Riser check valve is a compact and rugged swing-type unit that allows water flow in one direction and prevents flow in the opposite direction. This valve is designed to minimize water hammer caused by flow reversal. It is mainly designed for use in the risers of wet type fire protection systems. The single clapper design features dual springs for non-slamming operation and the streamlined body and wide-open clapper design provide for low friction loss. This valve can be installed in the vertical or horizontal position and the EPDM rubber faced clapper provides a non-stick leak-tight seal.
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.
Riserless light well intervention system plays an important role in increasing oil recovery from subsea wells. It includes a patented lubricator system with a recirculation of hydrocarbons into the well. The system is deployed through a moon pool from a dynamically positioned vessel, installed on the subsea christmas tree without the use of anchors or risers.