The revolutionary concept of offshore LNG installations (FLNG) is said to have economic and environmental advantages. A distinct disadvantage however is that the risks to health and safety of persons employed offshore on the LNG FPSO’s, such as Prelude, will be higher, when compared to onshore LNG plants of similar capacity, specifically the potential for loss of life; …loss of containment of hydrocarbons is likely to occur on Prelude during its operational life, either through flaws in the design, human error or failure to inspect and maintain. It’s almost inevitable. It’s only to be hoped that the consequences of these losses never reach their full potential.
By Bill Campbell, Retired HSE Group Auditor, Shell International
Prelude FLNG turns conventional wisdom on its head
The revolutionary concept of offshore LNG installations (FLNG) is said to have economic and environmental advantages. A distinct disadvantage however is that the risks to health and safety of persons employed offshore on the LNG FPSO’s, such as Prelude, will be higher, when compared to onshore LNG plants of similar capacity, specifically the potential for loss of life.
This article concentrates on the perfect contradiction that exists between managing risks on an onshore LNG plant when compared with floating LNG. Whereas onshore plants, handling hazardous substances reduce risk by physical separation, such separation, although attempted on Prelude would not be accepted onshore because the separation distances are inadequate. Prelude will store high quantities of cryogenic hydrocarbon liquids on the installation. The heat energy of the liquids is enormous. This contradicts the £6 billion or so expenditure in the North Sea, post Piper Alpha, to do as much as reasonably practicable, to reduce the heat energy available so that escalation of hydrocarbon events are limited such that the Temporary refuge (TR), normally the Living quarters, and including escape routes to the TR and evacuation from it, will not be impaired within one hour to allow safe evacuation of the facility. The frequency of TR impairment should be demonstrated to be no more than once in 1000 yrs. It’s a high standard to achieve. read more
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