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Decommissioning Studies

Decommissioning is the final stage in the asset lifecycle. Atteris provides engineering services to clients for the decommissioning phase of subsea and pipeline infrastructure, which may include:

  • Concept and option studies
  • Cost and schedule estimate
  • Method statements and story boards
  • Risk assessments
  • Comparative assessments
  • Degradation assessments

Atteris also considers the decommissioning phase in our designs and operations planning as part of our total cost of ownership (TCO) way of thinking.

When it comes to the execution phase, our project engineers are available to support site-based and offshore works.

Service Area Specialist
Allison Selman facing the camera
Allison SelmanAsset Lifecycle Manager

Allison is the discipline lead for asset lifecycle assessments of offshore and onshore infrastructure.

Comparative Assessments

Comparative assessments help operators make informed decisions when selecting decommissioning options.  They consider technical feasibility, project economics, health and safety impact, the environment, stakeholder concerns, the available supply chain and the energy that will be consumed.

The options available for each component are assessed: leave in-situ or remove and dispose, recycle or re-use.

Comparative assessments apply a systemic process to perform an objective evaluation of the technically feasible options. The objective to arrive at a balanced decision that satisfies or exceeds expectations of the regulators and stakeholders.

Degradation Assessments

Atteris is experienced in performing materials degradation assessments to determine the long-term behaviour of infrastructure that are left in-situ.

We describe the degradation process of each component with scientific justification and establish an indicative timeline that can be used to communicate with stakeholders. Our degradation assessments provide valuable insight into the decommissioning decision-making process. When executed in conjunction with an environmental impact and fate assessment, valuable insights are gained on the impact of assets that are left in-situ.

Environmental Studies

Atteris partners with MCC Environmental, who support our projects with providing environment, climate, sustainability and stakeholder engagement services.

Key considerations of any decommissioning activity include how it might impact the environment and identifying methods to manage this impact throughout the decommissioning process. For the degradation assessments, the constituents of concerns are identified and their persistence, bio-accumulation and toxicity (PBT) are assessed.

MCC Environmental services include stakeholder engagement and management plans, environmental impact and fate assessments, ENVIDS, environmental plans, sustainability and energy assessments.

Research and Development

Atteris understands the importance of supporting industry research and development initiatives to progress knowledge and technology development. Our work in decommissioning includes:

  • Delivery of the Offshore Pipeline Decommissioning Engineering Guideline for the Energy Pipelines Cooperative Research Centre (EPCRC) arm of the Australian Pipeline and Gas Association (APGA) that was reviewed by the decommissioning committee of the Australia Petroleum Production and Exploration Association (APPEA)
  • Support to the National Decommissioning Research Initiative (NDRI) which was established to improve community, regulatory and industry understanding of the impact of infrastructure on the marine environment.