DON'T BET ON A PIT

Sections of pipe removed from service by Natural Gas Pipeline Co. of American Because of their corroded and pitted condition were subjected to hydrostatic pressure testing to failure, cyclic testing at specified stress levels to failure, consecutive failure and repair to a maximum pipe failure, testing groove-type corrosion, and tensile testing of individual pits. Plaster casts of corroded areas permitted restudy of the areas after failures had occurred. Although these pipes were too corroded to remain in service, no leaks or failures occurred at less than 140% of the maximum operating pressure of the pipe. A mathematical model for predicting failure stresses for both rupture and leaks, developed by Battelle Memorial Institute as part of the NG-18 program of the Pipeline Research Committee of the American Gas Association, was applied to the results of these tests, with indications that the model will predict failure pressure reasonably well and on the conservative side.

  • Supplemental Notes:
    • Symposium presented in St. Louis, Mo., Mar. 20-24,
  • Corporate Authors:

    National Assn Corros Eng Corrosion/72 Tech Symp

    P.O. Box 1499
    Houston, TX  USA  77001
  • Authors:
    • Barkow, A G
  • Publication Date: 1972

Media Info

  • Pagination: 18 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00056131
  • Record Type: Publication
  • Source Agency: American Petroleum Institute
  • Report/Paper Numbers: No. 38 Paper
  • Files: TRIS
  • Created Date: Jun 24 1974 12:00AM