Quantitative Risk Assessment for LNG Offshore Central Processing Facility in Australia

Geosyntec prepared the quantitative risk assessment (QRA) for the Browse liquified natural gas (LNG) offshore central processing facility (CPF) during the front-end engineering design (FEED) stage of this multi-billion dollar project.

Geosyntec Scope of Services:

The Browse LNG project is an LNG export facility being developed off Australia’s northwest coast. The facility will distribute gas from three gas fields, estimated to have reserves of 13.3 trillion cubic feet of dry gas and 363 million barrels of condensate, capable of supplying Australia’s current gas needs for 40 to 50 years. The project includes an onshore three-train LNG facility, 1200km of subsea pipeline, a CPF, and three dry tree unit (DTU) tension leg platforms. The CPF will be located in shallow water on the Australian North West Shelf. The facility will receive well fluids from three infield deepwater production facilities, process the received gas and condensates, export the processed hydrocarbons to a Greenfield LNG plant located at James Price Point on the Dampier Peninsula, north of Broome, Western Australia. An Excel-based linked spreadsheet model, containing all the elements of a QRA and supported by visual basic for application (VBA) code, was developed for this project. This was to satisfy the clients key requirements, which were to develop a QRA model that: Supported a comprehensive assessment of the risks on the CFP platform to support the demonstration that the risks are both tolerable and are low as reasonably practicable (ALARP) and has sufficient detail to support the project’s evolution through detailed design and into the operational phase.

Notable Accomplishments:

This QRA determined the risks for a number of manning scenarios for three different operational phases of the installation, which took account of additional tie-backs and processing facilities for both hydrocarbon and non-hydrocarbon hazards. The assessment also determined the risks to personnel undertaking operations and maintenance visits to the DTUs. The model was developed to determine the risk measures as defined by the client: potential loss of life; area specific individual risk per annum; individual risk per annum; temporary refuge impairment frequency; and the bridge impairment frequency. The advantages of this model, which was handed over to Fluor and Woodside Engineering Limited (WEL), are that it is easy to use, transparent, and allows the rapid assessment of any changes. In addition to preparing the QRA model for the CPF, Geosyntec also undertook peer reviews of the QRAs developed in parallel by MODEC and Aker Solutions for the DTUs during front-end engineering design (FEED).

Project Overview

  • Location: Australia
  • Client: Confidential
  • Project Practice Areas: Civil Site Engineering and Design, Facility Hazard Definition and Risk Management
  • Type of Facility: Offshore Central Processing Facility
  • Type of Work: Quantitative Risk Assessment
  • Company: MMI Engineering

Our Consultants

  • Chris Robinson, Ph.D., CEng, MIMechE

    Chris Robinson is a Principal Engineer based in England, with more than 23 years of professional experience focused on fluids systems engineering, computational fluid dynamics (CFD), gas dispersion, and aerodynamics. This experience has been developed through work in Government, academia, and 15 years of consultancy experience across a wide range of industries. Chris' practice uses CFD to optimize waste water and drinking water processes. He has performed design and design assurance ...
  • David Sanderson, CEng

    David Sanderson is a Senior Principal Engineer based in England with more than 20 years of experience focused on process safety, structural integrity and reliability, complex finite element analysis, structural mechanics (dynamics and non-linear), and multimedia communication of complex technical issues. Key projects and client services undertaken by David include: development of integrity assurance schemes for two BP North Sea platforms; development of monitoring schemes for offshor ...
  • Andrew Nelson, CEng

    Andrew Nelson is a Senior Principal Engineer based in Australia with more than 20 years of experience in technical safety engineering and risk management. His practice is focused on hazardous industries including upstream and downstream oil and gas. He co-developed Geosyntec's major hazards assessment capability and supported the development of Geosyntec's major hazards engineering team. Andy's primary areas of interest are quantifying the effects of fires and explosions and developin ...
  • Simon Thurlbeck, Ph.D., CEng

    Simon Thurlbeck is a Senior Principal Engineer based in England with more than 30 years of structural engineering and research experience focused on fire and explosion risk management for high-hazard industries including upstream oil and gas. Simon's practice includes risk identification, hazard modelling, and the assessment, design, and specification of systems to mitigate the effects of major hazard events. Simon also conducts and manages beyond-design studies such as ship impacts, ...
  • Alastair Painter

    Alastair Painter is a Senior Principal Engineer based in Texas with more than 30 years of experience in the areas of technical safety, reliability and performance assessment applied to facilities utilized in the upstream, midstream and downstream segments of the energy sector. He has applied his expertise to a diverse range of facilities, including drilling rigs, subsea oil and gas production, offshore process facilities, liquefied natural gas (LNG), refineries and petrochemical ...
Geosyntec Consultants
Geosyntec is a specialized consulting and engineering firm that works with private and public sector clients to address new ventures and complex problems involving our environment, natural resources, and civil infrastructure.

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