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The Songa Dee Special Periodic Survey. Image courtesy of Semco Maritime.

The Songa Dee Special Periodic Survey rig, owned by Norway-based Songa Offshore, suffered an engine failure Monday during a scheduled yard stay in Scotland.

The Songa Dee experienced “unexpected failure” in one of its four main engines, Songa Offshore said.

Critical parts for the engine are currently being prepared for re-installation.

The rig is expected to leave Invergordon, Scotland on November 7 and should be back on day rate a few days later.

The costs related to the failure will be claimed against insurance and are not expected to increase the overall yard stay costs beyond the previous budget.

During the yard stay the rig won certification for its hull and structure by the Det Norske Veritas, an international vessel classification society.

The vessel’s blowout preventer (BOP) was also overhauled and lifted back on board.

Commissioning of the BOP and winch upgrades are in the final stages.

The $90 million work plan for the rig has progressed according to plan and is currently on time and on budget, Songa Offshore said.