The original HAZOP methodology developed by ICI has been expanded over time. Mike McKay and George Watson believe the eight study stages provide the perfect blueprint to identifying potential Natechs
HOW MANY of us ignore extreme weather events as they are invariably “somewhere else” and so don’t affect us? Certainly, that was our response until early 2023 when we were revalidating a hazard study for an oil storage terminal in South Africa.
During the study we discovered that the site had been submerged in 2022 by flood waters up to 1.8 m in depth. This destroyed the site electrical infrastructure as well as damaging many of the plant’s instrumented safeguarding systems. Fortunately, the flooding did not cause any significant spill of oil. But 18 months after the floods, the site is still operating with temporary measures in place to manage the risk. However, other operators have not been so lucky and there are numerous incidents around the world where a major accident hazard has occurred as a direct result of extreme weather.
Many articles have been published describing the threat that extreme weather poses, often under the banner of Natech, or Natural Hazards Triggering Technological Accidents. Several of these articles describe measures that can be implemented to mitigate the effects. However, if our perception remains that extreme weather won’t affect me then nothing will change until it is too late.
While some sectors, such as nuclear, are addressing the threat of extreme weather, the wider chemical industry is lagging. On completion of our study, we asked ourselves, “Could we identify the risks that extreme weather poses through hazard studies?”.
A hazard study 2, or HAZID, is an obvious place to assess threats posed by extreme weather effects. Its purpose is to identify significant hazards, both on-site and off-site, and ensure that there are appropriate measures either to eliminate or reduce the risk to a tolerable level. The study uses guidewords to facilitate discussion. These guidewords can easily be adapted to consider extreme weather events:
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