There is friction loss when air moves through pipes (same as water), so by the time the air gets to the heads your not at 110psi. Also your mainline will not shoot up to 110 psi in 5 sec, just as your tire does not inflate to 60-70psi in 5 sec when you air it up. There is a lot of volume in a 1 1/4 in mainline that needs to be pressurized.
This all being said, I am based in TX. What is a blowout? hahaha
Last edited by txirrigation; 10-16-2012 at 10:13 AM.