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> Date:          26 Aug 1997 08:53 EDT
> To:            techdiver@aquanaut.com
> From:          "David Pearson" <dpearson@no*.ca*>
> Subject:       Tank Band Isolation

     David,
         It is a good idea to put an insulator between tank bands and 
tanks. The reason for this is most double tank bands are made out of 
stainless steel and will react with the tank. When stainless steel bands 
are put on aluminium tanks, electrolysis occurs between the stainless 
steel and the aluminium when they are in the water. The aluminium
 will sacrifice itself and start to pit under the stainless steel bands. 
This is the same thing as a zinc on a stainless steel boat shaft. The 
zinc being a softer metal, sacrifices itself to save the stainless 
steel shaft. On steel tanks the paint helps to prolong the life of 
the galvanize ( zinc ). Stainless steel band invariably nick the 
paint and act as a conductor to the electrolysis and wear down the 
galvanized coating faster. The easiest way to prevent this is to put 
a layer of electrical tape or duct tape on the inside of your bands 
before installing them on your tanks. The tape will act as an 
insulator between the bands and your tanks.

      Ted

> Folks
> 
> I remember some discussion about this around a year ago, but the archives are
> only coughing up one or two months back.  I was thinking of cutting a band
> of inner-tube to slip between the tanks and the bands.  But, the more I
analyze
> it, the more uncertain I become.
> 
> Should tank bands be isolated from the tanks?
> If no, why not?
> If yes, why and how?
> 
> thanks
> David Pearson                      
> --
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> 
Ted Green (owner)                
Tidewater Aquatics (Dive Store)  
Salisbury Maryland USA
TDI IT #029
SSI MI #178

The world contains but three types of people:
            1. Those who make things happen.
            2. Those who watch things happen.
            3. Those who wonder what happened.
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