This question was posted elsewhere... The short answers: PHA/HAZOP (qualitative methods) with a good team of experts can judge the risk of 950 to 980 out of 1000 hazardous scenarios LOPA can help reach a risk-based decision on the rest QRA is almost never needed (though many times others will require you to use such [...]
Many of us do not consider PSM part of HSE. Yes, both are trying to save lives, but they attacked nearly independent issues in different ways. And they use staff with greatly different backgrounds. Further, PSM, if implemented right, will greatly reduce operational and quality losses, since it focuses in process improvements. HSE Example: For [...]
We do NOT use a risk matrix of any kind in the PHAs (HAZOPs) is we get our way. On 20% of the PHA/HAZOPs we do, we have to use a matrix and we manage such analysis as well as anyone can (we have led 10,000 PHAs/HAZOPs of entire units). But, yes in 1/2 of [...]
The question often raised is “Should LOPA be combined with HAZOP meeting.” To set the background, I'm one of the three originators of LOPA in the mid-1990s and co-authored the first textbook on LOPA (CCPS/AIChE, 2001) and am primary author of the second textbook issuing in a few months: Guidelines for Independent Protection Layers and [...]
The real issue is will your SIL 2 SIF lower the risk of the final consequence by a factor of 100 and similarly will your SIL 3 SIF lower the risk by a factor of 1000. If not, and if a SIL 2 or 3 SIF was required for your scenario to reach tolerable risk, [...]