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Perspectives and Recommendations for the Natural Gas Industry 1 John B. Vorderbrueggen, PE Chief, Pipeline and Hazardous Materials Investigations WRGC August 19, 2014
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A Short Quiz The NTSB “10 Most Wanted List” is A.Candidates for the next NTSB Chairman B.Best restaurants in DC C.Board Advocacy Priorities 2
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A Short Quiz The NTSB 2014 budget is A.$55 Million B.$87.5 Million C.$103 Million D.$137 Million 3
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A Short Quiz The PHMSA 2014 budget is A.$45 Million B.$118.6 Million C.$210 Million D.$260.5 Million 4 Hazmat Division Pipeline Division 2014 budget Administration’s 2015 proposal
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The NTSB Board Members August 2014 Hon. Christopher A. Hart Acting Chairman Hon. Robert L. Sumwalt Hon. Mark R. Rosekind Hon. Earl F. Weener 5
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6 Natural Gas Pipeline Accidents Cleburne, Texas Sissonville, West Virginia Birmingham, Alabama Manhattan, New York
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Enterprise Products Operating, Ltd Natural Gas Transmission Pipeline Rupture and Fire Cleburne, Texas June 7, 2010 7
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Accident Summary 36-inch diameter carbon steel 1050 psig MAOP 950 psig Operating pressure 3 rd Party damage 1 Fatality 6 Injuries 8
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Improper pipeline locate work Two parallel pipelines – 30 feet apart November 2009 locate tickets for electric utility design phase − −Energy Transfer pipeline marked − −Enterprise pipeline not marked Only one pipeline on survey map 10
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Improper pipeline locate work June 2010 locate tickets for construction − −Energy Transfer pipeline marked − −Enterprise pipeline not marked on three attempts to find the construction site Ticket closed – “all clear” 11
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Improper pipeline locate work Second ticket issued three days later − −Locator and contractor presumed it was a duplicate of first Ticket closed – “all clear” Locator never surveyed the right-of-way on four visits 12
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Improper pipeline locate work Accident date Marked Energy Transfer pipeline Mowed right-of-way Contractor moved dig marker to increase distance from the marked pipeline… 13
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Improper pipeline locate work DIRECTLY ABOVE THE UNMARKED ENTERPRISE PIPELINE 14
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The NTSB Probable Cause Contractor power auger punctured the unmarked buried pipeline Contributing factors − −No permanent pipeline markers − −Pipeline locator did not mark pipeline before excavation work 17
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Closeout Actions Enterprise Products Ltd. improved the locate ticket procedure and technician training Final Accident Brief issued September 9, 2013 − −No recommendations issued 18
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Columbia Gas Transmission Pipeline Rupture Sissonville, West Virginia December 11, 2012 12:41 pm 19
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Accident Summary 20-inch diameter carbon steel, 0.281 inch wall thickness 1,000 psig MAOP 929 psig Operating pressure Installed 1967 “Not piggable” 21
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Pipeline Integrity Management Three parallel, interconnected lines − −30-inch diameter in HCA − −26-inch diameter in HCA − −20-inch diameter (not in HCA) Interstate highway does not count 24
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The NTSB Probable Cause External corrosion of the pipe wall − −deteriorated coating − −ineffective cathodic protection Corrosion not detected − −Not inspected or tested since 1988 25
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Contributing Cause Rocky backfill degraded corrosion protection Shutdown delay − −SCADA alarms and alerts configuration delayed controller response − −No automatic shutoff or remote control valves 26
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Key Findings Automatic SCADA trend data alerts would improve recognition of system problems Line would have required integrity management had highway proximity to pipeline been included in HCA decisions 27
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NTSB Recommendations Columbia Gas Transmission − −Implement a process for determining alarm and alert setpoints and response actions − −Provide system trend data and assign alarm function to critical trend variations 28
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NTSB Recommendations PHMSA − −Add principal arterial roadways such as interstate highways to “identified sites” for HCA determination 29
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Columbia Gas Corrective Actions Conducted inline inspections on the non-HCA 20-inch pipeline Performed close interval survey Reassessed the pipeline coating using AC and DC voltage gradient testing SCADA instrument upgrades on looped systems 30
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Ongoing Investigations Birmingham, Alabama Manhattan, New York 31
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Birmingham, Alabama Alagasco December 17, 2013 2:30 am Cast iron distribution line (1951) 25 psig MAOP 19 psig operating 1 Fatality 4 injuries 32
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Manhattan, New York (Harlem) Consolidated Edison March 12, 2014 9:30 am 8-inch cast iron/plastic distribution line (1890 / 2011) 8 in wc MAOP, 6 in wc operating 8 Fatalities 48 injuries 35
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Test Your Alertness - Just Before Lunch! My closing comment on the NTSB annual budget quiz was: It is Not Enough! 39
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40 John B. Vorderbrueggen, PE Chief, Pipeline and Hazardous Materials Investigations 202-314-6467John.vorderbrueggen@ntsb.gov
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