Access to oil and gas infrastructure

The infrastructure code of practice is a voluntary arrangement developed by Oil & Gas UK in consultation with the Department for Business, Energy and Industrial Strategy (BEIS).

In this article

Access to oil and gas infrastructure

Under the arrangement, offshore oil and gas companies have agreed to publish technical and commercial data about the pipelines and facilities that they operate on the UK Continental Shelf (UKCS) in order to facilitate the utilisation of such infrastructure for the development of remaining UKCS reserves. The link below will take you to pages showing the location of infrastructure, technical details and an outline of the commercial terms for the assets on the UKCS where ExxonMobil is an owner.

SEGAL system

The Shell-Esso Gas and Liquids (SEGAL) system incorporates the Far North Liquids and Associated Gas System (FLAGS), the Fulmar Gas Line (FGL), the receiving terminal at St Fergus, the Mossmorran NGL fractionation plant and the Braefoot Bay loading facilities in Fife. It currently processes wet gas from UK and Norwegian fields. An extensive rejuvenation programme was completed in 2012.

The Shell-Esso Gas and Liquids (SEGAL) system terminal at St Fergus is located 65km north of Aberdeen and has a capacity of 32 million sm3/d of wet gas.

There are two pipelines feeding into the St Fergus terminal:

  • FLAGS Pipeline - nominal wet gas capacity 33 million sm3/d.
  • Fulmar Gas Line (FGL) - nominal wet gas capacity 12 million sm3/d.

Following the removal of sales specification gas at the St Fergus terminal, the remaining NGL mixture is transported to the Mossmorran NGL fractionation plant in Fife, which has a capacity of 12,500 tonnes/d.  The propane, butane and condensate are subsequently transported and redelivered to Braefoot Bay for onward shipping.

The equity ownership of the SEGAL system is:

  • ExxonMobil - 50%
  • Shell - 50%

The operator of the SEGAL system is currently Shell U.K. Limited.

The link from Technical/Capacity within System Overview will direct you to the relevant Shell webpage.

Last updated Jan 2015

SEGAL technical/capacity

Last updated Jan 2021

Esso indicative tariff for the SEGAL system

The tariff is subject to hydrocarbon composition and specific commercial and technical terms of the service but is expected to be in the range of 0.5 - 3.5 pence/sm3 for a wet gas TPFA service as of January 2015, escalated annually and valid for the next five years.

Last updated Jan 2015

SEGAL system executed contracts

This page contains summaries of agreements published in accordance with the Infrastructure Code of Practice (ICOP). Please also refer to the ICOP website of Shell UK Ltd. who is the operator of the SEGAL system.

Last updated Jan 2015

Contact us

The Esso Exploration and Production UK Limited Natural Gas Liquids and Infrastructure group can be contacted on +44 1372 412 294.

Alternatively, contact us by email.

Last updated Jan 2019

Legal notice relating to summary information on website

The summary information on this website is provided:

  • in good faith and without any liability;
  • without warranty, implied or expressed, as to its accuracy or relevance of use by any other party;
  • without obligation to provide any further information in respect of the agreement / transaction to which the summary information relates, and
  • without any obligation to provide access to infrastructure or services on the same or similar terms and conditions or at all.

Further, it should be noted that the information provided has been developed in accordance with the voluntary Code of Practice on Access to Upstream Oil and Gas Infrastructure on the UK Continental Shelf to give an indication of the characteristics / capacity of the infrastructure in question based on a typical operation. Actual characteristics / capacity may vary and will depend on current and planned operations from time to time. Accordingly, any entity considering seeking access and user rights in the infrastructure or any part thereof is encouraged to make early contact with the operator to explore all the potential opportunities, alternatives and limitations of services that may be offered.

Related content



ExxonMobil has an interest in around 40 producing offshore oil and gas fields in the North Sea. Many of these fields are operated by Shell U.K. Exploration and Production as part of a joint operation.
Operations overview

Operations overview

Exxon Mobil Corporation is the parent company of the Esso, Mobil and ExxonMobil companies that operate in the United Kingdom.
Operated by others

Operated by others

Many of the production fields in which ExxonMobil has an interest are operated by another company as part of a joint operation.


The exploration part of our business is concerned with identifying, capturing and evaluating new oil and gas resources.
Canadian oil sands: a source of secure, accessible and affordable energy

Canadian oil sands: a source of secure, accessible and affordable energy

Through the responsible development of its oil sands, Canada continues to play an increasingly important role in meeting rising global energy demand.