Overpressurized Pipes Faulted in Massachusetts Blasts

A series of fires and explosions in Massachusetts last month was likely triggered by an error that caused a natural-gas pipeline system to become overpressurized, sending fuel into people’s homes, a preliminary federal probe has found.

The preliminary findings are in line with remarks made by NTSB Chairman Robert Sumwaltshortly after the incident that improper pipe pressure appeared to have caused the blasts.

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