Reply To: Pipeline Of Pump Home › Forums › Petro Solutions Forum › Engineering Students › Pipeline Of Pump › Reply To: Pipeline Of Pump August 17, 2021 at 7:45 am #1656 Nasir HussainKeymaster The diameter of the suction pipe is always greater than discharge in pumps and compressors. It is because the kinetic energy provided by the machine is converted to pressure energy due to the low diameter of the pipeline.