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The Chevron Explosion 2011 – Electrical, Control & Instrumentation Investigation

Author : Presenter: HSE Specialist Inspector Peter Evans

15 October 2019

This presentation will explore the Electrical, Control and Instrumentation elements of the investigation into the fatal incident at Chevron’s Pembroke oil refinery on June 2, 2011.

The presentation will focus on the EC&I aspects of the investigation, such as gas testing, electronic data recovery and analysis (, earthing & bonding, portable electronic devices and hazardous area classification. It will also show some interesting videos and images.

As this is a very recent investigation – it concluded on June 6, 2019 after 8 years of complex forensic HSE and police work – final content is still being decided and we will update this entry when it has been signed off. 

Peter Evans

Peter Evans joined HSE in 2005 as an Electrical, Control and Instrumentation (EC&I) Specialist Inspector of HSE’s Chemicals, Explosives and Microbiological Hazards Division. Before joining HSE he worked for over 17 years in the field of Electrical Engineering at various COMAH establishments, across South Wales. He is a focused and committed Chartered Engineer (CEng) and a Member of the Institute of Engineering & Technology (IET).

He is actively involved in the review, development, standardisation, regulation and enforcement of relevant good practice, key benchmark standards, European & International Standards, Codes of Practise and other sector specific guidance etc. associated with Electrical Equipment used in Potentially Explosive Atmospheres. He was involved with the Buncefield investigation at Hemel Hempstead in Dec 2005 and was the Lead EC&I Inspector for the Chevron Refinery explosion in June 2011.

Peter Evans, HSE Specialist Inspector
Peter Evans, HSE Specialist Inspector

He is also responsible for providing HSE representation on EXL/031/03 – codes of practice and a myriad of other external stakeholders, trade associations, technical committees and professional bodies (e.g. EI, BSI, EEMUA, IET, CompEx, NICEIC etc.). He has a unique skillset of both technical and legal expertise and excellence that is indispensable within the professional field of Engineering.

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