water flow thru main line 3/4 pex. Have a new 5/8 meter flowing 28 gpm at house side of meter, proptery goes up a 10 ft incline to house.Click to see full answer. Furthermore, how many GPM is 3/4 PEX? Pressure Drop Table (psi per 100ft of tubing length) Flow rate, GPM PEX tubing size 1/2″ 3/4″ 0.5 0.51 0.05 1.0 1.70 0.34 2.0 5.30 1.02 how many GPM can a 3/4 copper pipe flow? Water Flow (GPM/GPH) based on Pipe Size and Inside/Outside Diameters Assume Average Pressure (20-100PSI). About 12 f/s flow velocity Pipe Size (Sch. 40) I.D. (range) GPM (w/ min. PSI loss & noise) 1/2″ 0.5 – 0.6″ 14 3/4″ 0.75 – 0.85″ 23 1″ 1 – 1.03″ 37 Secondly, how many GPM will a 3/4 pipe flow? Metric PVC Pipe Assume Average Pressure. (20-100PSI) About 12f/s flow velocity 1/2″ .50-.60″ 14 gpm 3/4″ .75-.85″ 23 gpm 1″ 1.00-1.03″ 37 gpm 1.25″ 1.25-1.36″ 62 gpm How many GPM is 60 psi? 2.2 GPM