Tales of the Unexpected – When the party ended with a bang!: 3rd in a series of articles by Bill Campbell (right), retired HSE Group Auditor, Shell International, about safety issues relating to the Shell Prelude FLNG project
Thus methane-air explosions are unpredictable, and by definition unpredictable events take you by surprise and can occur when you least expect them, and often when you are least prepared. And unfortunately, from time to time, these unpredictable events can have catastrophic consequences as history tells us.
By Bill Campbell
LNG is natural gas (methane) refrigerated, the chilling process eventually turning the gas into a liquid shrinking its volume by 600 times. As we are aware from elementary physics, energy cannot be created or destroyed, so the whole economic model of the use and transportation of LNG worldwide, which really started in the 50’s and is due to exponentially expand in the next decade, is that the heat energy contained in one metre cubed of the liquid equates to six hundred metres cubed of methane. So the physical characteristics of liquified natural gas is what makes it economically viable in its transportation over in some cases many thousands of miles from its source to where it will be used when converted again into its natural state. But it’s this conversion that can make it so dangerous should it spill or leak into the atmosphere accidentally.