like they get really tall in the middle when full. Also looks like they carrry a lot of height to the edges.

And I'm not sure how they work all bunched up in a parabola instead of on a flat surface like they are designed to be on.

Finally, I'm picturing them breaking my cabin sole supports as I fill them.

Just not at all sure of these. Need about 40-50 gallons per tank in 2 tanks.

I was looking at building the tanks in as integral tanks but am not entirely sold on the leaching of BPA and amines (if epoxy) or styrene (if polyester).

That basically leaves the NSF guideline meeting polyethylene tanks.

Definitely open to all suggestions including bladder tanks that are more appropriately shaped for the space.
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Old 06-12-2018, 07:38   #5
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Re: Source for Parabolic Shape Tanks?

Googling Ronco I found this place.

Boat and RV water, Waste holding Tanks
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Old 06-12-2018, 07:56   #6
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Re: Source for Parabolic Shape Tanks?

Polyethylene tanks are roto-molded and require expensive tooling (mold) to be made. This generally makes custom tanks cost-prohibitive.

A custom bladder will also be quite expensive. A bladder would also likely preclude using a deck fill plate, as they are generally not designed for the additional pressure head from the height of the fill line.
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Old 06-12-2018, 07:58   #7
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Re: Source for Parabolic Shape Tanks?

Try https://ronco-plastics.com
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Old 06-12-2018, 08:30   #8
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Re: Source for Parabolic Shape Tanks?

Google "food grade epoxy"
Lots of them out there.
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Old 06-12-2018, 08:41   #9
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Re: Source for Parabolic Shape Tanks?

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Google "food grade epoxy"
Lots of them out there.
Given that just being in the presence of epoxy dust that has been cured for years puts me into a two-day allergic attack, I'm not willing to risk drinking hardener
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Old 06-12-2018, 11:12   #10
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Re: Source for Parabolic Shape Tanks?

Better yet.... Ronco Plastics marine Tanks

They make TOP quality thick-walled water and waste tanks for a very reasonable price and have more than 400 shapes and sizes, over 100 of which are non-rectangular, and they install fittings in the sizes and locations specified by the customer when they make the tank.

As you look at the drawings, keep in mind that because there is no top or bottom until the fittings go in--and you decide where they go--they can be oriented any direction. So rotate, flip end for end, try 'em in any orientation.

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Old 06-12-2018, 12:10   #11
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Re: Source for Parabolic Shape Tanks?

Quote:
Originally Posted by Chotu View Post
Hi,
I've been looking all over for polyethylene water tanks shaped like my bilge.

My bilge is a parabola where a is 12" and b is 40".



The flat top of the parabola is my cabin sole.

Where do you get tanks shaped like this or custom tanks built like this?

The third dimension is about 52" .
If you are going to remove the sole anyway. I would just skin the hull with iso plus glass and glass tag in baffles. I doubt you will find a premade tank to fit your need other than a bladder..
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Old 06-12-2018, 12:23   #12
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Re: Source for Parabolic Shape Tanks?

There are also custom made plastic tanks. That is what I am having done.
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Old 06-12-2018, 12:34   #13
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Re: Source for Parabolic Shape Tanks?

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Originally Posted by mitiempo View Post
There are also custom made plastic tanks. That is what I am having done.

Triple M Plastics in Maine is a top quality custom tank builder. Triple M Plastic Products Inc


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Old 06-12-2018, 16:23   #14
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Re: Source for Parabolic Shape Tanks?

Id talk to Aero Tec Laboratories. They custom make fuel and water bladders. Im sure they could do that shape.
Aero Tec Laboratories - BoatBladders.com - Marine Fuel Bladder Tanks - Range Extender Fuel Bladders - Petro-Flex Fuel Bladders - FueLocker Fuel Bladders - Below Deck Fuel Bladders - OEM Fuel Bladder Tanks - Replacement Fuel Tanks
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Old 06-12-2018, 17:05   #15
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Re: Source for Parabolic Shape Tanks?

You could probably get stainless steel tanks made to this pattern from a local fabricator. Does depend on where you are.
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