Russ-D >
You sure know you air systems.
Thanks for further explaining things.
About taking the already compressed air from the primary tank I already explained is not feasible it would be a waste. It would be the same as connecting the output into the inlet of a compressor and turning it on
About a second tank that is compressed then fed would work but you would need (2) of similar size compressors feeding that tank that feeds the primary compressor so would cost a lot to make practical.
For anyone with more questions my E-mail is
djd@landisusa.com my AOL is