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To: techdiver@opal.com
Subject: tight fills/AL80s
From: "Hugh A. Huntzinger" (CCAC-LAD) <huntzing@PI*.AR*.MI*>
Date: Tue, 1 Mar 94 8:32:40 EST

John asks:
> ...whereas others, e.g., Al 80s, have a significantly smaller safety
> margin.  If anyone has concrete information on the safety margin for
> common tanks, it would make an interesting posting.

I had made some inquiries and the Manufacturers are very tight lipped
about specifics.  From some rough analysis I have done, I found that
Al-80s are extremely unsuitable for overfills - the Alloy has fatigue and
temperature concerns:  'book' values predict that temperatures AS LOW AS
100F (!) cause measurable (and significant) reductions in design strength.

Please...just buy a Genesis rather than pump up an Al 80.  The "time
until payback" is tiny...something like only 50 fills.  AND its much safer.

-hugh

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