Screw anchors economically control pipeline buoyancy in muskeg
Journal Article
·
· Oil and Gas Journal
OSTI ID:37580
- NOVA Gas Transmission Ltd., Calgary, Alberta (Canada)
To control buoyancy of large-diameter pipelines that cross such wet areas as muskeg swamps in Alberta Province, Canada, NOVA Gas Transmission Ltd., Calgary, for more than 6 years investigated alternatives to traditional concrete weights. The company`s research indicated that helical screw anchors offer cost-effective buoyancy control for natural-gas pipelines 20-in. OD and larger. Muskegs are organic soils with high water tables, low shear strengths, and low densities (specific gravity of 1.04). NOVA`s experience demonstrated practical and cost benefits of screw anchors to resist uplift forces. And among other benefits, substitution of screw anchors for concrete weights significantly reduced the number of heavy trucks that must be moved across the muskeg. The paper discusses buoyancy control, pipeline adaptation, pipe stresses and corrosion, pipeline construction and screw-anchor installation, economics and other benefits.
- OSTI ID:
- 37580
- Journal Information:
- Oil and Gas Journal, Journal Name: Oil and Gas Journal Journal Issue: 17 Vol. 93; ISSN OIGJAV; ISSN 0030-1388
- Country of Publication:
- United States
- Language:
- English
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