The Pumping Unit is designed to be installed in the Mobile Workstation. It contains a motor-pump assembly, a reservoir, and a disconnecting switch. The pump is connected to the reservoir via a strainer, ball valve, and pressure measurement point. The pump is controlled by a Start/Stop push-button station protected by a disconnecting switch with lockout/tagout devices. The Pumping Unit and the Mobile Workstation form a stand-alone pumping system that is used to test the piping circuits for leaks.