BREAKING NEWS: FABIG LUNCHTIME WEBINARS TO BE HELD EVERY 2 WEEKS WHILST MEASURES AGAINST COVID-19 PREVENT THE ORGANISATION OF OUR TRADITIONAL TECHNICAL MEETINGS

Register now for our Lunchtime Webinar to be held on 13 January

17 December 2020

LUNCHTIME WEBINAR - 13th JANUARY 2021

We are pleased to inform you that our next FABIG Lunchtime Webinar will cover 'The benefits of blind benchmarking of Probabilistic Explosion Risk Analysis (ERA) studies' and will be given by Prankul Middha from Abercus on 13th January 2021 from 13.00 GMT.

For additional information and registration, please go to the Events section of the website.

Abstract:

Since the late 1990’s, the offshore industry has progressively moved towards a probabilistic methodology based on the use of Computational Fluid Dynamics (CFD) to characterise the risks associated with the delayed ignition of accidental releases of flammable gases in both onshore and offshore facilities. The probabilistic methodology outlined in the NORSOK Standard Z-013 has emerged as the prevalent approach.

However, standards such as NORSOK Z-013 only provide a high-level outline of the probabilistic Explosion Risk Analysis (ERA) methodology. There is currently no industry guidance describing the probabilistic ERA methodology in a comprehensive and detailed manner. As a consequence, it should be recognized that there are inevitably variations in the approaches used by different parties on projects.

Furthermore, there can be significant uncertainties in the inputs to the probabilistic ERA, for instance the release frequency data assumed for the gas dispersion analysis, and the ignition probability model assumed for the explosion analysis. Other parameters such as the treatment of the release profile and the definition of the flammable gas cloud also play an important role. Several recent independent reviews of probabilistic studies have shown that, depending upon the assumptions made regarding these inputs, the design blast load may vary significantly.

Such a lack of consistency is a significant point of concern as it could lead to safety critical elements (for example, blast walls, decks and vessel supports) being either over or under-designed. This issue has been raised by various regulators including the UK HSE and Norwegian PSA. There are many different parties offering probabilistic ERA studies and as such, there is an urgent need to establish whether such work is carried out in a consistent manner across the industry.

This webinar will review the various sources of uncertainty in probabilistic ERA, and outline a proposed Joint Industry Project, the PROBABLAST JIP, that involves a blind probabilistic ERA inter-comparison exercise and aims to:

  1. Identify inconsistencies in probabilistic ERA approaches across the industry;
  2. Share experience and learnings in the public domain;
  3. Help develop good practice guidelines.
FABIG WEBINAR SERIES

We will be organising lunchtime webinars every two weeks whilst working life remains disrupted by measures to combat the COVID-19 epidemic. Such measures either prohibit or make inadvisable large meetings such as our Technical Meetings.

We are now looking for presentations covering topics relevant to the following themes:

  • Robust Principles for Safe Design against Fires & Explosions based on Experience;
  • Fire and Explosion Hazards from Low Carbon Energy Sources (we are also looking for presentations covering related incidents).

As such, please do not hesitate to contact us at fabig@steel-sci.com if you or one of your colleagues would like to give a relevant presentation.

Take care and stay safe,

The FABIG Team

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