About the asset: The Bruce complex is located 340km to the northeast of Aberdeen in the Northern North Sea.

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The Bruce complex consists of three bridge-linked platforms:

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• A Production Utilities Quarters Platform with quarters for crew (max. 168 persons);
• A Drilling Platform; and
• A Compression/Reception Platform which hosts reception and compression facilities.

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The subsea Keith and Rhum fields are both tied back to the Bruce complex where they are transported and processed for export. Gas is exported via the Frigg pipeline to the St Fergus terminal and liquids are exported via the Forties Pipeline System.

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Katoni's role in supporting the client: Katoni provided the design and managed the installation of a temporary diesel generation solution to Serica Energy to reduce carbon emissions during turnaround (TAR) periods. The generation package shown in the 3D model below was specified by Katoni along with platform tie-ins (fuel, electrical and safety systems) and grillage to provide the simplest and safest installation of the package.

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With the diesel generation package installed it is estimated that approx. £1.8 million in Fuel and Emissions Trading Scheme (ETS) costs savings were provided compared to running GTGs on liquid fuel during the 50 day TAR period corresponding to a CO² reduction of 5,500 tonnes.

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The Temporary Generation solution includes the following:

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• 3 × Diesel Generators - 1.25 MVA per generator,
• 1 x LV/HV 4MVA Transformer,
• 1 × Neutral Earthing Resistor (NER).
• 1 × permanent HV Junction Box (on handrail) to interface with platform Power network.

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The solution has the following key technical and integration features:

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• Fuelling was configured from the Diesel supply ring using and Auton Fill system which managed the diesel supply and overflow.
• The bespoke grillage that the equipment was mounted
  on afforded cable / hose apertures to keep tidy and avoid any trips while also including normal service lighting
  as well as escape lighting as appropriate. It was designed to provide the requisite maintenance access for all equipment.

• At 75% utilisation the generation sets used approx. 199 tr / hour.
• Generator common alarms at CCR.
• Full ESD tie in to provide dedicated shutdown at appropriate levels for temporary generation.
• Managed synchronised change over to allow seamless transfer of power from main generation to temporary generation and back without the need to blackout the platform.

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Understanding the client's needs & delivery:

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The project aim is to reduce emissions released during TAR periods. The Gas Turbine generators are known to be inefficient when run at a reduced load while on liquid fuel. This has been the traditional operating philosophy during TAR periods when fuel gas wasn't available. Diesel engine generator sets rated for the anticipated TAR loads are known to be more efficient in terms of liquid fuel used and emissions released than the Gas Turbine Generators for the given load profile. Katoni delivered an installation design which includes permanent infrastructure to allow the quick installation of a Temporary Power Generation package. It is intended that temporary power generation will be used during TAR periods when typically, the existing GTGs would have been run on liquid fuel. Due to the inefficient nature of the GTGs operating at a reduced load on liquid fuel, power generation using traditional diesel generators is more efficient and reduces emissions.

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DATE OF COMPLETION: July 2023

PROJECT PHASE: FEED, Define, and Execute

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