Free Flow Pumping Rate The delivery rate of fluid at the outlet of a product pump when there is no backpressure present. The free flow pumping rate is typically stated in gallons per minute (gpm). Also known as “free flow.” See also PEI/RP700. By rhys|2014-10-16T15:48:25+00:00October 16th, 2014|Comments Off on Free Flow Pumping Rate Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkXingEmail About the Author: rhys