FEC completed the mechanical, structural, access and piping design for the entire repair sequence of 2 thickener tanks at a Queensland alumina refinery. At 22m in diameter and over 15m high, the replacement of the top strake presented several challenges. A common platform spanned across the two side by side tanks and supported a large internal rake arm.

FEC worked with our client, the contractor and achieved the following outcomes:

  • An effective repair procedure for supporting the top platform while removing the top strake.
  • Access design for tank mounted scaffolding brackets and handrails as well as temporary attachment to a highly corroded tank shell
  • Optimisation of the wind girder position to maintain compliance with API650 and also provide a dual purpose access support points.
  • Redesign of the auxiliary platform and stairway including site measure, total station survey and fabrication drawings to achieve on-site fit with existing tie-in points.
  • Mechanical redesign of the overflow tank piping to reduce vibration
  • Strake removal and reinstatement sequencing to ensure tank integrity throughout the entire process including wind and seismic considerations
  • Repair approval to API650
  • RPEQ approval of the entire project scope