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  #1   IP: 100.33.74.232
Old 11-27-2018, 03:00 PM
azazzera azazzera is offline
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Need collective wisdom

I’m installing a water tank under v-birth. Want to know if one demention of tank is better over another. I’ve decided on one of two tanks that will fit in the space I have. My question, is one of these two tanks better with regards to stability. There are no baffling in the tanks so I’m thinking about water moving in the tanks. The squarer of the two is 22 gallons, 23x16.875x14.75. The flatter one is 20 gallons 33.25x17.125x8.75. Hope the pictures loaded. For a 73-72 Pearson 30. Any advice on instillation, tips ,tricks ,appreciated. Thank you.
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  #2   IP: 172.95.97.58
Old 11-27-2018, 03:11 PM
Dave Neptune Dave Neptune is online now
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As the two tanks are very close in size my consideration would be which tanks leaves me with the most storage space / access.

The sloshing in a 30 footer should be no threat to safety if well mounted.

Dave Neptune
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  #3   IP: 137.103.82.194
Old 11-27-2018, 10:43 PM
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joe_db joe_db is online now
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The term is "free surface effect" and can be quite dangerous - in a much bigger tank. My bow tank is about twice that size and has one baffle.
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  #4   IP: 24.152.132.140
Old 11-27-2018, 10:49 PM
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ndutton ndutton is offline
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Why no baffle?
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  #5   IP: 32.211.28.40
Old 11-27-2018, 11:21 PM
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Al Schober Al Schober is offline
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I'm thinking the 33" tank needs a baffle IF the 33" dimension is fore/aft.
Please design access to the tank so you can get in and clean into the corners. Don't rely on Clorox to keep the tank clean. All you need is one fill-up from untreated well water, and you'll have swimmers in your tank.
How are you building this tank? I know of one fellow that just fiberglassed over the cardboard, then let the cardboard dissolve. I DON'T recommend it. The inside of the tank wants a smooth surface for easy cleaning and coating with an NSF approved tank coating (no fiberglass taste). Make sure there's an outlet/drain from the low point in the tank.
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  #6   IP: 73.212.47.219
Old 11-28-2018, 05:51 AM
sdemore sdemore is offline
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If you are building it, watch the material you build it from. Most epoxy isn't potable water compatible and will leach toxins into the drinking water. West Systems told me that if the epoxy produces an amine blush, it will leach those amines into the water as well. If you do use their epoxy, you mix it significantly richer in resin and use less hardener. I did find one manufacturer that said theirs was FDA compliant, but they have now relabeled their product from Marine Epoxy to Table Top Epoxy. Same product, but marketed to a different audience now.
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Last edited by sdemore; 11-28-2018 at 05:54 AM.
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