Sector: Process Industries

Onshore Compression Terminal - Conoco Phillips Ltd

  • Location: Theddlethorpe
  • Client: Conoco Phillips Ltd
  • Duration: 104 weeks
  • Consultants: Fluor Engineering

This Freon Gas Replacement scheme involves working within a live gas terminal site, requiring adherence to stringent Health & Safety regimes.

Fluor Engineering were awarded the contract to undertake the design of the “Freon Gas” replacement scheme at the Conoco Phillips Gas Import Facility at Theddlethorpe, Lincolnshire. Fluor approached Clugston to tender for the civil package which was followed by a contract from Conoco Phillips.

Feon Gas is an ozone depleting gas, a CFC that under European Regulations could no longer be manufactured and used. It is a refrigerant used in cleaning the gas as it arrives from the North Sea and before it enters the National Gas Grid.

Construction activity was split into two phases.

Phase 1 - Civils works for a temporary Construction Area and Contractor Yard with associated infrastructure. This area is used for offices, facilities, storage, car parking and equipment yard.

Phase 2 - Civils works for the Process Unit including ground works, piling, reinforced foundations, underground works, plant supporting ground slabs, paving and specialist grouting.


The foundations varied from light to heaviliy piled foundations and were up to 4m in depth. All the foundations required the casting in of holding down bolts, with the use of sleeves to very tight tolerances. The site is one of the largest gas terminals in the country pulling in approximately 15% of the UK’s total gas supply and is therefore a site of high national security.

It is also classified as a Category 1 site to offshore safety standards, with a highly demanding health and safety regime. The onsite works were fenced and controlled through CDM regulations and under a very strict Client permit regime.

The works required continual planning and coordination with the Client, the Designers and the Process Contractors due to the site being continually live.

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