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Old 01-16-2013, 02:19 AM   #41
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City: Mooloolaba
Vessel Name: Flora
Vessel Model: Timber southern cray boat
Join Date: Oct 2007
Posts: 1,854
I'm not saying for a given size it is lighter but the weight difference is minimised due to the scantlings.
"When I die I hope my wife doesn't sell my toys for what I told her I paid for them"
Money: It's made round to go round , not flat to stack.
"Get out and do it"
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Old 01-16-2013, 03:33 AM   #42
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City: Erie PA
Vessel Name: Endless Endeavor
Vessel Model: Custom
Join Date: Dec 2012
Posts: 225
I have two 120 gallon AL tanks the boat is 27 years old no problems.
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Old 01-16-2013, 08:23 AM   #43
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City: Missourah
Vessel Name: M/V Scout
Vessel Model: Sundowner Tug 30'
Join Date: Jul 2010
Posts: 645
Saying aluminum is like saying plastic.
There are many different aluminum alloys that are suitable for different applications and have different welding characteristics.
Some of the bi-metal alloys can/will have a galvanic reaction when submersed in water over a period of time. Some not so much.
There are 'marine grade' alloys that would be suitable and last a long time.
Others can debate the health issues.

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Old 01-16-2013, 10:55 AM   #44
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City: Vallejo, California
Vessel Name: Mahalo Moi
Vessel Model: 1986 Grand Banks 42 Classic
Join Date: Jun 2008
Posts: 2,064
I stated early in this thread that we have aluminum tanks. They are 26 years old and doing fine. We don't drink the water because the dissolved aluminum concentrations exceed National Drinking Water Standards for safe consumption. We choose to error on the side of caution. Read RT's highlighted article which he posted after my first post.

Should our tanks fail in the future, I will replace them with polyethylene or properly welded SS.
"Mahalo Moi"
1986 GB-42 Classic
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Old 01-16-2013, 11:23 AM   #45
City: Carefree, Arizona
Vessel Name: sunchaser V
Vessel Model: DeFever 48
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Posts: 9,421
Page 118 in the September 2012 PM magazine has an article by Steve D'Antonio on this subject. He doesn't recommend Al due to galvanic, pitting and poutice corrosion. His first choices are SS and FRP. Love him or not, here is what he says as a wrap up:

"While aluminum is an ideal material for many boat building and marine applications, its reliability for potable and black water tank use is less than ideal."
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