If you used LOPA to determine if you need a SIF and to identify what SIL is required (if any), then you cannot share or partially share a final element. So, if the BPCS control loop is the cause (initiating event) and that loop uses the final element in question, then that same final element [...]
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 [...]
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, [...]
Before the OSHA PSM standard became official (May 1992), OSHA said that they would not use 3rd party or even first party (internal audits) of PSM against a company, but then they add "initially". When asked by us what this meant, they said the first few years of implementation of PSM; this was to encourage [...]
Firstly, you cannot "write a PSM" .... I'm not even sure what that would be. PSM is a not a document for compliance like some environmental studies. PSM, if done correctly, is a way to run a business. If developed and implemented right, it will control the human factors that control the human error that [...]
