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|Title:||Arizona Public Service Company, natural gas explosion and fire, Phoenix, Arizona, September 25, 1984.|
|All Authors / Contributors:||National Transportation Safety Board. Bureau of Accident Investigation.|
|Notes:||Misc. No.: NTSB/PAR-85/01.
Accession No.: 70740.
|Year:||June 12, 1985.|
|Publisher:||Washington, DC : The Bureau,|
|Class Descriptors:||LC Class No.: TN880.5 .U58 85/01|
|Corporate Author:||National Transportation Safety Board. Bureau of Accident Investigation.|
|Series:||Pipeline accident report; Variation: Pipeline accident report.|
The National Transportation Safety Board determines that the probable cause of the accident was the deterioration and ensuing rupture of a 1-inch-diameter ABS plastic pipe due to weakening from internal environmental stress cracking that resulted from a chemical reaction between the pipe and liquid entrapped in a low spot in the pipe, which allowed natural gas at 30 psig to escape from the failed pipe and to migrate through the adjacent soil into and under two apartments, where it accumulated and was ignited by the gas pilot of a furnace. Contributing to the accident was the failure of persons who had detected gas odors earlier to report those odors to the gas company or to the fire department. Also contributing to the accident was the absence of a gas company program to analyze the cause of leaks as they occurred.