October 2020

Special Focus: Plant Safety and Environment

When toxic risk cannot be prevented, mitigate consequences of H2S with fluid curtains

Toxic risk preferably should be controlled according to Kletz’s inherent safety principle, which consists of some preventive golden rules, notably minimize, substitute, moderate and simplify.

Benintendi, R., Megaris, Ltd.

Toxic risk preferably should be controlled according to Kletz’s inherent safety principle,1 which consists of some preventive golden rules, notably minimize, substitute, moderate and simplify.2 In some instances, these actions are not implementable or enough to effectively reduce risk. This can happen with process streams containing significant amounts of hydrogen sulfide (H2S), when either the likelihood of loss of containment cannot be sufficiently minimized or when consequences are so catastrophic that they require some mitigation measures independent of the formal compliance with the ALARP (as low as reasonably achievable) criterion. A resolutive toxic inventory reduction that is accompl

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