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Thornton Engineering manufactured an Alkylation Unit Column for the production of high-octane fuel for an Australian-based refinery. The scope of work included:

  • Vessel design and detailing, including third-party verification
  • Statutory design registration
  • Global procurement of raw materials
  • Development of several weld procedures including exotics
  • Manufacture of vessel, platforms, ladders and pipe supports
  • Column Section Stress Relieving
  • Testing of vessel – hydrostatic, proof load testing
  • Surface treatment
  • Transport to site

Steel was sourced internationally from a Belgium mill due to the strict chemical restrictions and Hydrogen Induced Cracking (HIC) resistance.

All fabrication for the project was performed in-house, giving Thornton Engineering greater project control with less reliance on sub-contractors and less risk on scheduled activities. This column was treated as two assemblies in our 25m Stress Relieving Oven, then hydrotested and painted in our 40m in-line paint shop.

This column was successfully delivered on time to client specifications for a planned shutdown.


Dimensions32m (H) x 3.0m OD
Design Pressure1035 / -80 kPa(g)
Material A516-65N (HIC+S54)
ClassificationClass 1B

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Further Information

Craig Malt +61 (0) 3 5274 3180

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