St. Fergus Gas Terminal

Overview

The St Fergus Gas Terminal ("SFGT") is located on the north east coast of Scotland just north of Peterhead. The St Fergus area is the landfall for several major North Sea gas pipelines and the home to the adjacent Shell operated SEGAL gas terminal and the Ancala operated SAGE gas terminal, as well as a National Grid National Transmission System (NTS) facility.

It was originally constructed in two phases to process gas from the Frigg Field – Phase 1 in 1977; Phase 2 in 1978. Phase 3 was constructed to handle the richer gas from the Total operated Alwyn Field which was discovered in the 1980s and Phase 1 was decommissioned. Subsequently, Phase 3 was expanded by the addition of a third gas processing train when the BP operated Bruce Field was developed.

The St Fergus Gas Terminal is one site which services two pipelines, namely;

  • FUKA (Frigg UK Association) Pipeline; 100% owned by NSMP Operations Limited
  • Vesterled Pipeline owned by Gassled Partners
Capacity(MMscfd)
1,271
Commissioned
1977
Liquids Production
35 kbpd
Availability
>99%

Process

The capacity of the Frigg UK Terminal at St Fergus is:

  • nominally 1,271 MMscfd (through three gas processing trains)
  • liquids production of 35 kbpd

Gas processing is by JT valves and/or turbo expander. Liquids handling is by two de-ethaniser trains.

The gas trains are identical and designed for parallel operation. They feature the following operations:

  • liquids separation (inlet scrubber)
  • gas dehydration
  • NGL recovery
  • sales gas re-heating

The liquids trains are built for parallel operation, and feature the following operations:

  • liquid dehydration
  • de-ethanisation
  • associated off-gas compression

The pressure and temperature of the process facilities are a function of the operating mode. This can be either high or low liquids production, depending on the prevailing economics.

The gas will be redelivered to the National Grid Terminal for entry into the National Transmission System (NTS) in a condition to meet the NTS Specification, with the CO2 content in accordance with the specification applicable to the Frigg UK Terminal (currently 4% mol).

Liquids produced during the processing of gas at the Frigg UK Terminal will be to NGL sales quality. The liquids can be exported to either Mossmoran via the adjacent FLAGS Terminal operated by Shell or to Kinneil via an export line to INEOS's FPS facility at Cruden Bay.

The liquids are processed to meet the specifications for either pipeline in terms of water content, H2S, Sulphur, Methane, CO2, Methanol, Dodecane+, True Vapour Pressure, and MercaptanSulphur.

It is the responsibility of the various FUKA shipper groups to be enter into TPAs with either of the downstream NGL evacuation providers.

Ullage

The ullage profile shown below is for the FUKA System (pipeline and terminal); the capacity is nominally 1,271 MMscfd but is dependent on pipeline operating conditions and the gas composition of Shipper fields.

  2017 2018 2019 2020 2021 2022 2023 2024
Availability
> 25%
5% - 25%
< 5%

Operational Excellence & Plant Awards

The St. Fergus Gas Terminal is justifiably proud of its operational excellence performance and, since commencement of operatorship in 2016, we have achieved a number of significant milestones and awards for safety and environmental performance. Some of these are listed below

  • Zero LTIs
  • Zero RIDDOR reportable incidents
  • Zero environmental exceedances since
  • > 99% availability since 2016 (excluding planned outages)
  • Achieved RoSPA Gold Award for last 4 years
  • ISO 14001 Environmental Compliance Standard
  • ISO 9001 Quality Management System accreditation