World’s Largest Semi-Sub Rig Ready to Drill

Published at 08:32AM - 09/08/16

DNV GL announced it has finally welcomed Ocean Greatwhite, the world’s largest semi-submersible drilling rig, into class.

The rig, owned by offshore drilling contractor Diamond Offshore, was delivered at Hyundai Heavy Industries (HHI) in South Korea. It will be chartered to BP to operate in the Great Australian Bight.

“The Ocean GreatWhite is a unique rig purposely built for drilling in harsh environments,” Diamond Offshore SVP Technical Services, Karl Sellers, said.

World’s Largest Semi-Sub Rig Ready to Drill

Ocean Greatwhite is approximately 403.5 feet long and 255.9 feet wide and is the first MOSS CS60E and largest rig in the world.

It is also the first new-build rig to receive the DNV GL Integrated Software Dependent Systems (ISDS) notation.

These are systems whose performance is dependent on the overall behaviour of their integrated software components, helping owners and operators minimise integration errors and delays in projects.

This certification represents a new approach to verification, the company explains, as it emphasizes a review of the working methods and processes that lead to delivery, rather than focusing on the final review to ensure product requirements are met.

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“We have a strong relationship with both DNV GL and Diamond Offshore – and it is thanks to this good cooperation that the project went so well. We are proud to deliver the first drilling ship of this size and look forward to many more projects on this scale,” HHI Senior Executive Vice President, Youngseuk Han, said.

“We will keep moving the boundaries of technology by completing following large-scale and innovative projects,” he added.

According to DNV GL’s Vice President and Regional Director, Paal Johansen, Ocean Greatwhite is capable of operating in depths of up to 9,842 feet and drill down to a depth of 35,006 feet.

“It represents the state of the art in the semi-submersible sector and we are very pleased to have been asked to contribute our expertise to this project,” he said.