overview of nysearch programnace rp 0502-2002 (ecda) must be incorporated by reference. remediation...
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Direct Assessment
Alan Eastman, PG&EDebbie DiMeo, Northeast Gas Association
OPS Public Meeting April 25, 2003
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Key Points in Docket Submittal
DA is an effective method for detecting time dependent defects.Baseline and re-assessment schedules for DA must align with schedules for ILI and pressure testing.NACE RP 0502-2002 (ECDA) must be incorporated by reference. Remediation provisions need to be consistent with existing industry standards (B31.8S, RSTRENG)Industry supports Confirmatory DA.Direct Examination of 100% of the pipe (such as for above groundpiping) supports reinspection schedules to be established in the same manner as ILI.RSPA must be involved in DA continuous improvement/best practiceefforts planned in 2003.
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NYS Direct Assessment Process Validation Project
Debbie DiMeo, Director, Plans and OperationsNortheast Gas AssociationOPS PLI Public Meeting April 25, 2003
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NYS DA Process Validation Project Objectives
Demonstrate:
ECDA can be used to assess pipeline integrity with respect to locating areas containing external corrosion, coating flaws and third party damage.
ECDA is a valid pipeline integrity alternative to in-line inspection and pressure testing.
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Key Elements of NYSDA Project
DA process consistent with the NACE ECDA TG041 Standard to validate DA
DA process applied in a uniform and structured manner across NYS
PSC staff as a project partner
Industry expert – objective third party
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Technical BasisNine NGA members performed ECDA on ~2-mile segments (total 20 miles)
Utilized indirect survey tools and selected locations on pipe predicted to have indications and non-indications (ie, controls)
Excavated and assessed ECDA indications and non-indications
Compared predictions to excavation results
Performed statistical analysis
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Results of ~20 Miles of ECDA66 excavations
43 indications 40 locations with coating flaws
11 corrosion damage2 third party damage
3 no damage23 controls
22 no damage1 coating flaw
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Statistical ResultsProbability of finding an anomaly at an indication is 98%
Probability of not finding an anomaly at a control is 88%
Odds ratio of finding an anomaly at indication vs. control is 300 to 1
Indications statistically different from controls
Probability of finding a coating anomaly increases with holiday size ~99% for >5 in2
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Overall observation
Data collected supports DA in finding:
CP inadequaciesCoating flawsExternal corrosionLatent third party damageSubcritical flaws
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ConclusionsData collected supports ECDA as a valid integrity management tool
DA on par with ILI and pressure testing
Technical capability by member companies to perform DA
Members/NYS PSC comfortable with project and DA process
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Next Steps
Continue collecting ECDA data to add to database
Test new DA survey tools
Perform ICDA
Funding approved; work scope being refined
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Overview of PG&E Work
Over the last 5 years have been working to formalize ECDA practicesIncluded a Demonstration Project in California where many Operators and Federal and State Regulators participatedDevelopment of a comprehensive ECDA Procedure (complies with RP0502)Established necessary protocolsApplied to pipelines in all class locationsComparison of 100 miles of ECDA data with same 100 miles of ILI dataContinue participation in industry Best Practice efforts
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200
300
400
500
600
700
800
900
1000
P/S
Pote
ntia
l (-m
V)
OnOffCriteria
Identification & Classification of Indications
CIS CriteriaSevere
CIS < 600 mV off,On/Off converge, >200 mV Depression
ModerateCIS < 600 mV offOn/Off don’t converge<200 mV Depression
MinorCIS between 600 & 850 mV off
200
300
400
500
600
700
800
900
P/S
Pote
ntia
l (-m
V)
OnOffCriteria
300
400
500
600
700
800
900
1000P/
S Po
tent
ial (
-mV)
OnOffCriteria
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Prioritization Criteria/Integration ProtocolPrioritization Criteria/Integration Protocol
CIS xx
Severe Moderate Minor NI
Severe I S S M Moderate I S M NI Minor I S M NI PC
M
NI I S M NI Severe I S S M Moderate I S M M Minor I S M NI D
CVG
NI S M M NI
I = ImmediateI = ImmediateS = ScheduledS = ScheduledM = MonitoredM = MonitoredNI = No IndicationNI = No Indication
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Line 300A Site Three…Demonstration ProjectPoor Condition
Direct Assessment SurveyPacific Gas & Electric
Line 300A - Section 1 - MP 428.56 to 446.96
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
23110.00 23111.00 23112.00 23113.00 23114.00 23115.00 23116.00 23117.00 23118.00 23119.00 23120.00
Station (100 x feet)
Pipe-
to-s
oil Po
tent
ial (-
Volts
)
P\S OFF P\S ON DCVG (mV) Soil Resistivity (ohm-cm) 0.850 Volts
Sheet 50 of 97Profile A1
286MP 437.69
1464
225 250 200
Pipe Line Marker, FenceOverhead ACTest Station
200 100 275 310 350 45
4587
90 120
125 310
20 35 25 45 35 18
Brow ns Valley Rectifier
Excavate 10 ft.Excavate 10 ft.
Excavated, removed coating, sandblasted
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A Contact Found During an ECDA
CATHODIC SURVEY 22/16-INCHGLENWOOD TO EGC
CIS AND PCM SURVEYMH-12 TO MH-13 OLD WESTBURY RD.
ELLISON AVE.
0.05
0.25
0.45
0.65
0.85
1.05
1.25
1.45
1.65
1.85
2.05
2.25
2.45
LOCATION - FEET
ON - P /CuSO4 VOLTAGE
OFF - P /CuSO4 VOLTAGE
P CM SURVEY - AMP S
JERICHO TNPKE.
NORTHERN STATE PARKWA
ASBURY / ELLISON RECTIFIER
MH-13 DIRECTION OF PCM SURVEY
SOUTHMH-12 TO MH -13, OLD WES TBURY RD., ELLIS ON AVE.
6" DISTRIBUTION GAS MAIN CONTACTING TOP OF 16" FACILITY MAIN
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Direct Examination of ECDA Contact
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Offset for 1948 Distribution Main
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Opportunities to Participate in ECDA Efforts
NGA DA project in NY (~10
companies)
GTI/PRCI/OPS project
GTI/AGA, 5-10 case studies
PG&E DA work in CA
Indirect Exams:
May – Jun. 2003
July – Aug. 2003?
Jun. – Aug. 2003
July – Aug. 2003
Direct Exams:
Jun. – Aug. 2003
Aug. – Sep. 2003?
Aug. – Oct. 2003
Jan. – Mar. 2004
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Opportunities to Participate in ICDA Efforts
ICDA (Wet)GTI/PRCI/OPS/SoCal
Development
ICDA (Dry)GTI/PRCI/OPS/SoCal
Validation
ICDA (Dry)NGA
Demonstration
Assemble integrity data:
Feb. – Jul. 2003
Feb. – Jul. 2003
-
Prioritize corrosion likelihood/model development:
May – Sep. 2003
May – Dec. 2003
May – Aug. 2003
Data analysis: Sep. – Dec. 2003
Dec. – Mar. 2004
Aug. – Dec. 2003
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SummarySummaryPast DA validation results support DA is a valid Integrity Past DA validation results support DA is a valid Integrity Management Process, and supports schedules being the Management Process, and supports schedules being the same as those for ILI and same as those for ILI and HydrotestingHydrotestingPast DA results also support that DA provides additional Past DA results also support that DA provides additional value to the ongoing integrity of the pipe over and above value to the ongoing integrity of the pipe over and above ILI and ILI and HydrotestingHydrotestingThe NPRM should reference the NACE RP0502 The NPRM should reference the NACE RP0502 Remediation provisions need to be consistent with existing Remediation provisions need to be consistent with existing standardsstandardsAdditional data will be available before August to further Additional data will be available before August to further improve confidence and support DAimprove confidence and support DALots of opportunity to participate and continue improving Lots of opportunity to participate and continue improving the processthe process