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Safety Recommendation Details

Safety Recommendation P-70-041
Details
Synopsis: ON NOVEMBER 6, 1969, DURING A HIGHWAY CONSTRUCTION PROJECT IN BURLINGTON, IOWA, A BULLDOZER WEIGHING 70,000 POUNDS DROVE OVER AND PARTIALLY COLLAPSED THE STEEL COVERS OF A GAS REGULATOR PIT, DAMAGING THE REGULATOR. WHILE THE PRESSURE WAS PARTIALLY CONTROLLED BY A MONITORING OR SAFETY REGULATOR, GAS, REPORTEDLY AT FOUR TO FIVE TIMES THE NORMAL OPERATING PRESSURE, ENTERED THE DISTRIBUTION SYSTEM. GAS CUSTOMERS IN THE AFFECTED AREA STARTED REPORTING HIGH GAS PILOTS AND FIRES TO ISU AND THE FIRE DEPARTMENT. THE HIGH-PRESSURE GAS SOURCE WAS TURNED OFF BUT FIRES CONTINUED TO BE REPORTED, THE FIRES WROUGHT MAJOR DAMAGE TO THE INTERIORS OF 10 HOUSES AND MINOR DAMAGE TO KITCHENS AND APPLIANCES IN 42 OTHERS. PROPERTY DAMAGE WAS ESTIMATED AT $80,000.
Recommendation: THE NTSB RECOMMENDS THAT THE IOWA STATE HIGHWAY COMMISSION TAKE THE FOLLOWING ACTION: REVISE ITS PROCEDURES SO THAT ITS INSPECTORS, WHO WILL BE ASSIGNED TO A CONSTRUCTION JOB, ARE AWARE OF THE VARIOUS ASPECTS OF THE PROJECT AND PROBLEMS OF INTERFERENCE WITH UTILITIES.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Pipeline
Location: Burlington, IA, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA70MP001
Accident Reports:
Low Pressure Natural Gas Distribution System
Report #: PAR-70-01
Accident Date: 11/6/1969
Issue Date: 10/14/1970
Date Closed: 7/20/1976
Addressee(s) and Addressee Status: State of Iowa, Highway Commission (Closed--No Longer Applicable)
Keyword(s):

Safety Recommendation History
From: State of Iowa, Highway Commission
To: NTSB
Date: 12/21/1970
Response: LETTER FROM DIRECTOR OF IOWA STATE HIGHWAY COMMISSION: WE CERTAINLY CAN MAKE SOME EFFORT IN THIS AREA. WE WILL MAKE EVERY ATTEMPT TO HAVE THE INSPECTION FORCES WELL INFORMED AT ALL TIMES ON ALL THE FACTORS OF THE PROPOSED CONSTRUCTION.