American Society of Civil Engineers


Excessive Deflection in Welded Steel Pipe Installation


by Ed Stewart, P.E., M.ASCE, (Principal Civil Engineer, San Diego County Water Authority, 4677 Overland Avenue, San Diego, CA 92123), Gary W. Bousquet, P.E., M.ASCE, (Senior Civil Engineer, San Diego County Water Authority, 4677 Overland Avenue, San Diego, CA 92123), and Christopher Dull, P.E., M.ASCE, (Senior Director, R. W. Beck, Inc.; 15373 Innovation Drive, Suite 390, San Diego, CA 92128)

pp. 1-8, (doi:  http://dx.doi.org/10.1061/40745(146)56)

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Document type: Conference Proceeding Paper
Part of: Pipeline Engineering and Construction: What’s on the Horizon?
Abstract: This paper discusses the causes, affects and remedies for excessive deflection of cement mortar lined and coated welded steel pipe during installation. A case study will examine the installation of 1,350 mm (54-inch) diameter cement mortar lined and coated welded steel pipe constructed on the Moreno Lakeside Pipeline project for the San Diego County Water Authority. Of primary concern is excessive cracking and delamination and the long-term integrity of the mortar lining. Contract specifications for installation will be analyzed paying particular attention to stulling procedures as well as backfill and compaction methods. The affects of in-situ and backfill soil characteristics will also be examined. When excessive deflection is experienced, field investigations are necessary to determine the extent of the damage. Once damaged areas are identified, repair methods need to be assessed. The Moreno Lakeside Pipeline is currently under construction and will be used to illustrate some of the pitfalls that may be encountered with excessive pipe deflection as well as the remedies considered to provide for the long term integrity of the pipeline. This paper will present case data that will assist in future design and installation of cement mortar lined and coated welded steel pipe.


ASCE Subject Headings:
Installation
Deflection
Steel pipes
California