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Layer of Protection analysis LOPA is a simplified quantitative tool for analyzing and assessing risk. LOPA was developed by user organizations during the s as a streamlined risk assessment tool, using conservative rules and order of magnitude estimates of frequency probability and consequence severity. When the method was shown to be an efficient means to access risk, several company published papers describing the driving forces behind their efforts to develop the method, their experience of LOPA and examples of their use.
In particular, the papers and discussions amount the attendees at the Center for Chemical Process Safety CCPS international conference and workshop on risk analysis in Process safety in brought agreement that a book describing the LOPA method should be developed. The minimum combination of failures or errors necessary to start the propagation of an incident sequence.
See Initiating Events. An independent protection layer IPL is a device, system, or action that is capable of preventing a scenario from proceeding to its undesired consequence independent of the initiating event or the action of any other layer of protection associated with the scenario. See Independent Protection Layers. Learn about Conditional Modifiers.
Learn about Enabling Conditions. Skip to main content. All Education. All Events. Member Organizations. Propose a Project. All Tools. All Publications. Toggle site search visibility. LOPA Data. What is LOPA? Initiating Events The minimum combination of failures or errors necessary to start the propagation of an incident sequence. See Initiating Events Independent Layer of Protection An independent protection layer IPL is a device, system, or action that is capable of preventing a scenario from proceeding to its undesired consequence independent of the initiating event or the action of any other layer of protection associated with the scenario.
Learn about Conditional Modifiers Enabling Conditions Enabling conditions are situations which must occur simultaneous with a given initiating event to allow the specific cause for a scenario to propagate to a consequence of interest. Consists of an operation or condition that does not directly cause the scenario, but that must be present or active in order for the scenario to proceed to a loss event Not all LOPA have enabling conditions Learn about Enabling Conditions Note: Not every LOPA have enabling condition and conditional Modifiers.
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Layer of Protection Analysis: Simplified Process Risk Assessment
See more resources. The course covers the basic LOPA approach to selecting and analyzing potential incident scenarios. You will learn the finer points of topics such as enabling conditions and conditional modifiers, and the logistical aspects of planning and executing a LOPA study including documentation and program management. More info. Johnson is a Fellow of AIChE and an industry leader in the development and dissemination of risk analysis methods and risk management strategies. Since , Mr.
Guidelines for Initiating Events and Independent Protection Layers in Layer of Protection Analysis
Layer of protection analysis LOPA is a recently developed, simplified method of risk assessment that provides the much-needed middle ground between a qualitative process hazard analysis and a traditional, expensive quantitative risk analysis. Beginning with an identified accident scenario, LOPA uses simplifying rules to evaluate initiating event frequency, independent layers of protection, and consequences to provide an order-of-magnitude estimate of risk. LOPA has also proven an excellent approach for determining the safety integrity level necessary for an instrumented safety system, an approach endorsed in instrument standards, such as ISA S84 and IEC Written by industry experts in LOPA, this pioneering book provides all the necessary information to undertake and complete a Layer of Protection Analysis during any stage in a processes' life cycle. Loaded with tables, charts, and examples, this book is invaluable to technical experts involved with ensuring the safety of a process.
CCPS LOPA Independent Protection Layers
Layer of Protection Analysis (LOPA)