Looking to use propane tank either two 20lb or one 40lb tanks as air
tanks?

I'll get new empty tanks FYI if this is doable. I hear they're
supposed to hold up to 300 PSI test as part of requirement as propane
tanks?

Cheers,

Wizard
If you are buying new, why not buy air tanks?


Ron Thompson
On the Beautiful Florida Space Coast, right beside the Kennedy Space Center, USA

http://www.plansandprojects.com

The ultimate result of shielding men from the effects of folly is
to fill the world with fools.
--Herbert Spencer, English Philosopher (1820-1903)