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Safety Recommendation Details

Safety Recommendation P-80-012
Details
Synopsis: ON AUGUST 28, 1978, NATURAL GAS, WHICH HAD ESCAPED FROM A CIRCUMFERENTIAL FRACTURE IN A SOCKET HEAT-FUSION COUPLING ON A 2-IN. POLYETHYLENE (PE) MAIN, OPERATING AT 40-PSIG PRESSURE, MIGRATED BENEATH A ONE-STORY HOUSE IN GRAND ISLAND, NEBRASKA, EXPLODED, AND THEN BURNED. ONE PERSON WAS INJURED; THE HOUSE AT 2517 APACHE ROAD WAS DESTROYED; AND THREE ADJACENT HOUSES WERE DAMAGED. THE GAS WAS IGNITED BY AN UNKNOWN SOURCE.
Recommendation: THE NTSB RECOMMENDS THAT THE NORTHWESTERN PUBLIC SERVICE COMPANY: EMPHASIZE THE ENFORCEMENT OF COMPANY CONSTRUCTION PROCEDURES BY PROJECT ENGINEERS AND INSPECTORS THROUGH TRAINING PROGRAMS AND SUPERVISORY FOLLOWUP.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Pipeline
Location: Grand Island, NB, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: FTW78FP014
Accident Reports:
Report #: None
Accident Date: 8/25/1978
Issue Date: 3/5/1980
Date Closed: 2/2/1983
Addressee(s) and Addressee Status: Northwestern Public Service Company (Closed--No Longer Applicable)
Keyword(s): Training and Education

Safety Recommendation History
From: NTSB
To: Northwestern Public Service Company
Date: 2/2/1983
Response:

From: Northwestern Public Service Company
To: NTSB
Date: 11/4/1982
Response: NORTHWESTERN PUBLIC SERVICE COMPANY LTR: (1) PROPER GAS LINE CONSTRUCTION PROCEDURES, MORE SPECIFICALLY BACKFILL AND SUPPORT TECHNIQUES, WERE REVIEWED WITH COMPANY PERSONNEL THROUGH TRAINING PROGRAMS WITH FOLLOW-UP REFRESHER TRAINING AND SUPERVISORY REVIEW; (2) COMPANY PERSONNEL WERE ADVISED TO MONITOR NON-COMPANY CONSTRUCTION PROJECTS (SEWER AND PLUMBING, FOR EXAMPLE) WHICH WOULD AFFECT THE COMPANY'S GAS MAINS AND SERVICES AND TO DISCUSS WITH CONTRACTORS THE NEED FOR PROPER SUPPORT OF GAS MAINS AND SERVICES; (3) THE COMPANY INITIATED A PROGRAM TO CONDUCT MONTHLY FLAME IONIZATION LEAKAGE SURVEYS OVER ALL IDENTIFIABLE PLASTIC GAS MAINS MANUFACTURED BY THE FIRM WHICH HAD PRODUCED THE CRACKED COUPLING; (4) THE COMPANY INITIATED A PROGRAM, WHICH HAS NOW BEEN COMPLETED, TO REPLACE ALL PLASTIC TEES, ELBOWS AND END CAPS MANUFACTURED BY THE FIRM WHICH HAD PRODUCED THE CRACKED COUPLING.

From: NTSB
To: Northwestern Public Service Company
Date: 10/8/1982
Response: