Their rotating speed is 2850 r/min, rated frequency is 50 HZ. Pump lifting distance, inhaling distance, flux of series water pump refers to maximal applicable range. Because the same power, set tube diameter, distance from water and transimtting distance influence maximal capability. Detailed data are on nameplate. (1.5 meters lifting and inhaling distance loss per 10 meters pipeline.) Lifting distance includes inhaling distance. Please use above 7.5 meters pipe as infalling one, if inhaling distance is over 7 meters.