A Review of Methods for Assessing the Remaining Strength of Corroded Pipelines

When corrosion features in pipelines are detected by in-line inspection (ILI), a decision for each to replace, repair or accept and monitor must be made. This decision is based on the prediction of the failure pressure of the corroded pipe and must be accurate without being overly conservative. The US Code of Federal Regulations 49 CFR Parts 192 and 195 stipulate that ASME B31G or RSTRENG be used to assess the remaining strength of corroded pipe. A review of burst test data by Pipeline Research Council International, Inc. (PRCI) in 2000 (PRCI Report Catalog Number L51878) raised concerns that use of these methods can, in some instances, result in predicted failure pressures higher than the recorded burst pressures from tests. For example higher predicted failure pressures were obtained on tests conducted on line pipe of strength grades X60 and above with machined defects of depths 50% to 80% of the pipe wall. The objective of this report is to investigate failure pressure predictions made by common assessment methods used by the pipeline industry, such as ASME B31G, Modified ASME B31G, RSTRENG and others against recorded burst test pressures. The analysis consisted of a number of sensitivity studies or ‘cases’, representing different flow stress definitions and material properties. The assessment methods were applied to an extensive database of burst test results which includes the results of various tests conducted by GL on higher strength line pipe material (grade X80 and X100), which have previously not been published.

• Record URL:
  https://primis.phmsa.dot.gov/matrix/FilGet.rdm?fil=5278
• Summary URL:
  https://primis.phmsa.dot.gov/matrix/PrjHome.rdm?prj=171
• Corporate Authors:

  GL Industrial Services UK Ltd

  Loughborough, Leicestershire  United Kingdom 

  Pipeline and Hazardous Materials Safety Administration

  Department of Transportation
  East Building, 2nd Floor, 1200 New Jersey Avenue, SE
  Washington, DC  United States  20590

  Electricore, Incorporated

  27943 Smyth Drive, Suite 105
  Valencia, CA  United States  91355

  Pipeline Research Council International, Incorporated

  ,    
• Authors:
  • Chauhan, V
  • Brister, J
• Publication Date: 2009-11

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Issue 6.1
• Features: Appendices; Figures; References; Tables;
• Pagination: 190p

Subject/Index Terms

• TRT Terms: Corrosion; Evaluation and assessment; Failure; High strength materials; Methodology; Pipe; Pipe bursting; Pipelines; Sensitivity analysis; Test procedures
• Subject Areas: Data and Information Technology; Maintenance and Preservation; Pipelines;

Filing Info

• Accession Number: 01646265
• Record Type: Publication
• Report/Paper Numbers: 6781
• Contract Numbers: DTPH56-05-T0003 - Project 153; PR-273-0323
• Files: TRIS, ATRI, USDOT
• Created Date: Sep 22 2017 2:24PM