The present Reciprocating Pump Test Rig is a self-contained unit operated on closed circuit basis containing a sump tank. The set-up consists of a Double acting, Single Cylinder Reciprocating Pump coupled with a DC Motor. Motor is controlled by computer signal to vary the RPM of motor. RPM of the pump is measured by Proximity sensor. Flow of water is measured by Flow Sensor, pressure is measured by Pressure Sensor and Vacuum is measured by Vacuum Sensor. This unit is capable to study the characteristics of Reciprocating Pump. The instrumentation done enables the user to study the same with ease.