DP Add-on
Upgrading an existing drilling unit to a Dynamic Positioned Deepwater Drilling Unit is preferably carried out with the GVA DP ADD-ON system where four new prefabricated "corners" are added to the hull.
Benefits include:
- Feasible for all 2:nd and higher generation units, including designs such as Aker H-3, PaceSetter, Sedco 600 & 700 series, GVA designs, etc.
- Minimum tie-up of rig at yard
- All DP-related power and propulsion in new structures
- Minimum of interface to existing systems
- Increased deck load capability
- Four independent machinery spaces and hence no additional cost for compliance with DP 3 rules and regulations
Typical particulars for a DP-upgraded Unit:
- Water-depth up to 5,000-7,500 ft
- Deck and column payload, 4-5,000 tonnes
- Total payload, transit 4-5,000 tonnes
- Particulars dependent on size of existing unit
Minimum tie-up of rig at yard:
- For pre-fabrication of new “corners” and for long-lead items 10-12 months is required
- During pre-fabrication the rig can be on charter
- Attachment of pre-fabricated corners and the drilling system upgrade require the rig 3-6 months at yard
- Total conversion time 14-18 months, depending on selected yard