Last summer’s Con Edison Steam Pipe Explosion in New York City was the result of shoddy repairs performed by the utility company. A clump of sealant probably caused the deadly July 18th steam pipe explosion in midtown Manhattan, Consolidated Edison, said. Con Ed spokesman Michael Clendenin said Wednesday that the clog came from epoxy resin injected into the pipe four months before the blast. The epoxy sealed a flange, or seam, connecting two segments of steel pipe and some epoxy got into a valve, leading to a buildup of pressure that ruptured the pipe. The condition, known as “water hammer,” can result when water condenses in a closed section of pipe; the sudden mix of hot steam and cool water can make pressure surge. The findings drew a scathing response Thursday from City Councilman and Con Ed critic Eric Gioia, who noted the utility pointed at the city as potentially responsible for the blast.
In October Con Ed blamed city sewers, pipes and drains for leaking cold water onto the hot steam pipe and filed a $25 million notice of claim—the first step toward a lawsuit—against the city. “They’ll do anything they can to deflect blame and avoid taking responsibility,” Gioia said. “But now this report shows that Con Ed’s poor maintenance contributed to this deadly explosion.” There have been over a dozen steam pipe explosions in the city in the last 20 years.

