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Old 01-16-2013, 02:19 AM   #41
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Marin,
I'm not saying for a given size it is lighter but the weight difference is minimised due to the scantlings.
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Old 01-16-2013, 03:33 AM   #42
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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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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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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.
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Old 01-16-2013, 11:23 AM   #45
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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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