Enhanced Reliability Drillship

Improved power system function and performance to fulfill new marine class requirements

Posted on June 20, 2013

ABB, a power and automation technology group, has secured an offshore marine industry contract covering electrical power and propulsion systems onboard a DP class 3 drillship to be conferred with ‘Enhanced Reliability’ and DYNPOS AUTRO notation from Det Norske Veritas (DNV).

The contract covers installations onboard a BT-UDS dynamic positioned, ultra-deep water drillship ordered by Sigma Drilling – the joint venture between Norway’s Skeie Technology and Houston, Texas, U.S.A.-based Vantage Drilling – from STX Offshore & Shipbuilding. The vessel is to be built at South Korea’s STX Jinhae yard and is scheduled for delivery in the second half of 2015.

The BT-UDS is a drillship design developed by Bassoe Technology and will be capable of drilling wells down to 12 190 m in water depths of 3650 m. Six azimuthing thrusters, combined with the Bassoe-developed hull form, will provide a transit speed up to 16 knots.

The new DYNPOS ER class notation for Enhanced Reliability from DNV recognizes advances made in flexibility, redundancy and fuel-efficiency in the structuring of DP systems. The notation covers connected power systems with standby start-up capabilities in specific conditions and the seamless and redundant change-over of generators and thrusters via closed bus ties. DYNPOS ER also has specific requirements for operational flexibility and the safe operation of the power and thruster plant onboard. 

To meet DYNPOS ER and the DYNPOS AUTRO with closed ring requirements, ABB said the Sigma Drilling ship will feature its most advanced protection devices: fast bus communications based on IEC 61850 standards; and integrated blackout prevention functions.

ABB will supply a comprehensive package of power and propulsion plant, and preventive onboard maintenance systems including generator sets, switchboards, thruster motors, thruster drives, the drilling drive systems, diesel generator monitoring system (DGMS) and remote diagnostic system (RDS).