HYDROTESTING EFFECTS--1. MODEL PREDICTS CRACK GROWTH AND MATERIAL BEHAVIOR

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:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00301388
• 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

• TRT Terms: Cracking; Failure; Forecasting; Mathematical models; Pipelines; Steel
• Uncontrolled Terms: Crack growth
• Old TRIS Terms: Failure theory; Hydrotesting
• Subject Areas: Geotechnology; Highways; Materials; Pipelines; Terminals and Facilities;

Filing Info

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