MSI Inspection in Wellington | TDG Environmental

case study

MSI Inspection in Wellington

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TDG conducted a comprehensive assessment of the interceptor using Multi-Sensor Inspections (MSI), incorporating HD CCTV, Laser Profiler, and Sonar transducer technologies to evaluate corrosion or losses along the pipewall in a 360-degree fashion, alongside a general condition assessment.


  • Addressing challenges posed by high-level and high-velocity flow during MSI unit deployment and retrieval.
  • Managing noise disturbances from aircraft traffic.
  • Coping with severe wind gusts prevalent in Wellington.

The outcome

  • Client was extremely pleased with the comparison reporting clearly showing the severe rate of degradation.
  • The pipeline was escalated for relining.


Sewer & Water Authorities



Project Highlights

  • Proactive Identification: Through proactive identification, the TDG Team detected severe corrosion, initiating a comparison report spanning inspections from 2013, 2018, and 2020, which revealed substantial increases in wall loss percentages (2013 = 16%, 2018 = 26%, 2020 = 28%), validating the effectiveness of MSI technology and underscoring the necessity of ongoing inspections for infrastructure planning and budgeting.
  • Prominent Waterfront Location: Undertaken in a high-profile waterfront setting, the project presented unique challenges and heightened visibility.
  • Innovative Reporting: Pioneering the development of a comparison report with the Red Zone, TDG presented findings to the client, quantifying progressive pipe wall degradation over three consecutive inspections.

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