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Safety Recommendation Details

Safety Recommendation P-70-038
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 IOWA SOUTHERN UTILITIES, INC., TAKE THE FOLLOWING ACTION: ESTABLISH A WRITTEN PROCEDURE FOR PREVENTING DAMAGE TO UNDERGROUND FACILITIES. THE PROGRAM SHOULD CONTAIN THE SAME METHODS RECOMMENDED TO THE OFFICE OF PIPELINE SAFETY.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Alternate 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Addressee(s) and Addressee Status: Iowa Southern Utilities, Inc. (Closed--No Longer Applicable)
Keyword(s):

Safety Recommendation History
From: Iowa Southern Utilities, Inc.
To: NTSB
Date: 7/7/1971
Response: THE BOARD WAS INFORMED BY LETTER THAT THE FOLLOWING ACTION HAS BEEN TAKEN: THE DISTRICT SUPERVISOR SHALL CONTACT TELEPHONE COMPANY MANAGERS, CONTRACTORS, AND LOCAL AUTHORITIES IN THE GAS TOWNS WITHIN HIS DISTRICT TO INITIATE PERIODIC MEETINGS BETWEEN ALL UTILITIES, CONTRACTORS, AND OTHER AGENCIES WHICH WILL BENEFIT FROM AN INTERCHANGE OF CURRENT AND PROPOSED CONSTRUCTION PROGRAMS IN THE TERRITORY WHERE OUR FACILITIES MAY BE IN CLOSE PROXIMITY TO OTHERS. MEETINGS SHOULD BE SCHEDULED JUST PRIOR TO AND DURING CONSTRUCTION SEASON. WHEN OUR FACILITIES ARE WITHIN OR ADJACENT TO A CONSTRUCTION AREA, THE GAS SUPERVISOR IS EXPECTED TO EXERCISE GOOD JUDGMENT AND COMMON SENSE IN PROVIDING, WHEN WARRANTED, ADDITIONAL PROTECTION BY POSTING WARNING SIGNS, STAKING, FENCING, PROVIDING A REPRESENTATIVE, ETC., FOR THE FACILITY AFFECTED. CORRESPONDENCE DOCUMENTATION INCOMPLETE.

From: NTSB
To: Iowa Southern Utilities, Inc.
Date: 6/2/1971
Response: