{"operation":"document","citation":"P-79-024","title":"NTSB Safety Recommendation P-79-024","source_type":"guidance","agency":"National Transportation Safety Board","status":"guidance","official":true,"published_on":"1979-08-08","effective_on":"1979-08-08","summary":"THE NTSB RECOMMENDS THAT THE NATURAL GAS PIPELINE COMPANY OF AMERICA: IDENTIFY CONTOUR AREAS WHERE VERTICAL OR HORIZONTAL BENDS IN THE PIPELINE MAY EXIST, AND EXCAVATE, ON A RANDOM BASIS ACCEPTABLE TO THE APPROPRIATE STATE AGENCIES, TO DETERMINE IF COMPRESSION COUPLINGS LOCATED ADJACENT TO THESE BENDS HAVE EXPERIENCED EXCESSIVE AXIAL FORCES THAT COULD CAUSE A COUPLING FAILURE. INSTALL SUITABLE STRAPPING OR SLEEVING O","machine_formats":{"json":"https://regulus.evalyn.ai/document/ntsb-recommendation-p-79-024.json","markdown":"https://regulus.evalyn.ai/document/ntsb-recommendation-p-79-024.md"},"app_url":"https://regulus.evalyn.ai/document/ntsb-recommendation-p-79-024","source_url":"https://data.ntsb.gov/carol-main-public/sr-details/P-79-024","body":"NTSB safety recommendation P-79-024.\n\nTHE NTSB RECOMMENDS THAT THE NATURAL GAS PIPELINE COMPANY OF AMERICA: IDENTIFY CONTOUR AREAS WHERE VERTICAL OR HORIZONTAL BENDS IN THE PIPELINE MAY EXIST, AND EXCAVATE, ON A RANDOM BASIS ACCEPTABLE TO THE APPROPRIATE STATE AGENCIES, TO DETERMINE IF COMPRESSION COUPLINGS LOCATED ADJACENT TO THESE BENDS HAVE EXPERIENCED EXCESSIVE AXIAL FORCES THAT COULD CAUSE A COUPLING FAILURE. INSTALL SUITABLE STRAPPING OR SLEEVING ON COUPLINGS WHICH DO NOT PASS REINSPECTION BECAUSE OF LEAKAGE, CORROSION, OR EVIDENCE OF PARTIAL PULLOUT. (URGENT)\n\nPriority: CLASS I\n\nOverall Status: Closed - Acceptable Action\n\nIssued Date: 1979-08-08\n\nAdopted Date: 1979-07-19\n\nOverall Date Closed: 1979-09-19\n\nSynopsis: ON APRIL 18, 1979, A 24-INCH NATURAL GAS TRANSMISSION PIPELINE OWNED BY THE NATURAL GAS PIPELINE COMPANY OF AMERICA (GAS COMPANY) PULLED OUT OF A COMPRESSION COUPLING DURING A LINE-LOWERING PROJECT UNDER IOWA STATE HIGHWAY 181 IN A RURAL AREA NEAR DALLAS, IOWA. WITHIN SECONDS, THE NATURAL GAS IGINITED AND BURNED A 900-FOOT BY 400-FOOT AREA. FIVE OF THE EIGHT INJURED WORKERS WERE HOSPITALIZED. TWO CARS, A PICKUP TRUCK, AND A TRAILER HOUSING CONSTRUCTION EQUIPMENT WERE DESTROYED. A BACKHOE WAS PARTLY DAMAGED, AND WINDOWS WERE BROKEN IN A NEARBY FARMHOUSE.\n\nNtsbnumber: DCA79FP013\n\nReport Number: None\n\nAddressee Name: Natural Gas Pipeline Company of America\n\nAddressee Status: Closed--No Longer Applicable\n\nAddressee Date Closed: 1979-09-19\n\nAddressee Acronym: NGPL\n\nAddressee Organization Type: P-Private Industry\n\nCommunication Date: 1979-08-23\n\nCommunication Type: Official Correspondence\n\nCommunication Contents: NATURAL GAS PIPELINE COMPANY OF AMERICA LTR: A MASSIVE PROGRAM HAS BEEN INITATED TO LOCATE VERTICAL AND HORIZONTAL BENDS IN THE PIPELINE. EARLY STAGES WILL BE IN IOWA ONLY BECAUSE OF THE ACCIDENT RECORD. IT WILL EXPAND INTO OTHER STATES. AT EACH LOCATED BEND, THE DEPTH OF COVER AND DEGREE OF BEND ARE MEASURED. THE POSSIBILITY OF A NET UNBALANCED FORCE EXISTING UNDER WORST CONDITIONS IS CALCULATED. WHERE PROBLEMS ARE FOUND, ANCHORS AND SLEEVES WILL BE APPLIED. COUPLINGS ADJACENT TO BENDS WILL BE EXPOSED ON A RANDOM BASIS FOR VISUAL INSPECTION. WHERE THERE IS EVIDENCE OF PARTIAL PULLOUT, RADIOGRAPHY WILL BE USED TO DETERMINE THE LOCATION OF THE PIPE IN THE COUPLING. REINFORCING SLEEVES WILL BE USED WHERE CORRECTIVE ACTION IS NEEDED. AS OF AUGUST 17, 1979, 57 LOCATIONS WERE IDENTIFIED IN IOWA AS SITES WHERE REMEDIAL WORK MAY BE BENEFICIAL, AND WORK HAS BEEN COMPLETED AT 28 OF THESE.\n\nAddressee Acronym: NGPL\n\nAddressee Organization Type: P-Private Industry\n\nCommunication Date: 1979-09-19\n\nCommunication Type: Official Correspondence","truncated":false,"body_characters":2695}