AGL required inspection and condition assessment of the concrete chimney stack. Duratec used a Remote Piloted Aircraft and ground camera to collect high definition photography of the structure for the production of a 2mm resolution 3D model.


A desktop condition assessment was completed on the

3D model by tagging defects and entering information in Duratec’s defect database, AnnoView. Defect reporting was delivered overlaid on a 2D plan with the stack image rolled out flat enabling the cylindrical structure to be visualised on one page.

Our new inspection workflow:

  • Eliminates the need for rope
  • Enables client access to defect reporting and on-going management of defect remediation.
  • Provides 3D model and mosaic images as reference for future auditing, upgrade design and maintenance planning.


  • Accurate defect itemisation and measurement.
  • Visual reporting delivered to client.
  • Integrated model and defect tagging.
  • Reduced risk – no rope access or working at heights.


  • 3D Modelling

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