Flow rates indicated on chart were determined by pumping water. For optimum life and performance, pumps should be specified so that daily operation parameters will fall in the center of the pump performance curve. Example: To pump 22.7 lpm (6.0 gpm) against a discharge pressure head of 2.7 bar (40 psig) requires 4 bar (60 psig) and 10.2 Nm3 /h (6 scfm) air consumption. (See dot on chart). Caution: Do not exceed 8.6 bar (125 psig) air supply pressure.