Client: HWCG
Location: Gulf of Mexico

HWCG needed to develop a flow-and-capture system that employs two MODUs complete with test spreads in the emergency case of a hydrocarbon spill from a subsea well in the Gulf of Mexico.

The intention was to increase capture capability of the leaked product compared to existing systems in place from 50M BOPD to circa 75M BOPD. A high level concept was proposed that required a flowline system to transfer the fluid between the two riser stack ups. Deepwater scenarios were up to 10,000 feet and pressures up to 15,000 psi.


  • Basis of design development to gather and collate all data pertinent to the design work
  • HAZID workshop to identify project hazards and risk register development to aid decision making
  • Flow assurance analysis to determine the capacity of the proposed system
  • Flowline mechanical design and jumper analysis to establish suitable configuration
  • Material selection recommendation
  • Flow induced vibration assessment of the system
  • PLETs definition
  • Jumper and connection system definition
  • Second end flowline hub definition
  • Offshore construction definition
  • Installation and recovery methodologies
  • Pre-commissioning, operating and decommissioning philosophies.

The level of technical development achieved during this FEED work also enabled development of Class 3 cost estimates and a high level project execution schedule.


  • Multidiscipline integrated project team
  • Focused on client and project delivery
  • Developed specifications required for detailed design
  • Proved feasibility for range of conditions.