Preventing Sediment Deposition in Inverted Sewer Siphons
Publication: Journal of Hydraulic Engineering
Volume 129, Issue 4
Abstract
Laboratory experiments were carried out to determine minimum self-cleansing velocities for preventing deposition of sediment in upward sloping and vertical pipes of inverted siphons. Tests were made using sediment sizes of 0.78 and 4.3 mm in a pipe of 150 mm diameter for eight angles of inclination between 0 and 90°. The criterion for self-cleansing conditions was defined as the minimum velocity needed to prevent the formation of deposits on the invert of the pipe. For a given sediment concentration the self-cleansing velocity was found to be a maximum at pipe slopes between about 22.5 and 45°. Analysis of the forces acting on sediment particles in inclined pipes led to the development of a formula for predicting self-cleansing velocities taking account of pipe size, sediment size, sediment concentration, and pipe slope.
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References
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Information
Published In
Journal of Hydraulic Engineering
Volume 129 • Issue 4 • April 2003
Pages: 283 - 290
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Oct 29, 2001
Accepted: Apr 11, 2002
Published online: Mar 14, 2003
Published in print: Apr 2003
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