DE-Lecture13-Pipelines

DE-Lecture13-Pipelines - Dredging Engineering Dredging...

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Unformatted text preview: Dredging Engineering Dredging Engineering Lecture 13 Lecture 13 Pipelines Pipelines teel versus HDPE pipe teel versus HDPE pipe- Steel versus HDPE pipe Steel versus HDPE pipe- Floaters versus Anchors Floaters versus Anchors- Heat Fusion Heat Fusion - Mechanical Couplings Mechanical Couplings Luis Prieto-Portar 2010 Transportation of Solids via Pipelines. Gold-bearing gravels were known to be transported hydraulically via pipelines during the 1850s in California. Since then, the economic advantages of hydraulically transported solids via pipelines have been known for over a century in dredging. In addition to dredging, however, solids are presently being transported this way for coal (Germany, Poland, Russia, France), iron ore (Tasmania, USA), limestone (USA), copper ore (Chile), gilsonite (USA), gold slurry (USA), fly ash (USA), rutile (Sierra Leone), etc. Dredging is a common method of mining gravels and sands for the construction industry, and is called “ placer aggregate mining ”. The same method is used for mineral mining, and of course, dredging for capital, maintenance and remedial works. A proper study of pipeline transport of solids requires a detailed analysis of the flow of solid-liquid mixtures. A good reference is Dr. John Herbich of Texas A&M (see reference at end of lecture). Steel Pipes. Steel pipes are primarily used for very abrasive solids, albeit more expensive than polyethylene pipe. The most common sizes are shown below, High Density Polyethylene Pipes (HDPE). Polyethylene pipes are made from high-density extra-high-molecular-weight organic molecules, called high performance bimodal PE 4710 resins, described using ASTM D 3350. Compared to steel pipes, HDPE pipes are cheaper to installation, maintain, will not rust or corrode, conduct electrical currents, or support bacteria nor algae. The inner walls are hydraulically smooth (c ~ 155 in Hazen-Williams’ formula) and its G s ~ 0.955. The pipes are butt-joined using fusion, and HDPE’s flexibility permit the pipe to conform to channel curves....
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This note was uploaded on 08/29/2011 for the course CGN 4930 taught by Professor Prieto-portar during the Summer '11 term at FIU.

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DE-Lecture13-Pipelines - Dredging Engineering Dredging...

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