LOPA: Practical Application and Pitfalls
04 October 2023 - 05 October 2023
Layers Of Protection Analysis (LOPA) is a risk assessment method
used to determine the likelihood of a scenario occurring based on
existing safeguards in order to protect against identified hazard
scenarios and to identify any potential shortfall in
the risk reduction required to meet predetermined, risk-based
The Process Safety Leadership Group (PSLG) prepared specific
guidance for the applications of LOPA to determine the required
safety integrity level (SIL) for overfill protection of highly
flammable fuel bulk storage tanks at sites like Buncefield, which
was the location of a major incident in 2005.
This course will draw on that guidance, its relevance to LOPA
assessment in general and examples of pitfalls identified during
the assessment of many LOPA studies from the petrochemical
The course is presented by a member of the PSLG LOPA working
group that developed the LOPA guidance.
Delegates will be provided with information that will help them
- Know when to use LOPA or another more suitable method
- Know how to perform a basic LOPA
- Understand how to produce an effective LOPA, including
preparation for detailed LOPA assessment and risk assessment
- Be able to produce a meaningful LOPA study within their
What the course will cover
The course will begin by putting LOPA in perspective, looking at
its uses and its complexity, letting delegates know when to use
LOPA and when to consider other methods such as a Quantitative Risk
Assessment (QRA). Delegates will look at LOPA study prerequisites
and preparation, target frequencies, input data sources and
uncertainty. It will cover how to perform LOPA: LOPA rules and IEC
61511 requirements, scenarios, conditional modifiers, enabling
events and independent protection/mitigation layers. Delegates will
examine LOPA outcomes: regulator expectations and ALARP
considerations along with human factors. There are interactive
learning elements where delegates will look at example pitfalls
associated with LOPA and also consider case study examples.
Who should attend?
The course is aimed at those engineers, managers and safety
professionals who have a basic knowledge of risk assessment,
possibly gained through Hazard and Operability (HAZOP) studies and
Process Hazard Analysis (PHA) studies, and would like to have an
understanding of the LOPA method, how to apply LOPA and the
pitfalls commonly associated with this type of analysis.
Dr Colin Chambers CEng MIET has 15 years experience at HSE,
initially on the development of risk assessment methods for the
assessment of safety related systems such as the SIL determination
method in informative annex of BS EN 62061 and 11 years experience
of risk assessment within HSE and as a COMAH technical assessor. Dr
Chambers was a member of the PSLG working group that developed the
PSLG LOPA guidance and was part of the CA team charged with
assessing post Buncefield LOPA studies
Dr Chambers has written peer reviewed papers and HSE reports on
issues associated with LOPA and given numerous presentations at
venues in the UK and in Europe.
The course will be run at the HSE Science and Research
Centre in the spa town of Buxton.
Buxton is in the heart of the Peak District and has good links
to major roads and motorways, mainline train stations and
Manchester International Airport.
Details of hotels in the Buxton area can be found at www.visitbuxton.co.uk
£1,245 per person (includes course notes, lunch and
Please note that all courses must be paid for via credit
card at the time of booking.
Some of our training courses can also be delivered
in-company, please contact us to discuss your requirements.
Telephone: +44 (0)203 028 3704
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