Britannia Map

Britannia is one of the largest natural gas and condensate fields in the North Sea processing oil, condensate and gas from the Britannia, Brodgar, Callanish, Enochdhu and Alder fields. (Finlaggan Field (Zennor operated) to be tied-in during 2021). Condensate is delivered through the Forties Pipeline to the oil stabilisation and processing plant, Kerse of Kinneil, near the Grangemouth Refinery in Scotland, and natural gas is transported through a dedicated Britannia pipeline to the Scottish Area Gas Evacuation (SAGE) facility at St Fergus, Scotland. To enable production over Britannia, tie-ins could occur at either the Britannia platform, the bridge-linked platform (BLP), or any one of the subsea manifolds: Brodgar, Callanish, Enochdhu, or Alder (Alder is operated by Ithaca). There are also three spare risers on the BLP.

Key Facts

Block 16/26 Britannia
Sector U.K. Central North Sea
Approx Distance to Land 210 kilometres/130 miles NE of Aberdeen
Water Depth 136 metres (446ft)
Hydrocarbons Produced Oil, Gas and Condensate
Export Method Gas – by a 28-inch, 116-mile pipeline to the SAGE terminal at St Fergus.
Oil and Condensate – by a 14-inch, 28-mile pipeline to the Forties Pipeline System via the Unity Platform and onwards to Cruden Bay.
Manned/Unmanned Manned
Operated/Non-Operated Operated
% of Chrysaor Equity 58.7%
First Production 3 August 1998
Accommodation on Board 184
Key Commercial Terms Infrastructure Access Agreement Summaries - Alder Field


Entry Specification:

Dependent on the point at which any potential third-party would enter the Britannia facilities and the composition of production already being processed at that time (also includes areas that cover onward transportation).

Exit  Specification:

Liquids are exported via the Forties Pipeline System (FPS) (directly negotiable between prospective third-party and FPS). Any exit specification must be achievable with the processing facilities available on the Britannia facilities. Gas is exported through the Britannia pipeline for further processing within the SAGE Gas Terminal at St. Fergus. Exit specification is the National Transmission System specification at that point.

Outline details of Primary separation processing facilities:

Primary separation consists of: Britannia Platform - HP Separator (3-phase)*, Platform Well Test Separator (3-phase)*, Finlaggan Separator (3-phase), MP Separator (3-phase), Bridge-Linked Platform (BLP) - Brodgar HP Separator (2-phase), Callanish Separator (3-phase), Brodgar IP Separator (3-phase), Alder Separator (3-phase). 
*Water is separated, metered and recombined.

Outline details of gas treatment facilities: Booster compressor is available upstream of the gas treatment and compression trains and allows the Britannia HP Separator to be operated at a lower pressure. There are two parallel gas treatment and compression trains each reducing hydrocarbon dewpoint and water content before compressing the gas for export.


The basic capacity information is portrayed by colour coded 'traffic lights' that reflect thresholds of availability over the next 5 years

Available Capacities

5% to 25% 
Britannia Platform firm processing capacity available Ullage as % of system capacity Comment
2021 2022 2023 2024 2025
Oil export capacity  
Gas compression capacity Based on dual train operation
Booster compressor capacity  
Gas export capacity Based on dual train operation
Gas lift capacity  
Produced water handling capacity Alder produced water is not commissioned yet
Dehydration capacity Based on dual train operation
H2S removal capacity           None
Water injection capacity           Topsides modifications would be required to provide water injection
POB capacity Sleeping accommodation has been upgraded to 184

Last update: December 2020


While this information has been prepared in good faith, no warranty or representation (implied or expressed) is made as to its accuracy, completeness or relevance for use by any other party and no liability is accepted by Chrysaor under any circumstances relating to the information and the use thereof.

.pdf copy available here

Contact Information

Louise Longhurst

T: 44 (0) 1224 205766