Riser joint consists of a pipe member mid section, with riser connectors at each end. These joints are typically provided in 30 ft. to 50 ft. lengths. The riser joint, which houses the pump can be located anywhere in the riser section depending on water depth, formation pore pressure typically 200 - 300 m below the sea level. The system also allows the bottom hole pressure to be quickly adjusted by simply adjusting the air/mud level above the pump outlet in the marine-drilling riser.