Andrew I got the formulas from this website
http://sti.srs.gov/fulltext/fulltext-1998.htm
The name of the document was Heat Transfer Model of Above and Underground Insulated Piping Systems
I look for it but I couldn't find it you will probably have to ask them about it.
Good luck
Guys...thanks a lot for all the input...it really helps.
Denniskb...what analysis did you use to get the answers...did you use any of the spreadsheets that you have on your website...if you did..please tell me which one.
Have a good day.
Thanks Tremolo for your quick response...
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