Britannia is one of the largest natural gas and condensate fields in the North Sea. Commercial production began in 1998. 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.

Britannia Map

Key Facts

Block 16/26
Sector U.K. Central North Sea
Approx Distance to Land 210 kilometres/130 miles NE of Aberdeen
Water Depth 136 metres
Hydrocarbons Produced Oil, Gas and Condensate
Export Method Gas and Gas liquids – by a 28-inch, 116-mile pipeline, to St Fergus, Scotland.
Condensate – by a 14-inch, 28-mile pipeline to the Forties Pipeline System via the Unity Platform.
Manned/Unmanned Manned
Operated/Non-Operated Operated
% of Chrysaor Equity 58.7%
First Production 3 August 1998
Accommodation on Board 184
Key Commercial Terms Published Key Terms - ALDER


Description: The Britannia facility processes oil, condensate and gas from the Britannia, Brodgar, Callanish, Enochdhu and Alder fields. Gas is exported by pipeline to the Scottish Area Gas Evacuation (SAGE) Terminal at St Fergus. Condensate is exported via the Unity platform into the Forties Pipeline System (FPS). 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 Chevron). There are also three spare risers on the BLP.

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 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)*, Subsea Well Test 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.
**Subsea Well Test Separator is being repurposed as the Finlaggan Separator (3-phase) in 2019.

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
2019 2020 2021 2022 2023
Oil export capacity  
Booster compressor capacity  
Gas compression capacity  
Gas export capacity  
Gas lift capacity  
Dehydration capacity  
H2S removal capacity            
Produced water handling capacity  
Water injection capacity           Topsides modifications would be required to provide water injection
POB capacity Sleeping accommodation has been upgraded to 184

Last Update: July 2019

Contact Information

Louise Longhurst

T: 44 (0) 1224 205766