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1 Philip Sher Connecticut Department of Public Utility Control Gas Pipeline Safety Unit RepresentingNAPSR National Association of Pipeline Safety Representatives November 4, 2003 Direct Assessment
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2 NAPSR NAPSR = National Association of Pipeline Safety Representatives non-profit organization state pipeline safety directors, managers, inspectors and technical personnel to support, encourage, develop and enhance pipeline safety regulation Founded on December 2, 1982
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3 Integrity Management Program Pipeline IMP = “a plan or system” “to handle or direct with a degree of skill” the “soundness” of a pipeline system
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4 We Need Integrity Management Bellingham, WA Carlsbad, NM Edison, NJ
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5 We Will Have Integrity Management
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6 Steps in Risk Management
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10 ANSI Gas Piping Technology Committee & ANSI B31.8S Integrity Management Process.
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11 High Consequence Area – The Real World
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12 Integrity Assessment Methods 1. Smart pig 2. Pressure test 3. Direct assessment 4. Other (new technology )
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13 Smart Pigs 1 st smart pigs – mid 1960’s, primarily for the detection of wall thinning. Now other types of defects - cracks, coating disbondment, dents and gouges - are detectable Smart pig digs have served to calibrate and validate smart pig results
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14 Smart Pigs Smart pigs need launchers & receivers long radius bends full opening valves constant pipe diameter Smart pigs may require interruption 25-30% of transmission pipelines are piggable
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15 Pressure Testing Require taking pipeline out of service Water removal can be difficult Water can promote internal corrosion Pressure testing can grow subcritical flaws into critical flaws Pressure test provides limited information and limited evaluation of future performance
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16 Direct Assessment ECDA =External Corrosion Direct Assessment ICDA =Internal Corrosion Direct Assessment SCCDA=Stress Corrosion Cracking Direct Assessment
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17 ECDA 4 Step Process Step 1 - Pre Assessment Step 2 - Indirect Examination Step 3 - Direct Examination Step 4 - Post Assessment
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18 Direct Assessment Absolute need for DA MUST be perfected Must define parameters where it works Must define parameters to evaluate it in use Must develop body of knowledge and talent to utilize DA
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19 Tools of ECDA Cathodic Protection Readings (CP)
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20 Tools of ECDA Close Interval Survey (CIS)
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21 Tools of ECDA Direct Current Voltage Gradient (DCVG)
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22 Tools of ECDA C-Scan (The C-Scan mode or pulse-echo provides a planar view image at a specific depth. Illustrations of delaminations and void formation can be generated.)
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23 Tools of ECDA Current Mapper
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24 Direct Assessment Some DA tools are old and there is considerable experience Some DA tools are new with little experience The DA process is new incorporating old and new tools, old and new techniques, and significant new data integration and documentation
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25 Direct Assessment Just as smart pig needed calibration and verification, DA will also need to be proven for the many conditions that may exist. that may exist. DA must be repeatable DA must have a high level of confidence Operator must demonstrate compliance Regulator must confirm compliance
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26 Reassessment Period Original proposed reassessment period Final reassessment period?
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28 Ultimate Goal
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