Optimise Bureau Veritas Monte Carlo Simulator

LAYER-OF-PROTECTION-ANALYSIS-(LOPA)

Semi-quantitative tool designed for ALARP risks & SIL allocation

WHY CHOOSE BUREAU VERITAS?

Bureau Veritas Services

LAYER OF PROTECTION ANALYSIS (LOPA)

Semi-quantitative tool designed for ALARP risks & SIL allocation 

 

BUSINESS CHALLENGE

The process industry has to provide and maintain a safe working environment for its employees. Safety is provided through inherently safe design and safeguards such as instrumented systems, procedures, and training. These safeguards should be designed in a way to avoid over or under protected process risk for safety and financial reasons. Layer of Protection Analysis (LOPA), conducted with independent assessment, is a powerful tool to reach an effective design 

 

SOLUTION

What is LOPA?

LOPA is a semi-quantitative tool. As a risk assessment methodology, LOPA uses order of magnitude categories for initiating event frequency, consequence severity, and the likelihood of failure of independent protection layers (IPLs) to estimate risks. Objectives of LOPA are to determine if risks can be tolerated by asking:

·       Are there sufficient layers of protection against an accident scenario? 

·       Are supplementary independent protection layers needed?

 

WHY CHOOSE BUREAU VERITAS? 

Bureau Veritas can assist you in gaining the full benefits of a LOPA such as:

·       Time-saving compared to full quantitative risk assessments (QRA);

·       Comparison of risks from unit to unit if common approach is used; 

·       Use of ALARP principles;

·       Basis for functional specification of SIS (IEC 61508 and IEC 61511);

·       Protection layer operation, maintenance, and related training optimisation; and 

·       Assistance for Safety requirement Specification (SRS) writing.

                                                 

Optimise Bureau Veritas Monte Carlo Simulator

OUR APPROACH

Bureau Veritas has several consultants with international experience in conducting workshops and managing LOPA and risk analysis processes.  Following a complete understanding of the system, often after carrying out preliminary risk assessments to determine the functioning of the installation,a workshop session with the client’s teams is held to handle the LOPA. The conducted LOPAs will be compliant with the appropriate industry standards, while at the same time customized to our clients’ needs.








FAQ – FREQUENTLY ASKED QUESTIONS

How long does a LOPA analysis take?

This depends entirely on the complexity of the analysed system and the level of detail one wishes to achieve. LOPAs can extend from one day to several weeks in correlation with HAZOP duration.

Can a LOPA be integrated into a Hazard and Operability study?

LOPA is a semi-quantitative risk analysis technique generally used after HAZOP. Facilities are increasingly integrating their HAZOP analyses with their LOPA studies, primarily because of the many benefits: a qualified group is already convened; study time is reduced; common databases can link causes, consequences and safeguards; and cost savings are realized.

Can you also use a risk matrix or a calibrated risk graph?

Yes. Bureau Veritas has already worked with such tools on numerous missions.

What is the next step?

After SIL allocation, safety requirements specifications should be written and SIL verification performed during design phase.


Contact Us

Bureau Veritas

+33 1 55 24 70 00

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