Spring 2019

Complex dive task completed for Premier Oil

James Fisher Marine Services (JFMS) has been working closely with Premier Oil on a complex diving job in the Balmoral field off the coast of Aberdeen.

The JFMS team was tasked with providing a specialist nitrox diving spread to be launched via a gravity-based launch and recovery system installed on Premier Oil’s Balmoral floating production vessel.

Nitrox diving

Although the JFMS team already performs nitrox diving campaigns (a system which allows divers to spend longer underwater without risk of decompression illness) in the region, this was the first mission to be carried out directly from a client’s offshore production facility – through the platform’s moonpool.

This demands the installation of a gravity-based launch and recovery system (LARS) on to the platform – something JFMS has championed for both diving and ROV operations in the North Sea.

According to JFMS business development manager, Bob Atkinson this method of delivery offers significant cost and operational efficiencies over using a dedicated diving support vessel and the team is talking to other oil companies about similar work in the future.

Commendation from Premier Oil

Premier Oil’s subsea operations manager singled out the efficiency of the JFMS dive team for commendation.

18 divers worked in rotating shifts at depths of 28m to replace 45 sacrificial anodes situated under the platform’s pontoons. Each anode measured approximately is 1m by 75mm by 150mm in size and weighs 56kg so in order to make handling them easier, the JFMS team created a bespoke designed buoyancy installation frame which could support each anode under the water.

JFMS also provided an onshore project management and engineering support team made up of combined resources from its dedicated offshore and subsea operational bases in Lowestoft and Oldmeldrum, Aberdeenshire. In total, 30 offshore personnel comprising supervisors, divers, inspectors and engineers worked on the project.

Further information 

Read the original press release: JFMS completes major air/nitrox diving project in the Central North Sea.

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