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U. S. Department of Transportation Pipeline and Hazardous Materials Safety Administration. www.dot.gov. Aging (Old?) Infrastructure. Linda Daugherty Deputy Associate Administrator Policy and Programs Office of Pipeline Safety. What defines “old”, anyway?
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U. S. Department of Transportation Pipeline and Hazardous Materials Safety Administration www.dot.gov
Aging (Old?) Infrastructure Linda Daugherty Deputy Associate Administrator Policy and Programs Office of Pipeline Safety
What defines “old”, anyway? • If a pipeline is old, is it more risky? • Are all types of old pipeline a concern? • Are the regulations protective enough? • What about replacement/ rehabilitation?
What is Old – Liquid? • 55% installed prior to the regulations in 1970 • If installed in ‘70, it is over 40 yrs old. • Mostly steel pipe • Post-war industry/ population surge
What is Old – Gas Transmission? • 59% installed prior to the regulations in 1970 • If installed in ‘50, it is over 60 yrs old. • Mostly steel pipe
What is Old – Gas Distribution? • 31% installed prior to the regulations in 1970. • Older – cast iron, bare steel, copper • Newer – plastic • Population growth/ city expansions
Is Older Pipe More Risky? • Aging infrastructure issues: • material and techniques prevalent at the time (i.e. vintage) • amount of time in service (i.e., service age). • Pipe installed in the 1950’s and 1960’s now have similar incident rates per mile as pipe installed more recently • Pipe installed in or before the 1940’s have a higher incident rate than pipe installed more recently. • Not known if higher incident rate is due to vintage issue or service age (over 70 years old)
What About the Type of Pipe? • Steel Pipe (Liquid and Gas Transmission) • Vintage Issues – Steel quality, seam types, welding controls • Service Age Issues: Cycling, maintenance (corrosion prevention), component functionality • Cast Iron (Distribution) • Vintage Issues – Construction practices, small diameter (beam strength) • Service Age Issue: External stresses, graphitization
What About the Type of Pipe? • Plastic Pipe (Distribution and some Gas Transmission) • Vintage Issues – Material quality control, installation practices (fusion, rock impingement) • Service Age Issues: Material degradation due to composition or environmental conditions.
Repair/Rehabilitation/Requalification/Replacement? • DOT Secretary Call to Action • Encouraging ALL stakeholders to get involved. • Different states = different risks and different priorities • Need to focus on highest risk pipe in each state • Older pipe can be difficult to assess/repair • Very expensive to consumers • Potentially very disruptive to the public
Are the Regulations Protective Enough ? • 192.703 General. (Natural Gas Pipelines) • (b) Each segment of pipeline that becomes unsafe must be replaced, repaired, or removed from service. • (c) Hazardous leaks must be repaired promptly. • 195.401 General requirements. (Liquid Pipelines) • (a) No operator may operate or maintain its pipeline systems at a level of safety lower than that required by this subpart and the procedures it is required to establish under §195.402(a) of this subpart.
Are the Regulations Protective Enough ? • PHMSA is seeking YOUR input • Pipeline Safety: Safety of Gas Transmission Pipelines - Advanced Notice of Proposed Rulemaking (ANPRM) • Comment Period Extended to January 20, 2012 • Pipeline Safety: Safety of On-Shore Hazardous Liquid Pipelines • Working on Notice of Proposed Rulemaking
U. S. Department of Transportation Pipeline and Hazardous Materials Safety Administration www.dot.gov