Guidelines for the assessment of corrosion threats in risk-based inspection

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  • Published: November 2019
  • REF/ISBN: 9781787251403
  • Edition: 1st
  • Status: Current

This document provides a tool to help engineers practically develop corrosion risk assessment procedures within their organisations and hence more accurate inspection regimes, providing an additional required tool to help engineers in the key areas of corrosion resistant alloys and risk-based inspections as part of a successful corrosion management strategy. It covers the full complement of criteria that can be used to assess corrosion threats specific to upstream oil and gas production and processing equipment, including offshore fixed and rotating pressure systems equipment, utilities systems, pipelines and structures.

The good practice outlined in this document can be used to:

  • identify audit methods or improvement activities needed to avoid the pitfalls of inaccurate corrosion threat assessment;
  • demonstrate good risk visibility, and
  • improve the planning of corrosion management activities and eliminate low value work and avoid wasted effort on inspection, anomaly management, maintenance and upgrade projects.

This document is intended foe anyone who wishes to improve their understanding of CTA, or to gain further knowledge to improve corrosion and integrity management. This document is particularly relevant for:

  • corrosion, inspection and integrity engineers;
  • integrity managers, and
  • engineering disciplines who aim to improve process safety or cumulative risk management.

The following degradation issues are excluded from this document:

  • Thermo-mechanical degradation and equipment primarily affected by this mode of failure, such as flare tips and some components of fired equipment or waste heat recovery units.
  • Purely mechanical degradation mechanisms such as fatigue, fretting or overload. Examples are: flexible hose fretting and wear; vibration of high-cycle fatigue; low-cycle fatigue (for example for moving well conductors); U-tube heat exchanger bundle baffle fretting; offshore platform dropped object impact damage, etc.
  • Fitness-for-service assessment for equipment cracking or thinning.

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