The use of flammable natural gas to clean pipes in industrial facilities will not be prohibited despite findings that the practice is "inherently unsafe," the Occupational Safety and Health Administration said in a briefing Thursday. The U.S. Chemical Safety Board, which made the recommendation after investigating a fatal explosion at a Connecticut power plant in February, has expressed disappointment over the ruling, arguing that OSHA's decision is inadequate to address the dangers brought by the practice.

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