For that length of run, I would use 3/4 pipe up to the t and then across the shop--then the 1/2 is OK--at the end of a long run when you trigger a grinder or heavy tool the immediate drod is slow to recover a mile from the compressor--and like has already been said---slope the intial run of pipe so it goes uphill away from compressor and the as the air cools and the moisture condenses it will drain back into the main tank where you can easily drain it off--