Graduate Thesis Or Dissertation
 

A portable pumping system for hydraulic excavation of commercial crab pots

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  • The design and testing of a portable pumping system for use in the hydraulic excavation of commercial crab pots buried by ocean sediment was undertaken. The resulting portable system retained the four major components of the pumping systems presently used by commercial fishermen: engine, pump, fire hose, and nozzle. Because present systems are too heavy and unwieldy for use on smaller crab boats, a system of more modest proportions yet equivalent excavating capacity was sought. By using a more effective waterjet nozzle, it became possible to employ a one-cylinder pump-engine combination easily portable by two men. The portable pump and engine were purchased and a nozzle manufactured. The system package was assembled, tested for system flow characteristics, then field tested. The system performed well in a simulation experiment, digging a sizable hole on a sand flat. Limited testing aboard ship indicates that the system performs adequately there as well. Along with meeting the design criteria of performance, durability, portability, and corrosion resistance, the system may be simply fabricated using a metal lathe and basic welding equipment. The cost of the system is comparable to that of presently used systems. Analysis of phenomena associated with crab pot pumping, such as hose drag and nozzle reaction forces, was also performed.
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