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Over the past 30 years, Process Risk consultants have performed hundreds of PHA studies in all industries using these and other methodologies. Our world-wide experience ranges from project PHAs, FEED phase studies through design stage PHAs, re-dos and revalidation PHAs, Management of Change (MOC) PHAs as well as procedural PHAs. We have expertise with all industries and systems. We also perform advanced level studies such as Layer of Protection Analysis (LOPA) and a full range of Safety Instrumented Systems (SIS) services.