"Steve B" wrote in message
...
I'm interested in building a surface supplied air compressor for two
divers. 22 cfm@150 psi. I know that the big difference is vegetable oil
in the crankcase vs. petroleum based oil, but just wondering if anyone had
any experience with this. A new one especially made for diving is going
to run about $7500, and one could be put together from components for
less, provided the air generating part is compatible with breathing air.

Anyone?

Steve

I think product liability insurance will be the largest part of the cost.

From a practical standpoint do you think it will need an air cooler?
Possibly a submerged "radiator" of some kind?