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Safety Recommendation Details

Safety Recommendation P-93-002
Details
Synopsis: ON JANUARY 17, 1992, WHILE A CREW FROM PEOPLES GAS LIGHT AND COKE COMPANY (PEOPLES) WAS DOING ROUTINE ANNUAL MAINTENANCE WORK ON A MONITOR REGULATOR AT ONE OF ITS REGULATOR STATIONS, HIGH-PRESSURE GAS ENTERED A LOW-PRESSURE SYSTEM. THE GAS--UNDER AS MUCH AS 10 PSIG OF PRESSURE--ESCAPED THROUGH GAS APPLIANCES INTO HOMES AND OTHER BUILDINGS, WHERE IT WAS IGNITED BY SEVERAL UNIDENTIFIED SOURCES. THE RESULTING EXPLOSION AND FIRES KILLED 4 PEOPLE, INJURED 4, AND DAMAGED 14 HOUSES AND 3 COMMERCIAL BUILDINGS.
Recommendation: THE NTSB RECOMMENDS THAT THE PEOPLE GAS LIGHT AND COKE COMPANY: DEVELOP PROCEDURES TO ENSURE THAT THE MAXIMUM SAFE SYSTEM PRESSURE IS NOT EXCEEDED WHEN THE PRESSURE IN A GAS SYSTEM IS BEING MANUALLY CONTROLLED.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Pipeline
Location: Chicago, IL, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA92MP004
Accident Reports: ‚ÄčOver-Pressure of Peoples Gas Light and Coke Company Low-Pressure Distribution System
Report #: PAR-93-01-SUM
Accident Date: 1/17/1992
Issue Date: 1/26/1993
Date Closed: 4/16/1993
Addressee(s) and Addressee Status: Peoples Gas (Closed - Acceptable Action)
Keyword(s):

Safety Recommendation History
From: NTSB
To: Peoples Gas
Date: 4/16/1993
Response: THE BOARD NOTES THAT PEOPLES' PROCEDURES TO ENSURE THAT THE MAXIMUM SAFE SYSTEM PRESSURE IS NOT EXCEEDED HAVE BEEN MODIFIED SO THAT A SINGLE BYPASS LINE IS NOT USED, PRESSURE IS NOT MANUALLY CONTROLLED, & MAINTENANCE IS SCHEDULED WHEN THE SYSTEM CAN BE SHUT DOWN. PEOPLES IS INCLUDING THESE NEW PROCEDURES IN REVISIONS TO ITS GAS OPERATIONS TRAINING MANUAL. BASED ON THIS INFO, P-93-2 HAS BEEN CLASSIFIED "CLOSED--ACCEPTABLE ACTION."

From: Peoples Gas
To: NTSB
Date: 2/25/1993
Response: WE HAVE MODIFIED OUR PROCEDURES FOR THE ANNUAL INSPECTION OF REGULATORS SO THAT THE TYPE OF INCIDENT WHICH OCCURRED ON JANUARY 17, 1992, CANNOT HAPPEN AGAIN. UNDER THE REVISED PROCEDURES FOR ANNUAL INSPECTIONS, THE COMPANY IS NOT USING A SINGLE BYPASS LINE AND IS NOT MANUALLY CONTROLLING THE PRESSURE. WE WILL REFLECT THE CHANGES TO OUR PROCEDURES DESCRIBED ABOVE IN REVISIONS TO OUR GAS OPERATIONS TRAINING MANUAL.