Guidance for Integrity Management of Buried Pipelines Subjected

Guidance for Integrity Management of Buried Pipelines Subjected to Ground Movement SBD-1 -2 Contract Number: PR-350 -164501 Yong-Yi Wang Center for Reliable Energy Systems 5858 Innovation Dr. Dublin, OH 43016 USA October 23, 2018 3/10/2021 © CRES

Overview High-level status q Overall impression from executing this PRCI project work q Structured response plan q Plan for next steps q Guidance for Integrity Management of Buried Pipelines Subjected to Ground Movement 3/10/2021 © CRES 2

Objectives and Overall Status q Objectives v Develop ‘short’ guidance document on the management of ground movement hazards for pipeline integrity engineers responding to an event q Status v The project was very active. ►Seven team meetings since March 2018 TC meeting in Miami. v Draft final report was submitted 8/20/2018. v Feedback was received from team lead on 8/29/2018. v The report is being re-written. Guidance for Integrity Management of Buried Pipelines Subjected to Ground Movement 3/10/2021 © CRES 3

Overall Impression from Executing this PRCI Project Work q q q Very geohazard is different. Proper responses to each geohazard vary. Having simple, short, and effective guidelines is a challenge. Expectations for the project vary from participants’ experience and circumstances they deal with. Post-event response differs, depending on v v v v v Nature of the event Location of the event Level of impact on pipelines Short- and long-term ROW conditions Easy of access Existence of a response plan prior to the event Number of simultaneous events one has to deal with Risk and consequences Company philosophy Guidance for Integrity Management of Buried Pipelines Subjected to Ground Movement 3/10/2021 © CRES 4

Structured Response to Geohazards q Three phases v Phase I – short-term qualitative response v Phase II – one to six month response, either “permanent” or “temporary” solutions v Phase III – solve problems not solved in Phase II Guidance for Integrity Management of Buried Pipelines Subjected to Ground Movement 3/10/2021 © CRES 5

Structure of the Response q Phase I - short-term qualitative effort v What happened? ►to the pipeline ►to the ROW ►to the adjacent pipeline(s) v Quick operating decisions ►Shutdown, pressure reduction, full-pressure operation v Is ROW stable? ►Safety of the inspection crew ►Longer-term increase in strain demand v Is the integrity of the pipeline stable if ROW is stable? ►E. g. , fatigue of buckles v Crew and public safety Guidance for Integrity Management of Buried Pipelines Subjected to Ground Movement 3/10/2021 © CRES 6

Structure of the Response Phase II - one-week to 6 -month effort – further assessment and short-term mitigation q Goal - get the line back in full-pressure service q Assessment q v Pipeline integrity v ROW q Work – Level 1 (low- to medium-level impact) v ROW stabilization v Strain capacity enhancement v Monitoring q Work – Level 2 (high-level impact) v Reroute, including HDD, etc. v Pipe replacement v Monitoring Guidance for Integrity Management of Buried Pipelines Subjected to Ground Movement 3/10/2021 © CRES 7

Structure of the Response Phase III long-term mitigation q Goal - get the line back in full-pressure service q Executing work defined in Phase II, but could not be accomplished in 6 months q Guidance for Integrity Management of Buried Pipelines Subjected to Ground Movement 3/10/2021 © CRES 8

Plans for the Next Step Have a revised report before Thanksgiving q Wrap up the report before the end of year, if comments can be received by mid. December. q Guidance for Integrity Management of Buried Pipelines Subjected to Ground Movement 3/10/2021 © CRES 9