[austechwriter] Re: OT: How To...

You said:

> Gas and fuel pipelines have big safety valves at either end 
> and big storage tanks too. The cut to civilian consumers is 
> easy, emergency services always have access to supply. 

From memory, experience in the Canberra bushfires was that Emergency
services do not always have the ability to cut supply of gas services and
that the gas suppliers themselves were reluctant to cut supply due to the
work involved in re-establishing supply - apparently all lines have to be
flushed and meters checked before supply can be re-started. There were
numerous reports of household connections spewing ignited gas jets -
contributing to the number of houses destroyed.
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