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High Consequence Areas & Pipeline Assessment Intervals –Is there a need for change?. Terry Boss Sr. VP Environment Safety and Operations Interstate Natural Gas Association of America. Outline. Natural Gas and Transportation Management of Public Risk Results of the IMP Program
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High Consequence Areas & Pipeline Assessment Intervals –Is there a need for change? Terry Boss Sr. VP Environment Safety and Operations Interstate Natural Gas Association of America
Outline • Natural Gas and Transportation • Management of Public Risk • Results of the IMP Program • Requesting Flexibility in IMP Program Schedule • Ongoing Initiatives to Improve Performance
Natural Gas and Transportation • Primarily Methane – Hydrogen with some Carbon • Swamp Gas • Lower Density of Energy – Gaseous • Locations of Supply is Diverse • Locations of Market is Diverse • Transportation by Pipelines is Most Feasible • “Bridge” Fuel • Primary Risk is Fire • Lighter than Air • Limited Ignition Range • Heat Radiation based on Quantity
The Natural Gas Industry Marketers Storage Commercial Residential Industrial & Utilities • Producers • Majors • Independents Gathering Storage 30 Major Interstate Pipelines 272,500 Gas Wells 1200 Distributors
More Interstate Natural Gas Pipeline Informationwww.ingaa.org
Managing Public RiskNatural Gas Transmission Pipeline Safety Development
Pipeline Safety - Layers of Protection Example Regulations OPS 49 CFR 192/5 Codes ASME B31.4/8 Standards NACE RP-0169 & RP-0502 API RP-1163 Practices Close Internal Survey Direct Current Voltage Gradient Hydrotesting Inline Inspection Programs Integrity Management Mfg Const Internal SCC Research & Development External Corrosion Threat
Natural Gas Transmission Pipeline Risk Management biased by Population Density • Design • Design Classes • Materials • Strength of Pipe • Construction • Construction Techniques • Operation • Operating pressures and Practices • Inspection • Frequency and Type of Inspection • Maintenance
660 ft. 660 ft. Constant Consequence Concept Pipeline diameter “d” (inches) = 36” MAOP 1650 psig: PIR = 1000 ft Pipeline diameter “d” (inches) = 18” MAOP 600 psig: PIR = 304 ft Pipeline diameter “d” (inches) = 30” MAOP 1000 psig: PIR = 655 ft r = 1009 ft. 20 houses within circle PIR = 0.69 pd2
Pictorial of a High Consequence Area for Natural Gas Overlaid on the Class Location System Houses Class 3 660 ft HCA 30” Pipeline 1010 psig 14
Results of the IMP Program (PHMSA) Carlsbad Number of Significant Incidents Number of Fatalities Number of Injuries Hurricanes Property Damage
Types Failures Static Anomalies Detrimental Non - Detrimental Time Independent Defects Excavation Damage Weather Terrorist Time Dependent Defects Corrosion Cracking
Manage Time Dependent Defects Manage Time Dependent Effects Inline Inspection Pressure Test Direct Assessment Other Approved Methods
Condition of gas transmission pipelines are better than original public perception
GAO concludes that 7 year reassessment period is conservative
Public Workshop to gather comments on Special Permit and Criteria Discussion for 7-year Reassessments Location: Arlington, Virginia Jan 18, 2008
Ongoing Initiatives to Improve Performance • Tools • Processes • Procedures • Implementation
Conclusions • Natural Gas is a Very Important Energy Source • Flexible and Readily Available • Bridge Fuel for Climate Change • Energy Security • Public Risk Can and Is Being Managed • Flexibility in the IMP Program is Very Desirable • Commitment to Ongoing Improvement
Background Material • COMPARISON OF INTEGRITY MANAGEMENT ASSESSMENT TECHNIQUES FOR NATURAL GAS TRANSMISSION PIPELINES • www.ingaa.org • F-2007-09 • NATURAL GAS PIPELINE SAFETY Risk-Based Standards Should Allow Operators to Better Tailor Reassessments to Pipeline Threats • www.gao.gov • GAO-06-945 • Integrity Management Plan Metrics http://primis.phmsa.dot.gov/gasimp/PerformanceMeasures.htm • PHMSA Workshops • Public Workshop to gather comments on Special Permit and Criteria Discussion for 7-year Reassessments http://www.phmsa.dot.gov/portal/site/PHMSA/menuitem.ebdc7a8a7e39f2e55cf2031050248a0c/?vgnextoid=4aeb8defc8de6110VgnVCM1000001ecb7898RCRD&vgnextchannel=5296519d7e818110VgnVCM1000009ed07898RCRD&vgnextfmt=print • Cased Pipeline Integrity Assessment Workshop https://primis.phmsa.dot.gov/meetings/MtgHome.mtg?mtg=54 • Anomaly Assessment and Repair Workshop https://primis.phmsa.dot.gov/meetings/MtgHome.mtg?mtg=55 • Congressional Hearing • The Pipeline Inspection, Protection, Enforcement, and Safety Act of 2006: Implementation Review and Discussion of Safety Reassessment Intervals for Natural Gas Pipelines; Subcommittee on Energy and Air Quality Wednesday, March 12, 2008 http://energycommerce.house.gov/cmte_mtgs/110-eaq-hrg.031208.PIPE.shtml