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petroleum gases

Definition

Ethane, ethylene, propane, propylene, normal-butane and isobutane, butylene (butene) and isobutylene (isobutene), stored and transported as liquid under pressure. All have ignition points above 430°C (806°F) but extremely low flash points—below –70°C (–100°F)—and are non-toxic unless their concentration in air reaches 1000 parts per million (PPM). Also called refinery gases.

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