Integrity Management of Unpiggable Pipeline

Surat Basin, QLD


Arrow Energy


12 Months


Asset Integrity

Case Study
Integrity Management of (Braemar 2) Unpiggable Pipeline


The asset integrity strategy for unpiggable sections of the Braemar 2 Gas Pipeline comprised of a direct assessment program following AS2885.3 ‘four-element’ approach and adopting the NACE Standards for Internal Corrosion Direct Assessment (ICDA) and External Corrosion Direct Assessment (ECDA) as a guideline.

Key Achievements

  • Formulated integrity assessment program basis and strategy incorporating the long term asset management requirements of the un-piggable sections of the Braemar 2 Gas Pipeline.
  • Segmented the pipeline into different regions based on pipeline design, construction and operation history which enabled the development of a ‘risk based approach’ supporting future operation of the pipeline.
  • Completed the following activities with zero harm, on time and on budget:
    • ECDA Indirect Inspection (i.e DCVG and CIPS)
    • ECDA Direct Examination at 13 Locations
    • ICDA Indirect Inspection (multiphase flow calculations using pipeline characteristics, historical operation data and pipeline elevation profile)
    • ICDA Direct Examination at 13 Locations
  • This program subsequently enabled a 10 years life review and continued safe operation in compliance with AS2885 and P&G Act.