1 philip sher connecticut department of public utility control gas pipeline safety unit...
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Philip SherPhilip Sher Connecticut Department of Public Utility Control Connecticut Department of Public Utility Control
Gas Pipeline Safety UnitGas Pipeline Safety Unit
RepresentingRepresenting
NAPSRNAPSRNational Association of Pipeline Safety RepresentativesNational Association of Pipeline Safety Representatives
November 4, 2003November 4, 2003
Direct AssessmentDirect Assessment
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NAPSRNAPSR
NAPSR = National Association of Pipeline NAPSR = National Association of Pipeline Safety RepresentativesSafety Representatives
non-profit organizationnon-profit organization state pipeline safety directors, managers, state pipeline safety directors, managers,
inspectors and technical personnelinspectors and technical personnel to support, encourage, develop and enhance to support, encourage, develop and enhance
pipeline safety regulationpipeline safety regulation
Founded on December 2, 1982Founded on December 2, 1982
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Integrity Management ProgramIntegrity Management Program
Pipeline IMPPipeline IMP
==
““a plan or system” “to handle or direct a plan or system” “to handle or direct with a degree of skill” the “soundness” with a degree of skill” the “soundness” of a pipeline systemof a pipeline system
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ANSI Gas Piping Technology Committee & ANSI Gas Piping Technology Committee & ANSI B31.8SANSI B31.8S
Integrity Management Process.Integrity Management Process.
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Integrity Assessment MethodsIntegrity Assessment Methods
1.1. Smart pigSmart pig
2.2. Pressure testPressure test
3.3. Direct Direct assessmentassessment
4.4. Other (new Other (new technologytechnology))
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Smart PigsSmart Pigs
11stst smart pigs – mid 1960’s, primarily smart pigs – mid 1960’s, primarily for the detection of wall thinning. Now for the detection of wall thinning. Now other types of defects - cracks, other types of defects - cracks, coating disbondment, dents and coating disbondment, dents and gouges - are detectablegouges - are detectable
Smart pig digs have served to Smart pig digs have served to calibrate and validate smart pig calibrate and validate smart pig resultsresults
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Smart PigsSmart Pigs Smart pigs needSmart pigs need
launchers & receiverslaunchers & receivers long radius bendslong radius bends full opening valvesfull opening valves constant pipe diameterconstant pipe diameter
Smart pigs may require Smart pigs may require interruptioninterruption
25-30% of transmission 25-30% of transmission pipelines are piggablepipelines are piggable
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Pressure TestingPressure Testing
Require taking pipeline out of serviceRequire taking pipeline out of service Water removal can be difficultWater removal can be difficult Water can promote internal corrosionWater can promote internal corrosion Pressure testing can grow subcritical Pressure testing can grow subcritical
flaws into critical flawsflaws into critical flaws Pressure test provides limited Pressure test provides limited
information and limited evaluation of information and limited evaluation of future performancefuture performance
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Direct AssessmentDirect Assessment ECDA =ECDA = External Corrosion Direct External Corrosion Direct
AssessmentAssessment ICDA =ICDA = Internal CorrosionInternal Corrosion
Direct Direct AssessmentAssessment SCCDA=SCCDA= Stress Corrosion Cracking Stress Corrosion Cracking
Direct AssessmentDirect Assessment
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ECDA 4 Step ProcessECDA 4 Step Process
Step 1 - Pre AssessmentStep 1 - Pre Assessment Step 2 - Indirect ExaminationStep 2 - Indirect Examination Step 3 - Direct ExaminationStep 3 - Direct Examination Step 4 - Post AssessmentStep 4 - Post Assessment
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Direct AssessmentDirect Assessment
Absolute need for DAAbsolute need for DA MUST be perfectedMUST be perfected Must define parameters where it Must define parameters where it
worksworks Must define parameters to evaluate it Must define parameters to evaluate it
in usein use Must develop body of knowledge and Must develop body of knowledge and
talent to utilize DAtalent to utilize DA
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Tools of ECDATools of ECDA
Direct Current Voltage Gradient (DCVG)Direct Current Voltage Gradient (DCVG)
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Tools of ECDATools of ECDA
C-Scan (The C-Scan mode or pulse-echo C-Scan (The C-Scan mode or pulse-echo provides a planar view image at a specific provides a planar view image at a specific depth. Illustrations of delaminations and depth. Illustrations of delaminations and void formation can be generated.)void formation can be generated.)
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Direct AssessmentDirect Assessment
Some DA tools are old and there is Some DA tools are old and there is considerable experienceconsiderable experience
Some DA tools are new with little Some DA tools are new with little experienceexperience
The DA process is new incorporating old The DA process is new incorporating old and new tools, old and new techniques, and new tools, old and new techniques, and significant new data integration and and significant new data integration and documentationdocumentation
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Direct AssessmentDirect Assessment
Just as smart pig needed calibration and Just as smart pig needed calibration and verification, DA will also need to be verification, DA will also need to be proven for the many conditionsproven for the many conditions
that may exist.that may exist. DA must be repeatableDA must be repeatable DA must have a high level of confidenceDA must have a high level of confidence Operator must demonstrate complianceOperator must demonstrate compliance Regulator must confirm complianceRegulator must confirm compliance
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Reassessment PeriodReassessment Period
Original proposed reassessment Original proposed reassessment periodperiod
Final reassessment period?Final reassessment period?