A 71-year-old cast-iron gas main is suspected as a possible cause of a natural gas explosion on Jan. 18 that killed a utility worker and injured five people. "There's always a concern about cast-iron pipe," Thomas Knudsen, chief executive of Philadelphia Gas Works, told The Wall Street Journal. The story cites federal data for Philadelphia Gas Works indicating 18 incidents from 1985-2008 involving cast-iron pipes "that resulted in death, injury or significant property damage." The utility, like others around the country, has been investing in recent years to replace old cast iron with new polyethylene pipe.
Cast iron pipe suspected in Philadelphia explosion
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