By Odd-Ivar Lekang

As aquaculture maintains to develop at a speedy speed, figuring out the engineering in the back of aquatic creation amenities is of accelerating value for all these operating within the undefined. Aquaculture engineering calls for wisdom of the numerous normal elements of engineering reminiscent of fabric know-how, construction layout and development, mechanical engineering, and environmental engineering. In this comprehensive booklet now in its moment variation, writer Odd-Ivar Lekang introduces those rules and demonstrates how such technical wisdom might be utilized to aquaculture systems.Review of the 1st version: 'Fish farmers and different body of workers eager about the aquaculture undefined, providers to the fish farming company and architects and brands will locate this e-book a useful source. The booklet might be a massive addition to the cabinets of all libraries in universities and study associations the place aquaculture, agriculture and environmental sciences are studied and taught.'Aquaculture Europe'A priceless booklet that, expectantly, will encourage successors that spotlight extra on hot water aquaculture and on large-scale mariculture equivalent to tuna farming.'Cision

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22 A frequency transformer changes the ­frequency of the current and may therefore be used to regulate the pump speed. 9kW 3 Throttling By placing a throttle valve on the pressure side, it is possible to close the outlet of the pump (throttle) (Fig. 23). In this way an artificial head is created Water Transport 31 pumps of different sizes. In this way it is possible to couple pumps in and out and by doing this vary the total flow rate (parallel connection) and at the same time achieve an overall high efficiency for all the running pumps.

17). Pipeline characteristics When delivering water through a pipeline, the ­pressure and/or head that the pump has to deliver depends on the flow rate to be pumped through the pipe. If the pump is not running, the only r­ esistance is the fixed static head; however, when the pump starts to work there is in addition a resistance head (manometric head) caused by f­ riction losses in the pipe. The manometric head increases with the flow rate through the pipe. If the pump does not lift the water to a higher level but only overcomes friction in the pipes, there is no static head but only a r­esistance head.

The power requirements are also given in the pump diagram. Here the necessary power that must be supplied to the pump is plotted versus different discharges and heads. The NPSH curve gives information about the necessary ‘over-pressure’ ­ required by the pump which, as described earlier, increases with increasing water flow. 3 mH2O. The supplied (inlet) pressure is the sum of the air pressure and water pressure to the pump impeller. If this is lower than the NPSH requirements shown on the curve, the pump will cavitate.

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