DE-Lecture12-Selecting-Pumps

DE-Lecture12-Selecting-Pumps - Dredging Engineering...

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Unformatted text preview: Dredging Engineering Dredging Engineering Lecture 12 Lecture 12 Selecting a Dredging Pump Selecting a Dredging Pump ypes of drives: iesels,- Types of drives: - diesels,- electrical motors,- gas turbines- Constant-power drives Luis Prieto-Portar , 2010 Types of Pump Drives. There are three types of pump drives: 1) Internal combustion engines (mostly diesels); 2) Constant and variable speed electrical motors , and 3) Turbines . 1) Diesel Drives. The vast majority of dredge pump drives are diesel engines. Available power is a combination of horsepower and speed. In other words, travel fast and the ability to pull is low versus travel slow and have a high pulling power. Diesels perform much better than gasoline engines under heavy-duty demands. For that reason they are ubiquitous in the construction industry, due to, Diesels Gasoline 1) fuel is regulated with injectors fuel is regulated with carburetors 2) no electrical ignition requires a sophisticated spark-ignition 3) long service life ~ 6,000 hours modest service life ~ 3,000 hours 4) low fire hazard high fire hazard Dredge pumps are run at low speeds. The speed of the impeller (runner) tip determines the head the pump can produce. However, in dredging, most heads are low, and high speeds are not necessary. Also, the solids that go through a pump are large and heavy, requiring large openings for them to go through the pump. These large openings require large runners, which means that their geometry generates sufficiently high peripheral speeds. Finally, the very high speeds associated with turbines generate problems of cavitation and increased wear of the casing and parts....
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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-Lecture12-Selecting-Pumps - Dredging Engineering...

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