Domestic and industrial natural gas is typically 90 percent methane, said Isaac Zlochower, a research chemist at the U.S. Centers for Disease Control and Prevention who has studied explosions of methane and other flammable gases but was not involved in the probe of the Pemex blast. If concentrations of methane in the air are 5-16 percent, an ignition source can cause an explosion."The issue is primarily to ensure that you don't have a flammable gas air mixture in a confined space," he said. "It's much harder to ensure that there isn't an ignition source."
Heating System Suspect In Mexico Oil Company Blast
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