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Some of the gas customers smelled no gas prior to the incident. Most of the gas lines now are plastic. Gas explodes when the concentration is between 5 % and 15 % in an enclosed area.
Not for nothing but I know someone and he lived through it, turned off the flame in his gas heater and then turned the gas back on. He sat in front of the heater with the gas on, beer in hand, and flicked his BIC until it went boom. House lifted two feet off the foundation. Guy not only ended up divorced, but was committed to boot. It could be some of these people are doing it themselves.
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