Screw Anchor Buoyancy Control Saves an Estimated $12 Million for Enbridge Pipeline PUBLIC ACCESS

[+] Author Affiliations
Raymond Doering

Enbridge Pipelines Inc.

Randy Robertson

Cyntech Corporation

Paper No. IPC2000-120, pp. V001T02A010; 8 pages
  • 2000 3rd International Pipeline Conference
  • Volume 1: Codes, Standards and Regulations; Design and Constructions; Environmental; GIS/Database Development; Innovative Projects and Emerging Issues
  • Calgary, Alberta, Canada, October 1–5, 2000
  • Conference Sponsors: Pipeline Division
  • ISBN: 978-0-7918-4024-5
  • Copyright © 2000 by ASME


In today’s competitive environment, oil and gas pipeline companies must search for materials and construction methods that reduce project capital costs while maintaining the quality and integrity of the pipeline. Pipeline buoyancy control can be a major cost of large diameter pipelines, particularly for routes that cross wet terrain.

In 1999, Enbridge Pipelines (Athabasca) Inc. constructed the 541 km NPS 30 Athabasca Pipeline from Fort McMurray to Hardisty, Alberta. Because of the substantial areas of muskeg that the pipeline route traversed, Enbridge selected a pipeline anchor system as the primary means of buoyancy control for the project. This new technology saved greater than an estimated $12 million CDN when compared with the cost of concrete set-on weights, which is the traditional method of controlling buoyancy of pipelines in North America.

This paper describes the design of the anchor system selected for this project, details the calculations performed to determine anchor spacing, documents the challenges which were overcome during installation, and analyses the cost savings which were achieved by the use of this technology.

Copyright © 2000 by ASME
Topics: Buoyancy , Screws , Pipelines
This article is only available in the PDF format.



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