The Diverter Control Unit is a free standing, seam-welded, skid unit that provides an easy access point to function the Diverter.
It is designed to preclude the Diverter from closing-in the well. This requires opening one or more vent lines, as well as, closing normally open mud system valves (if applicable) prior to closing the diverter annular sealing device. Operation to open the vent valve and close the mud line (return) valve shall occur before the Diverter Packer is closed.
The design of the system software is to prohibit closing the diverter packer unless a vent line has been opened. If the diverter in use is equipped with an insert packer and/or pressure energized flow line seals, the control system sequencing circuitry shall additionally prevent closing the diverter packer if the insert packer is unlocked or if the flow line seals and/or overshot packer are not energized.
Where applicable, the control system shall be capable of switching the diverted flow from one vent line to the other (e.g., port to starboard) while the diverter packer is closed without shutting in the well.
Key Features
- Operating the system is carried out at local Operator panel or the various HMI Panels (MCS, DCP, and TCP). The PDU provides the electrical supply, the HPU & RMU provide the hydraulic supply, and the pneumatic supply comes from rig supplied air.
- Manipulator Valves provide a means to manually function the Diverter from a local panel, should communication were to be lost.
- Gauges are used to visually monitor the system pressure and Needle Valves are used to isolate a circuit for servicing, push buttons control the pressure of the regulated circuits, and Block & Bleed Valves provide a safe means to perform maintenance on the system.
