In mid 2007 Hydrafit Subsea UK Ltd visualised a DW IWOCS and discussions commenced on this concept and how we could make our system unique .We consulted with OEMs and operators with regard to their requirements for a DW IWOCS, we commenced design of our system in early 2008 and completion is scheduled for end second quarter 2009.

We have designed a Subsea Deepwater Control System suitable for both the installation and recovery of xmas trees and also to carry out workovers. Our system has the capability to be deployed via guide wires or within a Subsea basket and is designed to operate in water depths from 153m (500ft) up to 3000m (9,850ft).

System design

Our system has been designed to the latest standards, featuring light weight materials, small footprint, reduced mobilisation times and high accessibility to minimise service downtime. It has innovative software and hardware to make the system the safest and lowest response time, electro-hydraulic deep water system available.

A state-of-the-art control system which Hydrafit Subsea has developed in partnership with Zetechtics will operate the system. The Jupiter system software package has a user-friendly feel, designed such that the system may be monitored remotely via an Ethernet interface and it's easily customised to interface with ROVs, lights, cameras and any other configurable units.

The software is configured to individual customer requirements with interlocks installed to prevent inadvertent operation of functions and incorrect operational sequences. Secure access to the system is controlled by operator passwords and all operations carried out are recorded and stored within the system. The stored data can be customised to suit individual client's requirements.

The surface equipment is based on a Main Control Unit (MCU) which incorporates the hydraulic power unit and a Main Control Panel (MCP) which houses two off 19" racks for the storage of all electrical components and an operator's terminal station.

The system also includes two umbilical reelers situated topside, the first transfer's hydraulic pressure from MCU to the SCU, and the second transfers power and communications from MCP to SCU. A Local Control Station (LCP) is located within the drillers' cabin. Control of the SCU may either be carried out from the MCP or the LCP. However to allow functionality of the LCP, control must be switched over from within the MCP. A UPS system is installed within the MCP to provide a power back up to critical systems in the event of a power failure on board the vessel, allowing time for the closure of the Subsea Xmas tree in a controlled manner.

Technical specification

• Surface equipment
• Main Control Unit (MCU)
• Main Control Panel (MCP)
• 2 off 19" Racks
• Operator's terminal station
• 2 umbilical reelers
• Local Control Station (LCP)
• Drillers' cabin
• UPS
• SCU
• PLC/PC based system
• Emergency release system (ESD)
• Subsea Control Module (SCM).
• Termination points will be provided within the MCP for the SCM monitor
• Subsea Control Unit (SCU)
• Subsea hardware package.