Subsea Repair Scenarios of Damaged Pressurised Pipelines

Sponsored by: STATS Group

Focused on:

  • Pipelines
  • Repair
  • Isolation Tools

Date: 22 September


Time: 3PM London/10AM New York

Pressurised pipeline repair facilitated by non-piggable and piggable type approved isolation tools

The global oil and gas industry is reliant on the long term dependability of pipelines. Rigid pipelines are vital to the safe and efficient transportation of hydrocarbons; as such failures within these pipelines can have huge environmental, safety and reputational implications. As the global demand for energy increases as does the consequences of any potential pipeline failure. Operators can often encounter difficulties in isolating sections of their pipeline to facilitate repair or maintenance activities if appropriate valves are absent from the line.

This webinar will describe pipeline isolation tooling and techniques that enable safe modification of pressurised subsea pipelines. Double block and bleed isolation tools have been utilised to greatly reduce downtime, increase safety and maximise unplanned maintenance, providing cost-effective solutions to the end user. High integrity isolation methods will also be explained that enable piggable and unpiggable pipeline systems to be isolated before any breaking of containment and in compliance with subsea isolation guidelines.

This webinar will discuss subsea pipeline damage scenarios and repair options available to ensure a safe isolation of the pipeline and contents in the event of an incident. DNV GL type approved isolation technology has been developed to enable the installation of fail-safe, double block and bleed isolation tools, in the event of an unpiggable midline defect.

The webinar will conclude with a case study highlighting how a complex and challenging repair was executed on a 28" gas export pipeline in the South China Sea. This successful subsea repair was conducted safely and without the need to depressurising the entire 780km pipeline.

Latest STATS Group Blog

Are you Prepared for Subsea Pipeline Repair Emergencies?

Presented by

Dale Millward,

Director, 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.

Read our interview with Dale here.

About STATS Group

STATS Group are market leaders in the supply of pressurised pipeline isolation, hot tapping and plugging services to the global oil, gas and petrochemical industries. STATS DNV GL type approved isolation tools provide leak-tight double block and bleed isolation that enables safe and efficient maintenance, repair and modification of pipeline infrastructure.

BISEP™ - Hot Tapping & Plugging

Hot Tapping and Plugging can be achieved using STATS patented BISEP™. The fail-safe double block and bleed isolation is deployed through a single full bore hot tap penetration, without the need for additional bleed or vent ports. The BISEP™ offers significant safety advantages over traditional line stop technology, the hydraulically activated dual seals provide leak-tight isolation of live, pressurised pipelines.

Dual BISEPs™ can be used to provide mid-line isolation of pipeline sections and the introduction of a bypass line allows sectional isolation to take place without the need to shut down the entire system or affect production.

Tecno Plug™ - Non-intrusive Inline Isolation

The Tecno Plug™ provides fail-safe double block and bleed isolation of high pressure pipelines while the system remains live and at operating pressure. Dual seals provide a zero-energy zone to enable maintenance work to be carried out on pressurised systems safely and efficiently. Piggable isolation tools require no welding or cutting into live lines, leaving no residual fittings or hardware on the pipeline.

STATS Group also recently launched a new microsite within Business Review Webinars, which you can view by clicking here.

Key Learning Objectives

  • Overview of double block and bleed pipeline isolation tools that enable safe repair of pressurised pipelines
  • Discuss mechanical isolation tools and techniques developed for piggable and unpiggable pipeline systems
  • Benefits of double block and bleed pipeline isolation and examples of repair or modification scenarios
  • Case study highlighting a subsea pipe repair successfully executed, without depressurising the entire gas export pipeline


  • 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
  • Pipeline Engineer
  • Integrity Engineer
  • Subsea Pipelines
  • Subsea Engineer
  • Emergency Pipeline Repair Manager