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Cryogenic processing and liquefied natural gas

Costain offer solutions for the delivery of safe and reliable plants and processes for the liquefaction of natural gas. We have extensive international and UK experience in cryogenic gas processing on new liquefaction plants and LNG import and storage terminals, as well as for the modification of existing assets.

Our LNG and floating liquefied natural gas (FLNG) solutions cover all phases of the asset lifecycle, from feasibility, concept definition and selection to preliminary engineering, detailed design, construction, commissioning and operational support - providing improved performance, simplicity of operation, increased safety and value engineering to reduce overall project costs.

Our capability

Costain’s design and engineering capability covers all liquefaction technology, including expander cycles, multi-stage mixed refrigerant cycles and optimised cascade processes.

We can take an independent view of small, medium and large base-load projects worldwide, both for onshore and offshore floating facilities. We can also assess, upgrade and optimise the performance of existing plants, as demonstrated on the delivery of three major LNG train overhauls on Das Island in the Arabian Gulf.

Our rich heritage in cryogenic gas processing enables us to offer effective solutions to the challenges associated with natural gas liquefaction, including:

  • Modularisation
  • Loading
  • Storage
  • Transhipment
  • Regasification
  • Compression
  • CO2 capture
  • Propane injection
  • Nitrogen ballasting
  • Floating storage and regasification units (FSRU)
  • LPG extraction.


Proprietary technology

Our portfolio of patented technologies is continually extended to offer innovative solutions that meet and exceed our clients’ needs. One of our recent patents is the safe, flexible and highly operable double nitrogen expander cycle, which provides a reliable process that improves liquefaction efficiency. We have extensive experience of this technology from industrial gas processing as well as LNG.

Costain has also developed a simple, reliable, low capital cost process removing nitrogen from LNG to <1 mol%, enabling management of nitrogen in LNG flash gas streams and producing a pure nitrogen stream suitable for venting.



Robert Pitman
Director, Business Development 
Tel: 0161 910 3444
[email protected]



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