Monthly Archive for: ‘September, 2013’

When to Use a Risk Matrix and Risk Tolerable Criteria

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We don’t recommend using a risk matrix during PHAs/HAZOPs. matrices are good tools to teach risk concepts, but in a well led PHA/HAZOP they reduce quality more than they increase quality. To see much more details, download and read this free paper: http://www.process-improvement-institute.com/_downloads/Optimizing_PHA-HAZOP_While_Maximizing_Brainstorming.pdf We use a risk matrix and a risk tolerance criteria only when doing a LOPA (to address …

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When should PHAs (HAZOPs, etc.) Be Performed During Major Projects?

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The short answer is you need to perform PHAs in phases, from conceptual stage, through preliminary and detailed design, and then complete these during the pre-commissioning stages (as mentioned by Bryan). The PHAs build upon each other and the completion of the final phase PHA becomes the Baseline PHA. The tools used change from phase-to-phase, with What-if and some high …

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