The recent natural gas pipeline explosion in San Bruno, USA has raised an important point. It appears that the company employees had to drive through rush hour traffic for more than an hour to close manual valves to isolate the leaky pipeline.
In any pipeline transporting hazardous material, remotely operated emergency isolation valves must be provided to immediately isolate the supply of the hazardous material safely. Also, test them to ensure they are in operating condition.
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Your post is very informative. Hope that the gas pipeline today is well equipped with much stronger and sure valves.
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