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Safety Recommendation Details

Safety Recommendation P-78-001
Details
Synopsis: ON JULY 20, 1977, A 12-INCH PROPANE PIPELINE, OWNED BY THE CONSOLIDATED GAS SUPPLY CORPORATION, RUPTURED NEAR THE TOWN OF RUFF CREEK, PENNSYLVANIA. THE LIQUID ESCAPED FROM THE PIPELINE, VAPORIZED, AND PROPANE VAPORS SETTLED LIKE A FOG OVER THE BOTTOM OF A VALLEY. TWO MEN IN A PICKUP TRUCK ENTERED THE PROPANE CLOUD; THE TRUCK STALLED AND THE PROPANE GAS IGNITED WHEN AN ATTEMPT WAS MADE TO RESTART THE TRUCK. THE 2 PERSONS IN THE TRUCK WERE KILLED.
Recommendation: INSPECT THE FIELD SAGBEND UNDER THE STREAM AND ADJACENT TO THE OVERBEND THAT FAILED AND AT ANY OTHER KNOWN LOCATIONS WHERE THE PIPELINE HAS UNDERGONE SETTLEMENT OF THIS TYPE WITH THE MAGNETIC-PARTICLE-INSPECTION OR OTHER SUITABLE TECHNIQUE, FOR SIGNS OF STRESS-CORROSION CRACKING. REPLACE THE SAGBEND OR OTHER PIPE IF INCIPIENT CRACKING IS PRESENT.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Pipeline
Location: Ruff Creek, PA, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA77MP027
Accident Reports:
Consolidated Gas Supply Corporation, Propane Pipeline Rupture and Fire
Report #: PAR-78-01
Accident Date: 7/20/1977
Issue Date: 2/8/1978
Date Closed: 3/14/1979
Addressee(s) and Addressee Status: Consolidated Gas Transmission Corporation (Closed--No Longer Applicable)
Keyword(s):

Safety Recommendation History
From: NTSB
To: Consolidated Gas Transmission Corporation
Date: 3/14/1979
Response:

From: Consolidated Gas Transmission Corporation
To: NTSB
Date: 7/17/1978
Response: CONSOLIDATED GAS SUPPLY CORP. LTR: THE EXTERIOR SURFACE OF THE SAGBEND WAS INSPECTED ON 4-3-78 UTILIZING X-RAY MAGNETIC PARTICLE, DYE PENETRATION, AND VISUAL INSPECTION. THE INSPECTION WAS PERFORMED TO DETERMINE THE PRESENCE OF ANY PRIMARY OR SECONDARY TRANSVERSE CRACKS. THE TESTS SHOWED THAT NO STRESS-CORROSION CRACKING WAS PRESENT. THE VISUAL INSPECTION SHOWED THE PIPE TO BE IN VERY GOOD CONDITION. 1/23/79 CONSOLIDATED GAS SUPPLY CORP. LTR: THE SAGBEND WAS INSPECTED AND NO STRESS CORROSION CRACKING WAS FOUND. THE ENTIRE LENGTH OF LINE G-136 IS BEING WALKED AT LEAST ONCE A MONTH AND MORE FREQUENTLY IN CERTAIN AREAS SUCH AS BETWEEN I-79 AND I-70. NO GROUND SETTLEMENT HAS BEEN WITNESSED IN THE AREA OF THE PIPELINE. ELEVATION BENCH MARKS HAVE BEEN ESTABLISHED IN THE AREA OF THE FAILURE TO CHECK FOR ANY MOVEMENT OF THE PIPE OR SURROUNDING GROUND. THESE BENCH MARKS ARE BEING MONITORED ON A WEEKLY BASIS. THIS MONITORING WILL CONTINUE AND SHOULD ANY SETTLEMENT BE DISCOVERED, THE PIPE IN THAT AREA WILL BE THOROUGHLY INVESTIGATED FOR STRESS CORROSION CRACKING.