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Gas leak
In common usage, a gas leak refers to a leak of natural gas or other gaseous product from a pipeline or other containment into a living area or any other area where the gas should not be present. Because flammable gases may explode when exposed to flame or sparks, this situation is very dangerous to the general public. In addition to causing fire and explosion hazards, leaks can kill vegetation, including large trees, and may release powerful greenhouse gases to the atmosphere.
==Fire and explosion safety==
Pure natural gas is colorless and odorless, and is composed primarily of methane. Unpleasant scents in the form of traces of mercaptans are usually added, to assist in identifying leaks. This odor may be perceived as rotting eggs, or a faintly unpleasant skunk smell. Persons detecting the odor must evacuate the area and abstain from using open flames or operating electrical equipment, to reduce the risk of fire and explosion.
As a result of the Pipeline Safety Improvement Act〔(Text of H.R. 3609 (107th): Pipeline Safety Improvement Act of 2002 (Passed Congress/Enrolled Bill version) - GovTrack.us )〕 of 2002 passed in the United States, federal safety standards require companies providing natural gas to conduct safety inspections for gas leaks in homes and other buildings receiving natural gas. The gas company is required to inspect gas meters and inside gas piping from the point of entry into the building to the outlet side of the gas meter for gas leaks. This may require entry into private homes by the natural gas companies to check for hazardous conditions.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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