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Safety Recommendation Details

Safety Recommendation P-70-039
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: IMPROVE ITS ABILITY TO RECEIVE AND PROCESS TELEPHONE CALLS DURING EMERGENCIES.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Unacceptable 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Addressee(s) and Addressee Status: Iowa Southern Utilities, Inc. (Closed--No Longer Applicable)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 RECOMMENDATION TO IMPROVE THE ABILITY TO RECEIVE AND PROCESS TELEPHONE CALLS DURING EMERGENCIES IS BEING STUDIED. THIS BECOMES A PROBLEM OF NUMBERS, THE NUMBER OF DIRECT TELEPHONE LINES PURCHASED, AND THE NUMBER OF QUALIFIED PEOPLE TO HANDLE EMERGENCY CALLS. DURING THE TIME OF EMERGENCY, THIS BECOMES LARGE NUMBERS AND COULD APPROACH THE NUMBER OF CUSTOMERS AFFECTED BY THE INCIDENT. TO DATE, THE STUDIES HAVE NOT PRODUCED A SATISFACTORY AND FEASIBLE METHOD OF SUBSTANTIALLY INCREASING TELEPHONE SERVICE DURING EMERGENCIES. CORRESPONDENCE DOCUMENTATION INCOMPLETE.

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