The California utility whose gas line explosion in September killed eight people has disclosed that it is unable to find 8 percent of the key safety records required for monitoring its high-pressure pipelines.
As the Associated Press reports, Pacific Gas & Electric employees and contractors combed through 1.25 million gas transmission records that were kept in storage, but were not able to locate many of the pressure records — including some for segments of line 132, which exploded in San Bruno on Sept. 9.
In response to the disclosure about the missing records, the California Public Utilities Commission announced a proposal to require PG&E to provide regular safety updates, including reports on its high-risk pipelines, for the next four years. The regulatory agency also is expected to decide soon whether to conduct more exhaustive safety tests on transmission lines that pass through populated areas.
The missing records issue with the PG&E system was most severe with the older pipelines, with 10 percent of all lines installed before 1961 lacking the proper testing documentation.
PG&E, in addition to disclosing the missing records, said it will replace or perform pressure tests on 150 miles of piping on 24 lines in its network, including portions of line 132. It also will send devices called “smart pigs” through another 432 miles to search for flaws in the structural integrity of the pipelines.
Even in cases where the company has records, critics said, there is a a need to take extra measures to determine current safety levels. In December, the National Transportation Safety Board revealed that the company’s records about the 1956-era pipe in line 132 were wrong. Company paperwork indicated that the pipeline was seamless when, in fact, it was riddled with seams and defects.
“If you’re just saying that you have five years of records showing what the pressure was over time, I don’t know whether that means the level is safe,” said Rep. Jackie Speier, D-Calif., whose district includes San Bruno. “We now know that the San Bruno pipe was seamed, had a defective weld and probably other problems.”
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