Learnings

Outcomes

Phase 1 – Deployment plan for the advanced inspections was completed including Front-End Engineering Design (FEED). The deployment was lined up with existing BAU inspection activity. Appropriate inspection tools were selected and ROSEN constructed tools to the required specifications. All work is summarised in the phase 1 report. 

Phase 2 – Inspections were completed alongside other BAU work, summarised below. A comprehensive lessons learned exercise was completed, resulting in the lessons learned document. This learning has already been drawn upon by the NGT East Coast Hydrogen and Project Union teams. 

Phase 3 – ROSEN provided reports from all tools back to National Gas Transmission as part of Phase 3. This includes reports for Depth of Cover, MFL-A and XT services, DMG, EMAT (including MFL-C,) and PGS tools. The data was presented in a geodatabase-ready format.             

Phase 4 – A technical report was completed by ROSEN which provides a high-level summary of in the inspections, and comments on their implications for pipeline repurposing to hydrogen. Phase 4 also included a cost benefit analysis to compare the cost of additional tool deployment with the benefits of better integrity data, including consideration of how useful this data is for hydrogen repurposing. This CBA was reviewed by Pipeline Integrity Engineers Ltd, and independent 3rd party, to ensure it was not biased. 

ROSEN also supported National Gas Transmission to understand the novel data provided by the new tools by hosting a workshop with National Gas Transmission colleagues. 

Lessons Learnt

This project produced a comprehensive lessons learned report that covers the scope of the project (advanced ILI) and is contained in the Phase 1 report.

Lessons learned with consideration to the project methodology: this project scope included a cost-benefit analysis of the inspection undertaken, which would weigh the benefits of the data collected against the additional cost of tool deployment. This document was written by National Gas Transmission and ROSEN. During the course of the project, it was decided that this report would benefit from independent review by a qualified 3rd party. Contact was made with Pipeline Integrity Engineers Ltd who reviewed the CBA and provided independent oversight, which is attached to the report as a technical note.