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By Odd-Ivar Lekang

ISBN-10: 0470670851

ISBN-13: 9780470670859

As aquaculture maintains to develop at a quick speed, figuring out the engineering at the back of aquatic creation amenities is of accelerating significance for all these operating within the undefined. Aquaculture engineering calls for wisdom of the numerous common points of engineering akin to fabric expertise, development layout and building, mechanical engineering, and environmental engineering. In this comprehensive booklet now in its moment version, writer Odd-Ivar Lekang introduces those ideas and demonstrates how such technical wisdom should be utilized to aquaculture systems.Review of the 1st variation: 'Fish farmers and different body of workers excited about the aquaculture undefined, providers to the fish farming company and architects and brands will locate this e-book a useful source. The publication can be an immense addition to the cabinets of all libraries in universities and examine associations the place aquaculture, agriculture and environmental sciences are studied and taught.'Aquaculture Europe'A valuable ebook that, optimistically, will encourage successors that attention extra on hot water aquaculture and on large-scale mariculture resembling tuna farming.'Cision

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Example text

Dry placed pumps may also be made self-suctioning by use of a specially designed impeller. Dry placed pumps are normally bolted to a rack that is fixed to the floor. In a submerged pump the motor and the pump chamber are usually built together and enclosed in one unit which is lowered into the water. As for dry placed pumps, it is important to have a good seal between the pump chamber and the motor. The whole must be watertight, to prevent water from entering the motor. The motor is cooled by the ­surrounding water and the casing can be equipped with cooling ribs to facilitate this.

To use several pumps will also improve the reliability because one pump can stop without halting the total water flow to a farm. 23 Throttling on the pressure side may be used to reduce the water flow from a centrifugal pump, but is not a good solution. and hence a reduction in the water flow, according to the pump characteristics. Higher throttling results in a shift to the left on the pump curve. To throttle on the pressure side is only possible for centrifugal pumps, because the water is inhibited from going to the peripheries of the impeller.

Motors is quite complicated and expensive. 22). If, for instance, the normal frequency of the electricity is 50 Hz, reducing it to 40 Hz will reduce the speed of the motor, which will reduce the water flow out of the pump but maintain the head. c. frequency can affect the pump motor; if it is reduced too much, the motor will stop and may be destroyed. The same thing can happen if the frequency is increased to above 50 Hz. The disadvantage of this system is that frequency regulators are quite expensive and some energy loss occurs during frequency transformation.

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Aquaculture Engineering by Odd-Ivar Lekang

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