Risk Matrix

Risk Matrix

0:06
Welcome to this Application Explainer video, part of our low per topic range.

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In this video we’ll cover the subject of the low per risk matrix in SLM.

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As an organization is vital to understand the risk, SLM uses the low per risk matrix to show the current mitigated risk a company or facility is taking on.

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This provides quick and valuable insight into which risks can be accepted versus the risks that need further mitigation.

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The following information will be covered in this training.

0:35
Chapter one will be an overview, Chapter 2 will be populating the risk matrix and Chapter 3 will be connections in SLM.

0:47
In Chapter 1, we will cover the purpose of the risk matrix and finding the DRM.

0:54
The LOPA Dynamic Risk Matrix, or DRM, displays current risk in the enterprise site or unit by locating the LOPA scenarios at your risk matrix.

1:05
It’s displayed at each of these three layers by the LOPA DRM tab.

1:10
Though similar to the Hazop DRM, the Hazop DRM displays each unmitigated scenario, while the LOPA DRM will display fewer scenarios as each LOPA contains potentially multiple HAZOP scenarios since the LOPA considers multiple causes of a consequence.

1:28
Remember that each LOPA is calculated to determine if a scenario is sufficiently mitigated for the severity levels TMEL for each severity category through the LOPA results calculation.

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More can be seen on this LOPA result calculation in the LOPA Calculations video.

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To get to this point of the LOPA result, the system must record for each LOPA the severity and the overall likelihood for each severity category.

1:57
Because of this, SLM can place the scenario on your risk matrix appropriately.

2:03
Further, you can specify the view of the DRM for only a specific severity category by selecting the category from the report parameters with the severity selection.

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Here, for each severity category, selecting it, clicking the equipment and clicking Generate will allow you to see which scenarios apply to that particular consequence category.

2:33
To understand the purpose of the DRM, just keep in mind that it is a visual report to quickly view how many scenarios are over an acceptable risk tolerance.

2:43
With links to navigate directly to the Lopez DRM references.

2:52
In Chapter 2, we will cover the risk matrix layout.

2:55
How Ipls affect the risk matrix and classifying a local worksheet as a loper of record.

3:02
The dynamic risk matrix displays the mitigated risk for all hazards in a given enterprise site or unit.

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The severity ranges show vertically, while the likelihood and frequency are shown horizontally at the top and bottom, respectively.

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The DRM displays the mitigated likelihood for that hazard after Ipls have been applied.

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Each cell in the matrix shows the number of hazards for that particular severity and mitigated likelihoods combined.

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The hazards will move to less risky cells based on the reduction in the likelihood which is affected by the PFD for the IPO or barrier.

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The lower the PFD, the more the hazard will move in the direction of the lower frequency.

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Clicking on that number reveals information displayed on the LOPA worksheets, such as the hazard, the severity and likelihood, the LOPA worksheet ID, the description, the equipment, the LOPA gap, and which barriers are protecting that equipment with the corresponding functions.

4:15
Clicking on the blue bar provides further filtering options to narrow down results by unit severity class.

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And equipment to be included and scenarios affected by the barriers that are currently placed in bypass.

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Only low per worksheets marked as low per of record will populate the DRM.

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There are two ways to mark a low per worksheet as a low per of record.

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The first way is to navigate to the LOPA worksheet and on the 1st tab, click the LOPA of Record checkbox.

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The second way allows you to mark multiple worksheets as a LOPA of record all at once.

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Navigate to the LOPA study, click on the LOPA sheet list and find the column marked LOPA of Record.

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Here you can change all of these worksheets at once, and when you’re finished with the appropriate settings, click Save Changes.

5:25
In Chapter 3, we’ll cover connections to the global module, connections to the Hazop module, and connections to the Operate and Maintain module.

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There are three main connections to other modules in SLM Global module, the Hazop module and the Operate and Maintain module.

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First connections to the global module.

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Here you can see the severity of the Loper worksheet by the consequence categories and this determines the target mitigated event likelihood for each of those consequence categories.

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Also, you can see the initiating event frequency or initiating cause likelihood.

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Both of these values are predetermined by the Risk Matrix setup in the Global module.

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Navigating to a site or unit, I’m going to the Risk Matrix Setup tab.

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First, the severity values.

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For each of the severities, a target likelihood can be assigned.

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For the likelihood values from HAZOP and LOPER, initiating cause likelihood can also be automatically assigned.

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For more on how to set up this risk matrix in the Global module, see the Global module video on Risk Matrix Setup.

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Next, how do you find the corresponding HAZOP scenarios for a given local worksheet?

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Navigate to a local worksheet.

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In the Local module, click on the Show HAZOP scenario and Scroll down here to where you can see the risk ranking, the hazard register, and the cause likelihood.

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This information tells you where you will find it on the HAZOP risk matrix.

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Next, the Loper risk matrix is directly connected to the Operate and Maintain module.

7:19
In here, it’s connected to the bypass that allows users to see the effect of removing a barrier or an IPL by placing it in bypass, navigating to the site or the unit, and clicking on the PAR Bypass reviews.

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You can find any LOPA IPL that’s applied to a LOPA worksheet with a severity of 3-4 and five.

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It will display the scenario information here and at the very end of the row it will show the risk matrix, the bypass likelihood and the pre bypass likelihood for that same severity.

8:05
The one shows where the scenario falls with the IPL applied and the dot shows the increased risk taken by placing the IPL in bypass.