Two complete electrical power generating stations are to be supplied by Siemens Energy to offshore drilling rigs in Yantai, China.

Siemens’ “closed ring solution” has been selected to power the 7th generation semi-submersible drilling rigs at the Chinese shipyard Yantai CIMC Raffles Offshore.

The Frigstad D90™ design are under construction Ltd in Yantai, China. Delivery of the first drilling rig to Frigstad Deepwater Ltd. is scheduled for December 2015. The second unit is to be delivered six months later. The order also includes an option for equipping a further four drilling rigs with power supply systems over the next four years.

Siemens’ scope of supply includes the entire power supply systems, each consisting of medium-voltage switchgear, transformers, drilling-drives, low voltage switchgear, variable frequency drives (VFD) and a power supply system for dynamic positioning (closed ring DP3), which enhances flexibility and streamlines the power management system of the rig.

The rig owner Frigstad Deepwater Ltd. has stipulated that the rig’s power plant must be able to operate with closed ring in the various DP modes in order to enhance operating flexibility, increase fuel efficiency and reduce emissions, and has worked together with Siemens and the rig designer Frigstad Engineering to achieve this goal. 

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