By Tim McLaughlin
BOSTON (Reuters) - Thousands of miles of natural gas pipelines in Massachusetts are leak-prone and need repair, utilities have told state regulators, highlighting ageing energy infrastructure risks after explosions ripped through three towns outside of Boston this week.
Federal investigators will examine pipeline maintenance in their probe into the Thursday night blasts in Lawrence, Andover, and North Andover, Robert Sumwalt, chairman of the National Transportation Safety Board, said on Friday. The explosions on a pipeline system belonging to Columbia Gas of Massachusetts destroyed scores of homes, killed one person and injured more than a dozen others in the largest natural gas pipeline incident in nearly a decade.
The investigation could provide insight into the nation's ageing pipeline infrastructure. Roughly half of the 2.4 million miles of pipelines crisscrossing the United States were installed before 1970, said Deborah Hersman, chief executive of the non-profit National Safety Council and a former chairman of the National Transportation Safety Board.
Columbia Gas, a unit of NiSource Inc
Columbia Gas and other utilities say the Massachusetts natural gas distribution system is one of the oldest in the United States, with sections built more than a century ago. The company told regulators that it repairs more than 1,200 leaks a year, on average, mostly on its main line pipes.
In 2016, for example, replacing leak-prone pipes was expected to cost it about $56 million.
Columbia had told customers it was conducting upgrades on parts of its system shortly before the explosions.
The company was not available for comment.
Columbia Gas has had a clear safety record for more than a decade in Massachusetts, though a pipeline rupture in West Virginia in 2012 triggered an explosion that destroyed three houses, according to records from the National Transportation and Safety Board and the Pipeline and Hazardous Materials Safety Administration.
Other Massachusetts utilities are also racing to make upgrades.
Boston Gas, a unit of National Grid, replaced 107 miles of leak-prone pipes in 2016, disclosures to regulators show. But the utility has said it does not expect to have all of leak-prone pipes replaced until 2039.
Democratic Senators Ed Markey and Elizabeth Warren urged a Congressional investigation into the explosions to prevent any recurrence, according to a joint statement released on Friday.
Investigators suspected "over-pressurisation of a gas main" was a factor in the incident.
(Reporting By Tim McLaughlin; Additional reporting by Collin Eaton in Houston; Editing by Richard Valdmanis and Richard Chang)
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Updated Date: Sep 15, 2018 01:06 AM