Cable-Supported Overhead Pipeline Crossings: Structure Assessment Plan

Pipeline crossings occur where an underground pipeline crosses over a waterway or other geologic depression instead of boring below the water or valley. One means of bridging the gap is by using cable-supported structures to carry the overhead pipeline from one side to the other. These structures typically are comprised of two tower frames, supported by concrete foundations, from which two main catenary cables are hung across the span with backstay cables anchored into the ground. Suspender cables hang vertically from the main cables, terminating at pipe hangers that directly support the pipeline. After many years of constant use, with only minor maintenance, these structures should be inspected to assess their current condition and determine their remaining useful life expectancy. Without this information, a potentially catastrophic scenario may unfold involving the full or partial collapse of the supporting structure and the potential for a breach in the pipeline. This paper illustrates the field inspection of cable-supported overhead pipeline crossings and the prioritizing of these structures for future maintenance program upgrading. Specialized inspection reports were developed for these structures, comprised of an inspection summary, digital photographs, completed field inspection forms (Microsoft Access database), structure inventory and appraisal data, sufficiency rating calculations, and maintenance recommendations. The overall results of this project will culminate in a manageable structure assessment plan.

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; Photos; Tables;
  • Pagination: 10p
  • Monograph Title: Pipeline Engineering and Construction: What's on the Horizon? Proceedings of the Pipelines 2004 International Conference, August 1-4, 2004, San Diego, California

Subject/Index Terms

Filing Info

  • Accession Number: 01003211
  • Record Type: Publication
  • ISBN: 0784407452
  • Files: TRIS
  • Created Date: Aug 12 2005 3:45PM