Decommissioning Ageing Infrastructure: Abandoning or Re-routing Hydrocarbon Pipelines

Sponsored by: STATS Group

Focused on:

  • Hydrocarbon
  • Pipelines
  • Isolation Tools

Date: 15 November


Time: 3PM London/10AM New York

Utilising isolation plugs and intervention equipment to safely decommission pipelines

In recent decades, the North Sea and Gulf of Mexico have seen an increase in decommissioning activity as hydrocarbon reservoirs are depleted. As oil and gas wells and installations developed from the 1970s onward reach the end of their useful lives, hot spots are now emerging around the globe. Over the coming years, it is expected that hundreds of offshore assets are scheduled to be decommissioned worldwide.

As fields reach the end of their economic life, specific parts of the pipeline system naturally become redundant, and with no potential future use, are required to be decommissioned. This webinar will discuss the benefits of utilising isolation plugs and intervention equipment as safe and effective tools during the challenging process of decommissioning to abandon or re-route hydrocarbon pipelines and infrastructure.

STATS isolation tools are Type Approved and fully certified by DNV GL to verify that the design criteria satisfy the requirements for Pipeline Isolation Plugs to provide dual seal and isolation in accordance with Offshore Standards; DNVGL-ST-F101 (Submarine Pipeline Systems) and recommended Practices; DNVGL-RP-F113 (Subsea Pipeline Repair). These devices provide the highest level of safety for divers and protection to the environment during decommissioning activities.

In some instances, STATS isolation equipment has been used for maintenance and modification scopes and safe tie in of new production facilities on many assets, latterly, this same equipment has been used for abandonment and decommissioning on those assets where it had been used to maintain production.

Often, utilising a single product line cannot on its own achieve the desired end state, but when isolation plugs and intervention plugs are used in combination, safe, pressure competent access points into piping systems and pipelines can be made allowing the operator to safely isolate or disconnect infrastructure from hydrocarbon production.

Presented by

Dale Millward,

Director of EPRS & Subsea Services

Dale has worked in the pipeline and subsea intervention industry since 1992 with involvement in subsea construction, commissioning, repair, isolation, maintenance and decommissioning projects.

He graduated from the Robert Gordon University in Aberdeen with a B.Eng (Hons) in Mechanical and Offshore Engineering. He worked as a subsea Engineer as the Client's Representative on diver and WCROV projects and is an IMCA certified Technical Representative. He joined STATS Group in 2005 and has been involved in the design, development and delivery of bespoke engineered pipeline isolation, repair and recovery solutions.

Key Learning Objectives

  • Examples of decommissioning scenarios utilising isolation plugs to abandon and re-route pipelines
  • Benefits of utilising isolation plugs and intervention equipment to safely decommission pipelines
  • Overview of isolation plugs to provide dual seal and isolation in accordance with Offshore Standards; DNVGL-ST-F101 and recommended Practices; DNVGL-RP-F113
  • Case studies highlighting isolation plugs used during pipeline and infrastructure decommissioning


  • Decommissioning Manager
  • Decommissioning Team Lead
  • Integrity Engineers
  • Structural Engineers
  • Subsea Engineers
  • Technical Safety
  • HSE
  • Project Engineers
  • Offshore Management
  • Consultants
  • Pipeline Technical Authority
  • Asset Integrity Manager
  • Pipeline Asset Manager
  • Pipeline Maintenance
  • Operations & Maintenance Manager
  • Technical Manager
  • Head of Maintenance
  • Flowlines / Risers and Pipeline Team Lead
  • Subsea Pipelines
  • Subsea Engineer