Northern Drilling’s West Mira is the primary rig in operation to be awarded the DNV GL Battery (Power) class notation. West Mira is an ultra-deepwater semi-submersible designed by Moss Maritime, working a hybrid energy plant utilizing Lithium-ion batteries as spinning reserve in dynamic positioning (DP) operations and to provide energy throughout peak load occasions.
“With the Battery (Power) class notation, we’re serving to our prospects within the offshore trade benefit from new applied sciences for safer, extra energy-efficient and environmentally pleasant operations,” says Geir Fuglerud, Director of Offshore Classification at DNV GL. “Hybrid and totally electrical battery options have already been put in in virtually 200 marine vessels globally. We are actually seeing offshore rigs stepping as much as benefit from these power storage techniques, with a number of extra rigs quickly to observe West Mira.”
Installation and testing of the power storage system have been accomplished with shut cooperation between Seadrill/Northern Drilling, Siemens, Kongsberg Maritime and DNV GL. By utilizing the 4 converter-battery techniques, the operator estimates will probably be in a position to cut back the runtime of the rig’s on-platform diesel engines by 42 %, reducing CO2 emissions by 15 % and NOx emissions by 12 %. The system will even function back-up to forestall blackout conditions and supply energy to the thrusters within the unlikely occasion of lack of all working equipment on affected switchboard segments.
The Battery class notation applies to Li-on batteries of >20 kWh put in on board DNV GL classed vessels and offshore rigs and builds on DNV GL’s guidelines for the set up and use of Li-on batteries. DNV GL has additionally up to date its guidelines for dynamic positioning to incorporate batteries as a “spinning reserve”, a redundant energy supply for dynamically positioned vessels designed to fulfil IMO tools class 2 or three for vessels with DP techniques.
Seadrill is managing the West Mira on behalf of Northern Drilling. The semi-submersible has now left Bergen, Norway, and is heading for operations on the Nova Field within the North Sea.
(Source and picture: DNV GL)

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