1. Calculate the outer cylinder volume:

Radius = 14.5in

Height = 60in

outerVolume = 39 631.191325 cubic inches

2. Calculate the inner cylinder volume:

Radius = 14.5 - 3/8 = 14.5 - 0.375 = 14.125

Height = 60 - 3/8(top) - 3/8 (bottom) = 60 - 0.75 = 59.25

innerVolume = 37 137.71169 cubic inches

Note: I've used this cylinder volume calculator:

http://www.aqua-calc.com/calculate/volume-cylinder3. The stainless steel frame volume is equal to:

(!) stainlessSteelVolume = outerVolume - innerVolume = 39631.191325 - 37137.71169 = 2493.479635 cubic inches

3. We have to convert your stainless steel density (15.30 lbs per sq.ft per 3/8") to density in lbs per cubic inch:

3.a) 1 sq.ft = 144 square inches (

http://www.aqua-calc.com/one-to-all/area)

3.b) Density = 15.30 lbs per 144 square inches per 3/8 inch = (*** multiply by 8 ***) = 122 lbs per 144 square inches per 3 inch = 122/144/3 lbs per cubic inch = 0.28241 lbs per cubic inch (!!).

Note: The calculated 0.28241 lbs per cubic inch for your steel is corresponds to average steel density (0.285406) as reported by aqua-calc.com here:

http://www.aqua-calc.com/page/density-table/substance/steel4. Finally, we can calculate the stainless steel frame weight:

4.a) The volume of your stainless steel frame is equal to 2493.479635 cubic inches (!)

4.b) The stainless steel density is equal to 0.28241 lbs per cubic inch (!!)

Weight = Density * Volume = 0.28241 lbs/cubic inch * 2493.479635 cubic inches = 704.18358372035 lbs

Please, double check and validate all these results before actual construction.

I hope these calculations are helpful.