Welded pipes are under scrutiny in San Francisco gas-blast probe

12/14/2010 | Wall Street Journal, The

Officials investigating September's gas explosion near San Francisco say the piping used at the site wasn't the kind that utility PG&E had on record. The pipeline should have been constructed of seamless steel, but investigators found that sections had been welded lengthwise. Company officials noted that both seamed and seamless piping were intentionally used in the utility's distribution network, and there was no immediate suggestion that the welded piping was responsible for the disaster.

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Wall Street Journal, The