Predicting and Preventing Hydraulic Blowouts During High Velocity Jet Cleaning of Sewer Lines
Abstract:Many municipal wastewater collection agencies use high velocity jet cleaning to scour sewer lines clogged with roots and other debris. This operation is performed to restore or maintain full capacity in the collection lines. In rare cases, these jetting operations expel air and wastewater from the municipal sewer through connecting laterals to floor drains, water closets, and other plumbing fixtures in nearby homes and businesses. The objective of this research is to determine the circumstances under which sewer line blowouts occur in an attempt to predict and reduce their occurrence. Analysis of field data gathered by the MSDGC shows that sewer blowouts are most likely to occur in pipes with the smallest flow capacity, to the exclusion of other factors commonly thought to be important. Using this information, a simple predictive model was developed based on historical blowout data.
Document Type: Research Article
Publication date: January 1, 2009
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