Buoyancy control of large diameter pipelines in Canada using helical screw anchors
Conference
·
OSTI ID:160824
- NOVA Gas Transmission Ltd., Calgary, Alberta (Canada)
Buoyancy control of pipelines transversing wet areas is a significant concern to pipeline owners, designers and contractors. Traditionally, concrete weights have been used in Canada to control the buoyancy of large diameter pipelines crossing muskeg swamps. In an effort to reduce the high cost of concrete weighting, alternate methods have been investigated by NOVA Gas Transmission Ltd. (NGTL). It was determined that helical screw anchors may offer a cost effective method of buoyancy control for NPS (Nominal Pipe Size) 20 and larger natural gas pipelines. This paper deals with the development, design, installation and economics of this pipeline buoyancy control method. A discussion of NGTL`s findings and current construction practice is presented.
- OSTI ID:
- 160824
- Report Number(s):
- CONF-950116--; ISBN 0-7918-1292-8
- Country of Publication:
- United States
- Language:
- English
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