Pre-FEED and FEED

Alder Field Subsea System

Project Alder stock
A high pressure and high temperature gas condensate field
Location: North Sea, UK
Operator: Chevron
Duration: 2012 - 2017
Scope: Pre-FEED and FEED Services

During Pre-FEED we undertook subsea system designs for a 27km subsea tie-back to Britannia, and for a FPSO alternative that included a gas export system to a tie-in point on a third-party trunkline. FEED followed for the selected option of the subsea tie-back. Our multidiscipline engineering team addressed the key project challenges of:

  • Development of the flowline pressure containment strategy downstream of the subsea HIPPS including demonstration of the feasibility of utilising a lower rated riser
  • Functional design of Chevron’s first subsea HIPPS
  • Safety engineering activities including a LOPA, SSIV location, fortified zone design, dropped object study
  • Design of a twin cooling loop manifold structure including CFD assessment of heat transfer
  • Corrosion Management Strategy to enable use of carbon steel pipeline in aggressive fluid environment
  • Flow assurance including the development of comprehensive operating philosophies
  • Mechanical design including limit state analysis, upheaval buckling assessments

In addition, the FEED activities included design of the subsea production system, pipeline installation market review, pre-commissioning assessment, FEED procurement specifications, cost estimates and project schedules, and support to Value Improvement Practices.

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