GPM Home › Forums › Public Forums › General Plumbing › GPM This topic has 1 reply, 2 voices, and was last updated 24 years, 9 months ago by Scott Bryan. Viewing 1 reply thread Author Posts 8 Mar 2000 at 5:55 pm #272605 MasterPlumbersKeymaster AT 60 PSI STREET PRESSURE HOW MANY GPMWILL FLOW THRU A 1/2″ COPPER PIPE 8 Mar 2000 at 11:05 pm #286005 Scott BryanParticipant It depends on the length of the run of copper tubing but here are 2 examples. 60psi in 100′ run of 1/2 copper = 7GPM 60psi in 35′ run of 1/2 copper = 11.5GPM I hope this helps Scotthttp://www.plumbingpartsdepot.com Author Posts Viewing 1 reply thread You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In