Abstract
This paper discusses the causes and effects of and remedies for excessive deflection of cement mortar lined and coated welded steel pipe during installation. A case study examines the installation of 1,350-mm (54-in.) 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 are analyzed paying particular attention to stulling procedures as well as backfill and compaction methods. The effects of in-situ and backfill soil characteristics are also 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 is 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 presents case data that will assist in future design and installation of cement mortar lined and coated welded steel pipe.
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