The crack-driving force in line-pipe steel material can be expected to increase as a consequence of cyclic load and hold-time effects. These effects are especially evident during hydrotesting. In addition, repeated hydrotesting can cause cracks to grow at pressures less than achieved in a prior test. These are only two of the major conclusions from full-scale tests of line pipe with patched through-wall flaws and part-through-wall flaws. These tests form the basis for judgments about the accuracy of flaw growth and failure-pressure predictions. For these tests, an engineering model of ductile flaw growth in line-pipe steels based on J-tearing theory was developed to assess flaw growth during hydrotesting. This article, Part 1 of a two-part series, presents that theory. The concluding article discusses the tests conducted and elaborates on the significant conclusions.

  • Availability:
  • Corporate Authors:

    PennWell Publishing Company

    1421 South Sheridan, P.O. Box 1260
    Tulsa, OK  United States  74101
  • Authors:
    • LEIS, B N
    • Brust, F W
  • Publication Date: 1990-2-12

Media Info

  • Features: Figures; References;
  • Pagination: p. 45-48
  • Serial:
    • Oil and Gas Journal
    • Volume: 88
    • Issue Number: 7
    • Publisher: PennWell Publishing Company
    • ISSN: 0030-1388

Subject/Index Terms

Filing Info

  • Accession Number: 00491281
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 28 1991 12:00AM