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Considerations in the Hydraulic Design of Pipelines
Expanded Title:During this research the hydraulic performance of a number of pipelines were reviewed by conducting field measurements of the energy losses, from which the roughness of the pipelines was calculated. The calculated roughness's were compared to the documented or referenced roughness for the type of pipe material or liner, from which it was possible to determine the yearly increase of the roughness. The calculated roughness for the different pipelines which were reviewed during this research is well in excess of documented maximum values. In cases where biofilm growth was experienced, the documented long term expected roughness was significantly less than the calculated roughness. This reflects that whenever biofilm growth, the reference to and use of the surface roughness to determine the hydraulic capacity is unfounded. The higher than published values of the yearly increase in roughness, negatively impact the operating capacity of gravity systems and will increase the energy cost of pumping systems. It is therefore imperative that periodic review of the hydraulic performance of conveyance systems should be undertaken.
Date Published:01/02/2016
Document Type:Research Report
Document Subjects:Sanitation - Waterborne sanitation
Document Keywords:Hydrology, Hydropower, Operation and Maintenance
Document Format:Report
Document File Type:pdf
Research Report Type:Technical
WRC Report No:TT 650/16
ISBN No:978-1-4312-0742-8
Authors:Van Vuuren SJ
Project No:K5/2140
Originator:WRC
Organizations:University of Pretoria
Document Size:4 308 KB
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