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Perspectives and Recommendations for the Natural Gas Industry 1 John B. Vorderbrueggen, PE Chief, Pipeline and Hazardous Materials Investigations WRGC.

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Presentation on theme: "Perspectives and Recommendations for the Natural Gas Industry 1 John B. Vorderbrueggen, PE Chief, Pipeline and Hazardous Materials Investigations WRGC."— Presentation transcript:

1 Perspectives and Recommendations for the Natural Gas Industry 1 John B. Vorderbrueggen, PE Chief, Pipeline and Hazardous Materials Investigations WRGC August 19, 2014

2 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

3 A Short Quiz The NTSB 2014 budget is A.$55 Million B.$87.5 Million C.$103 Million D.$137 Million 3

4 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

5 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

6 6 Natural Gas Pipeline Accidents Cleburne, Texas Sissonville, West Virginia Birmingham, Alabama Manhattan, New York

7 Enterprise Products Operating, Ltd Natural Gas Transmission Pipeline Rupture and Fire Cleburne, Texas June 7,

8 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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10 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

11 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

12 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

13 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

14 Improper pipeline locate work DIRECTLY ABOVE THE UNMARKED ENTERPRISE PIPELINE 14

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17 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

18 Closeout Actions Enterprise Products Ltd. improved the locate ticket procedure and technician training Final Accident Brief issued September 9, 2013 − −No recommendations issued 18

19 Columbia Gas Transmission Pipeline Rupture Sissonville, West Virginia December 11, :41 pm 19

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21 Accident Summary 20-inch diameter carbon steel, inch wall thickness 1,000 psig MAOP 929 psig Operating pressure Installed 1967 “Not piggable” 21

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24 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

25 The NTSB Probable Cause External corrosion of the pipe wall − −deteriorated coating − −ineffective cathodic protection Corrosion not detected − −Not inspected or tested since

26 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

27 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

28 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

29 NTSB Recommendations PHMSA − −Add principal arterial roadways such as interstate highways to “identified sites” for HCA determination 29

30 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

31 Ongoing Investigations Birmingham, Alabama Manhattan, New York 31

32 Birmingham, Alabama Alagasco December 17, :30 am Cast iron distribution line (1951) 25 psig MAOP 19 psig operating 1 Fatality 4 injuries 32

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35 Manhattan, New York (Harlem) Consolidated Edison March 12, :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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39 Test Your Alertness - Just Before Lunch! My closing comment on the NTSB annual budget quiz was: It is Not Enough! 39

40 40 John B. Vorderbrueggen, PE Chief, Pipeline and Hazardous Materials Investigations


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