Inspection/Condition Analyses of Large Underground Pipelinesby Glenn E. Noble, Jenny Engineering Corp, Pontiac, MI, USA,
Abstract: Inspection/Condition Analyses of Underground Pipelines (sewers and conduits) will be a necessary function of the pipeline Owner/Operator. The Condition Analyses and Inspection phases are both critical if rehabilitation procedures are to be specified to extend the useful life of the pipeline. Observations should be detailed for further analysis and to develop a comparison base for future inspections. The cause of the observed abnormalities, found during the Inspection phase, should be reviewed as they relate to each other, construction methods and the geo-structure. Unit cost indexed in dollars per lineal feet of conduit vary from 3. 60 to 16. 00 for conduit lengths of 29,000 to 1000 lineal feet respectively. Support mobilization plus inspection unit costs range from sixty to eighty percent of the total Inspection/Condition Report Cost.
Subject Headings: Inspection | Sewer pipes | Conduits | Pipelines | Buried pipes | Rehabilitation
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