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FYI: This is for a 72" sphere with 1.25" thick material. Where
this may differ from Jon's calculation is that the Usage Factor,
eta, used in this program is 0.67 as specified by ABS. Jon
apparently used 0.8, which increases conservatism.<br>
<br>
Sean<br>
<br>
<br>
<img src="cid:part1.00000904.03020607@telus.net" alt="">
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