LOPA Conditional Modifiers

Conditional Modifiers

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Welcome to this application Explainer video, part of our global topic range.

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In this video, we’ll cover the subjects of low per conditional modifiers in SLM.

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Like enabling events, conditional modifiers can be used to accurately assess and portray the risk for a given scenario or hazard and typically take on the value of probability associated with the consequence.

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The following information will be covered in this training.

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Chapter one will be conditional modifier overview and Chapter 2 will be application within the PHA study.

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In Chapter 1 we will cover the purpose of the global conditional modifiers, creating a new global conditional modifier and syncing between the enterprise and the site whilst conducting a LOPA.

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It is often the case that conditional modifiers may need to be considered while trying to properly assess and reduce the risk of a hazard occurring for a given scenario.

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It is possible that these values can be used inconsistently due to calculations being made on the spot or a transcription of errors from company or facility predetermined values.

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To address this, SLM provides a way to standardise all probability values for conditional modifiers across the entire facility at the site level or company at the enterprise level if needed, based on predetermined values established by the company.

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Once these global conditional modifiers have been created, they can easily be applied to any PHA, cutting down on facilitation time and increasing accuracy in scenario calculations.

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Conditional modifiers can be added at the Enterprise or Site objects depending on the level of granularity needed.

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If conditional modifiers will be standard across all sites in the company, the global conditional modifier should be added at the Enterprise level.

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If the type and value for the conditional modifiers differ from site to site, global conditional modifiers should be added at the Site level.

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To add conditional modifiers in the Global module, click on the Enterprise Oregon Site Objects Low per Conditional Modifiers tab and add Global Conditional Modifier.

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Here you can enter in the modifier, its description, and the probabilities.

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To copy global conditional modifiers from the enterprise to be applied across all sites on the Enterprise level, click on Sync Across Sites.

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To add it to one particular site, navigate to the Site object.

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Click on Low per Conditional Modifiers tab and then click Sync with Enterprise.

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This brings down the conditional modifiers and their probabilities from the enterprise to add to the current list at the site.

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However, note that if the consequence categories are different at the site than at the enterprise, then the probabilities may not be copied down.

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In Chapter 2, we’ll cover applying global conditional modifiers to the HAZOP study and applying global conditional modifiers to the LOPA study.

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In SLM, Conditional modifiers can be applied to scenarios in both the HAZOP and the LOPA module in a similar way.

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To proceed, in the HAZOP module, navigate to the desired HAZOP study and node on the Facilitation tab, scroll to the Conditional Modifiers section in the scenario.

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Click the Edit button to view a list of conditional modifiers for the scenario in the top section and conditional modifiers from the Global module in the bottom section.

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Check all conditional modifiers to be applied to the scenario and under Custom Actions, click Copy Global Conditional Modifier.

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Scrolling up shows that the new conditional modifier has been copied from below and is applied to the scenario to proceed in the local module, navigate to the Local module, expand the object tree to navigate to the desired local worksheet, and on the Applicable Values tab in the Initiating Courses section in the Custom Actions menu, click on Manage Conditional Modifiers, which will show a light box with the same information as mentioned previously in the Hazop module.

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Once again, the top section being which conditional modifiers are part of the scenario and the bottom section being your conditional modifiers listed in the Global Conditional Modifiers section.

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Check all conditional modifiers that apply and under the Custom Actions menu, click on Copy Global Conditional Modifier.

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Scrolling up shows that it makes a copy of that conditional modifier, which can then be applied to the local worksheet or scenario for both Hazop and local modules.

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Once the conditional modifiers are listed in the top section, they can be applied at the user and facilitator’s discretion, as shown here with the Yes value.