UKOPA dent assessment algorithms: a strategy for prioritising pipeline dents

J.M. Race, J.V. Haswell, R. Owen, B. Dalus, International Petroleum Technology Institute; Pipeline Division

Research output: Contribution to conferencePaper

4 Citations (Scopus)

Abstract

As in-line inspection tools improve, dents that would have been below the detection and reporting levels of previous inspections are now being detected and reported to pipeline operators. Consequently, operators are being faced with large numbers of dents in ILI reports that require further consideration and are left with the problem of how to prioritize these dents for further investigation and repair. Although code guidance is clear on the relative severity of dents associated with other features or those based on a depth or strain criteria, this may still leave a significant number of dents in the pipeline which fall within codified static dent assessment criteria, but which may still pose a threat, particularly from fatigue. Many transmission pipelines in the UK are now 30-40 years old and fatigue failures at dent locations are starting to be reported. Such occurrences have raised technical concerns with regulators regarding the perceived conservatism of current dent assessment methods as the dents in question were within the code limits and were reported through standard ILI technologies, however, they were not identified as significant. There is therefore a requirement to develop best practice guidance for the safe and economic operation of dented pipelines. The UK Onshore Pipeline Association (UKOPA) recognized that further guidance was needed in order that operators could identify dents which can be safely left in the pipeline and those for which further excavation is required. They have consequently developed a series of algorithms to allow pipeline operators to prioritize the dents for repair based on ILI results. This paper describes the background research to these algorithms as well the algorithms themselves, demonstrating their use with ILI dent data from operators of onshore oil and gas pipelines. The paper concludes with comments on the current conservatisms in the analysis of dent fatigue and proposes a way forward to allow pipeline operators to manage large numbers of dents for which the dent fatigue life is critical.
LanguageEnglish
Pages923-933
Number of pages11
DOIs
Publication statusPublished - 1 Oct 2010
Event2010 8th International Pipeline Conference, IPC2010 - Calgary, Canada
Duration: 27 Sep 20101 Oct 2010

Conference

Conference2010 8th International Pipeline Conference, IPC2010
CountryCanada
CityCalgary
Period27/09/101/10/10

Fingerprint

Pipelines
Fatigue of materials
Repair
Inspection
Gas pipelines
Excavation
Mathematical operators
Economics

Keywords

  • assessment criteria
  • assessment methods
  • dented pipelines
  • economic operations
  • fatigue failures
  • in-line inspection tools
  • onshore oil
  • onshore pipelines
  • pipeline operator
  • transmission pipelines
  • algorithms
  • damage detection
  • gas pipelines
  • mathematical operators
  • rating
  • pipeline codes

Cite this

Race, J. M., Haswell, J. V., Owen, R., Dalus, B., & Division, I. P. T. I. P. (2010). UKOPA dent assessment algorithms: a strategy for prioritising pipeline dents. 923-933. Paper presented at 2010 8th International Pipeline Conference, IPC2010, Calgary, Canada. https://doi.org/10.1115/IPC2010-31588
Race, J.M. ; Haswell, J.V. ; Owen, R. ; Dalus, B. ; Division, International Petroleum Technology Institute; Pipeline. / UKOPA dent assessment algorithms : a strategy for prioritising pipeline dents. Paper presented at 2010 8th International Pipeline Conference, IPC2010, Calgary, Canada.11 p.
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title = "UKOPA dent assessment algorithms: a strategy for prioritising pipeline dents",
abstract = "As in-line inspection tools improve, dents that would have been below the detection and reporting levels of previous inspections are now being detected and reported to pipeline operators. Consequently, operators are being faced with large numbers of dents in ILI reports that require further consideration and are left with the problem of how to prioritize these dents for further investigation and repair. Although code guidance is clear on the relative severity of dents associated with other features or those based on a depth or strain criteria, this may still leave a significant number of dents in the pipeline which fall within codified static dent assessment criteria, but which may still pose a threat, particularly from fatigue. Many transmission pipelines in the UK are now 30-40 years old and fatigue failures at dent locations are starting to be reported. Such occurrences have raised technical concerns with regulators regarding the perceived conservatism of current dent assessment methods as the dents in question were within the code limits and were reported through standard ILI technologies, however, they were not identified as significant. There is therefore a requirement to develop best practice guidance for the safe and economic operation of dented pipelines. The UK Onshore Pipeline Association (UKOPA) recognized that further guidance was needed in order that operators could identify dents which can be safely left in the pipeline and those for which further excavation is required. They have consequently developed a series of algorithms to allow pipeline operators to prioritize the dents for repair based on ILI results. This paper describes the background research to these algorithms as well the algorithms themselves, demonstrating their use with ILI dent data from operators of onshore oil and gas pipelines. The paper concludes with comments on the current conservatisms in the analysis of dent fatigue and proposes a way forward to allow pipeline operators to manage large numbers of dents for which the dent fatigue life is critical.",
keywords = "assessment criteria, assessment methods, dented pipelines, economic operations, fatigue failures, in-line inspection tools, onshore oil, onshore pipelines, pipeline operator, transmission pipelines, algorithms, damage detection, gas pipelines, mathematical operators, rating, pipeline codes",
author = "J.M. Race and J.V. Haswell and R. Owen and B. Dalus and Division, {International Petroleum Technology Institute; Pipeline}",
note = "Davis, P.M., (2006) Performance of European Cross-Country Oil Pipelines: Statistical Summary of Reported Spillages - 2004, , CONCAWE; Ironside, S.D., Carroll, L.B., Pipeline dent management program (2002) Proceedings of the 4th International Pipeline Conference, , Calgary, Alberta, Canada : American Society of Mechanical Engineers; McCoy, J., Ironside, S., Dent management program (2004) Proceedings of the 5th International Pipeline Conference, , Calgary, Alberta, Canada : American Society of Mechanical Engineers; Cosham, A., Hopkins, P., The effect of dents in pipelines - Guidance in the pipeline defect assessment manual (2004) International Journal of Pressure Vessels and Piping, 81, p. 127. , American Society of Mechanical Engineers; (2007) ASME B31.8, Gas Transmission and Distribution Piping Systems, , ASME, American Society of Mechanical Engineers; Rosenfeld, M.J., Investigations of dent rerounding behaviour (1998) Proceedings of the 2nd International Pipeline Conference, , Calgary, Alberta, Canada, American Society of Mechanical Engineers; Alexander, C.R., Kiefner, J.F., (1997) Effects of Smooth and Rock Dents on Liquid Petroleum Pipelines, , API1156, American Petroleum Institute; Kiefner, J.F., Alexander, C.R., (1999) Effects of Smooth and Rock Dents on Liquid Petroleum Pipelines (Phase II), , American Petroleum Institute; (2010) Transportation of Natural and Other Gases by Pipeline, , 49CFR192, Revision 02/10, Current through 192-113c, Department of Transportation, 12 February 2010; (2010) Transportation of Hazardous Liquids by Pipeline, , 49CFR195, Revision 02/10, Current through amendment 195-93c, Department of Transportation, 1 February 2010; Dinovitzer, A., Geometric dent characterization (2002) Proceedings of the 4th International Pipeline Conference, , Calgary, Alberta, Canada : American Society of Mechanical Engineers; Dinovitzer, A., Dent integrity assessment (2003) API 54th Annual Pipeline Conference, , Presented at the, American Petroleum Institute; Race, J.M., Dent assessment based on in-line inspection results (2002) Proceedings of the 5th International Conference on Pipeline Rehabilitation and Maintenance, , Manama, Bahrain : GICC; Warman, D.J., Management of pipeline dents and mechanical damage in gas pipelines (2006) Proceedings of the 6th International Pipeline Conference, , Calgary, Alberta, Canada, American Society of Pipeline Engineeers; Baker, M., Dent study - Final report (2004) TTO Number 10, Integrity Management Program, , Delivery Order DTRS56-02-D-70036, DOT Research and Special Programs Administration, Office of Pipeline Safety; Dawson, S.J., Russell, A., Patterson, A., Emerging techniques for enhanced assessment and analysis of dents (2006) Proceedings of the 6th International Pipeline Conference, , Calgary, Alberta, Canada, American Society of Pipeline Engineeers; Rosenfeld, M.J., Porter, P.C., Cox, J.A., Strain estimation using vetco deformation tool data (1998) Proceedings of the 2nd International Pipeline Conference, , Calgary, Alberta, Canada : American Society of Mechanical Engineers, 1998; (1993) Design of Steel Pressure Pipes, Deutsche Norm, , DIN 2413 Part 1; Rinehart, A.J., Keating, P.B., Length effects on fatigue behaviour of longitudinal pipeline dents (2002) Proceedings of the 4th International Pipeline Conference, , Calgary, Alberta, Canada, American Society of Mechanical Engineers, 2002; Rosenfeld, M.J., Deterministic assessment of minor mechanical damage on pipelines (2006) Proceedings of the 6th International Pipeline Conference, , Calgary, Alberta, Canada, American Society of Pipeline Engineeers; (2003) Recommended Practice 2A - Planning, Designing and Constructing Fixed Offshore Platforms, , API-RP2A, American Petroleum Institute; (1984) Offshore Installation: Guidance on Design and Construction, , UK Department of Energy, Department of Energy (DOE); Rosenfeld, M.J., (1997) Development of A Model for Fatigue Rating Shallow Unrestrained Dents, , PRCI Report PR- 218-9405, Catalog No. L51741., Pipeline Research Council International; (1995) Boiler and Pressure Vessel Code, Section VIII, Division 2, , ASME, American Society of Mechanical Engineers; (1996) D1.1-1996, Structural Welding Code - Steel, , AWS, American Welding Society; Corder, I., Chatain, P., EPRG recommendations for the assessment of the resistance of pipelines to external damage (1995) Proceedings of the EPRG/PRC 10th Annual Meeting on Linepipe Research, , Cambridge, UK, April 1995; (2006) ASME B31.4, Liquid Transportation System for Hydrocarbons, Liqid Petroleum Gas, Anhydrous Ammonia and Alcohols, , ASME, American Society of Mechanical Engineers; 2010 8th International Pipeline Conference, IPC2010 ; Conference date: 27-09-2010 Through 01-10-2010",
year = "2010",
month = "10",
day = "1",
doi = "10.1115/IPC2010-31588",
language = "English",
pages = "923--933",

}

Race, JM, Haswell, JV, Owen, R, Dalus, B & Division, IPTIP 2010, 'UKOPA dent assessment algorithms: a strategy for prioritising pipeline dents' Paper presented at 2010 8th International Pipeline Conference, IPC2010, Calgary, Canada, 27/09/10 - 1/10/10, pp. 923-933. https://doi.org/10.1115/IPC2010-31588

UKOPA dent assessment algorithms : a strategy for prioritising pipeline dents. / Race, J.M.; Haswell, J.V.; Owen, R.; Dalus, B.; Division, International Petroleum Technology Institute; Pipeline.

2010. 923-933 Paper presented at 2010 8th International Pipeline Conference, IPC2010, Calgary, Canada.

Research output: Contribution to conferencePaper

TY - CONF

T1 - UKOPA dent assessment algorithms

T2 - a strategy for prioritising pipeline dents

AU - Race, J.M.

AU - Haswell, J.V.

AU - Owen, R.

AU - Dalus, B.

AU - Division, International Petroleum Technology Institute; Pipeline

N1 - Davis, P.M., (2006) Performance of European Cross-Country Oil Pipelines: Statistical Summary of Reported Spillages - 2004, , CONCAWE; Ironside, S.D., Carroll, L.B., Pipeline dent management program (2002) Proceedings of the 4th International Pipeline Conference, , Calgary, Alberta, Canada : American Society of Mechanical Engineers; McCoy, J., Ironside, S., Dent management program (2004) Proceedings of the 5th International Pipeline Conference, , Calgary, Alberta, Canada : American Society of Mechanical Engineers; Cosham, A., Hopkins, P., The effect of dents in pipelines - Guidance in the pipeline defect assessment manual (2004) International Journal of Pressure Vessels and Piping, 81, p. 127. , American Society of Mechanical Engineers; (2007) ASME B31.8, Gas Transmission and Distribution Piping Systems, , ASME, American Society of Mechanical Engineers; Rosenfeld, M.J., Investigations of dent rerounding behaviour (1998) Proceedings of the 2nd International Pipeline Conference, , Calgary, Alberta, Canada, American Society of Mechanical Engineers; Alexander, C.R., Kiefner, J.F., (1997) Effects of Smooth and Rock Dents on Liquid Petroleum Pipelines, , API1156, American Petroleum Institute; Kiefner, J.F., Alexander, C.R., (1999) Effects of Smooth and Rock Dents on Liquid Petroleum Pipelines (Phase II), , American Petroleum Institute; (2010) Transportation of Natural and Other Gases by Pipeline, , 49CFR192, Revision 02/10, Current through 192-113c, Department of Transportation, 12 February 2010; (2010) Transportation of Hazardous Liquids by Pipeline, , 49CFR195, Revision 02/10, Current through amendment 195-93c, Department of Transportation, 1 February 2010; Dinovitzer, A., Geometric dent characterization (2002) Proceedings of the 4th International Pipeline Conference, , Calgary, Alberta, Canada : American Society of Mechanical Engineers; Dinovitzer, A., Dent integrity assessment (2003) API 54th Annual Pipeline Conference, , Presented at the, American Petroleum Institute; Race, J.M., Dent assessment based on in-line inspection results (2002) Proceedings of the 5th International Conference on Pipeline Rehabilitation and Maintenance, , Manama, Bahrain : GICC; Warman, D.J., Management of pipeline dents and mechanical damage in gas pipelines (2006) Proceedings of the 6th International Pipeline Conference, , Calgary, Alberta, Canada, American Society of Pipeline Engineeers; Baker, M., Dent study - Final report (2004) TTO Number 10, Integrity Management Program, , Delivery Order DTRS56-02-D-70036, DOT Research and Special Programs Administration, Office of Pipeline Safety; Dawson, S.J., Russell, A., Patterson, A., Emerging techniques for enhanced assessment and analysis of dents (2006) Proceedings of the 6th International Pipeline Conference, , Calgary, Alberta, Canada, American Society of Pipeline Engineeers; Rosenfeld, M.J., Porter, P.C., Cox, J.A., Strain estimation using vetco deformation tool data (1998) Proceedings of the 2nd International Pipeline Conference, , Calgary, Alberta, Canada : American Society of Mechanical Engineers, 1998; (1993) Design of Steel Pressure Pipes, Deutsche Norm, , DIN 2413 Part 1; Rinehart, A.J., Keating, P.B., Length effects on fatigue behaviour of longitudinal pipeline dents (2002) Proceedings of the 4th International Pipeline Conference, , Calgary, Alberta, Canada, American Society of Mechanical Engineers, 2002; Rosenfeld, M.J., Deterministic assessment of minor mechanical damage on pipelines (2006) Proceedings of the 6th International Pipeline Conference, , Calgary, Alberta, Canada, American Society of Pipeline Engineeers; (2003) Recommended Practice 2A - Planning, Designing and Constructing Fixed Offshore Platforms, , API-RP2A, American Petroleum Institute; (1984) Offshore Installation: Guidance on Design and Construction, , UK Department of Energy, Department of Energy (DOE); Rosenfeld, M.J., (1997) Development of A Model for Fatigue Rating Shallow Unrestrained Dents, , PRCI Report PR- 218-9405, Catalog No. L51741., Pipeline Research Council International; (1995) Boiler and Pressure Vessel Code, Section VIII, Division 2, , ASME, American Society of Mechanical Engineers; (1996) D1.1-1996, Structural Welding Code - Steel, , AWS, American Welding Society; Corder, I., Chatain, P., EPRG recommendations for the assessment of the resistance of pipelines to external damage (1995) Proceedings of the EPRG/PRC 10th Annual Meeting on Linepipe Research, , Cambridge, UK, April 1995; (2006) ASME B31.4, Liquid Transportation System for Hydrocarbons, Liqid Petroleum Gas, Anhydrous Ammonia and Alcohols, , ASME, American Society of Mechanical Engineers

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N2 - As in-line inspection tools improve, dents that would have been below the detection and reporting levels of previous inspections are now being detected and reported to pipeline operators. Consequently, operators are being faced with large numbers of dents in ILI reports that require further consideration and are left with the problem of how to prioritize these dents for further investigation and repair. Although code guidance is clear on the relative severity of dents associated with other features or those based on a depth or strain criteria, this may still leave a significant number of dents in the pipeline which fall within codified static dent assessment criteria, but which may still pose a threat, particularly from fatigue. Many transmission pipelines in the UK are now 30-40 years old and fatigue failures at dent locations are starting to be reported. Such occurrences have raised technical concerns with regulators regarding the perceived conservatism of current dent assessment methods as the dents in question were within the code limits and were reported through standard ILI technologies, however, they were not identified as significant. There is therefore a requirement to develop best practice guidance for the safe and economic operation of dented pipelines. The UK Onshore Pipeline Association (UKOPA) recognized that further guidance was needed in order that operators could identify dents which can be safely left in the pipeline and those for which further excavation is required. They have consequently developed a series of algorithms to allow pipeline operators to prioritize the dents for repair based on ILI results. This paper describes the background research to these algorithms as well the algorithms themselves, demonstrating their use with ILI dent data from operators of onshore oil and gas pipelines. The paper concludes with comments on the current conservatisms in the analysis of dent fatigue and proposes a way forward to allow pipeline operators to manage large numbers of dents for which the dent fatigue life is critical.

AB - As in-line inspection tools improve, dents that would have been below the detection and reporting levels of previous inspections are now being detected and reported to pipeline operators. Consequently, operators are being faced with large numbers of dents in ILI reports that require further consideration and are left with the problem of how to prioritize these dents for further investigation and repair. Although code guidance is clear on the relative severity of dents associated with other features or those based on a depth or strain criteria, this may still leave a significant number of dents in the pipeline which fall within codified static dent assessment criteria, but which may still pose a threat, particularly from fatigue. Many transmission pipelines in the UK are now 30-40 years old and fatigue failures at dent locations are starting to be reported. Such occurrences have raised technical concerns with regulators regarding the perceived conservatism of current dent assessment methods as the dents in question were within the code limits and were reported through standard ILI technologies, however, they were not identified as significant. There is therefore a requirement to develop best practice guidance for the safe and economic operation of dented pipelines. The UK Onshore Pipeline Association (UKOPA) recognized that further guidance was needed in order that operators could identify dents which can be safely left in the pipeline and those for which further excavation is required. They have consequently developed a series of algorithms to allow pipeline operators to prioritize the dents for repair based on ILI results. This paper describes the background research to these algorithms as well the algorithms themselves, demonstrating their use with ILI dent data from operators of onshore oil and gas pipelines. The paper concludes with comments on the current conservatisms in the analysis of dent fatigue and proposes a way forward to allow pipeline operators to manage large numbers of dents for which the dent fatigue life is critical.

KW - assessment criteria

KW - assessment methods

KW - dented pipelines

KW - economic operations

KW - fatigue failures

KW - in-line inspection tools

KW - onshore oil

KW - onshore pipelines

KW - pipeline operator

KW - transmission pipelines

KW - algorithms

KW - damage detection

KW - gas pipelines

KW - mathematical operators

KW - rating

KW - pipeline codes

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Race JM, Haswell JV, Owen R, Dalus B, Division IPTIP. UKOPA dent assessment algorithms: a strategy for prioritising pipeline dents. 2010. Paper presented at 2010 8th International Pipeline Conference, IPC2010, Calgary, Canada. https://doi.org/10.1115/IPC2010-31588