On september 9, 2010 a Pacific Gas & Electric 30 inch natural gas pipeline exploded into flames in San Bruno, California. It took an hour to determine it was a gas pipeline explosion, the dead toll was eight people and 38 houses destroy. the cause was numerous defective welds in the pipeline; some weld did not penetrate the pipe. As PG&E increase the pressure the defective welds were weakened until their fail. That a example of how IMP can fail as a safety program when the company's program is inadequate, PG&E lacked sufficient records on which to base its threat identification because it failed to maintain records showing the kind of pipe or quality of weld, The inspection need to verify the truth of the operator's records, not just blindly
