Corrosion Under Insulation application

A digital solution to the costliest corrosion threat

Research Review 2018

Corrosion Under Insulation (CUI) may be the costliest corrosion phenomena for the oil & gas and petrochemical industry. It is difficult to detect due to its nature – since it is invisible under insulation, it might represent a high risk due to the potential high corrosion rates, which are difficult to predict. DNV GL has, together with the industry, developed a methodology for risk management of CUI. In this year’s Extraordinary Innovation Project, the methodology has been embedded into a web application for easy implementation.

Through a recent CUI Joint Industry Project (JIP), DNV GL has, together with partners from the oil and gas industry, established a methodology for managing the CUI threat. In this context, managing the CUI threat involves risk assessment, risk mitigation and risk update in a systematic manner.

DNV GL will enable this methodology for the industry in a RP in 2019. The RP is planned to be issued alongside the Veracity web application “CUI Manager” supporting the RP work process. This web-application can be aligned with individual company specific requirements, rely solely on the DNV GL RP methodology, or use a combination of the two.

The CUI Manager will enable the users to assess the CUI risk and evaluate the risk impact of different mitigation measures such as Radiographic Testing (RT) inspection, General Visual Inspection or Close Visual Inspection after removal of insulation.

The CUI web application will use existing 3D models for visualization, planning and reporting, but will also work with a traditional drawing basis. A reporting tool for reassessment will also include easy and anonymous export to a global data base enabling learning across the industry. This feature enables the users to make better decisions through global CUI data sharing. Machine learning algorithms will support identification of the most risk-reducing and cost effective mitigations.

The CUI Manager includes a module for alignment with company or asset specific methodologies. In this module, the user can include local challenges and experiences to further improve the methodology. Specific cost data and means of mitigation should also be uploaded to be better aligned with local conditions.

Decision basis in the web application is based on results from the CUI Joint Industry Project, NACE, NORSOK, ISO and API standards and documents. CUI Risk management methodology will be publicly available in a DNV GL Recommended Practice during 2019.

Benefits of using the CUI Manager:

  • New CUI risk assessment methodology enabling better decision-making and more efficient management of CUI, thereby increasing safety and optimizing cost
  • A digital solution to ease the implementation of the new methodology
  • Ability to assess mitigation cost versus risk mitigating effect
  • Use of 3D models to ease communication and ensure more efficiency in the field
  • A Global Shared Database to ensure continuous improvement and learning across companies