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The design of the electrical pump did not only intent to construct a robust and safe

installation but also to create a innovative prototype that may help to gain important

information of alternatives for wave-powered oxygen pumps in areas where the

wave conditions are not sufficient for oxygenation. Also with regards to operational

costs of the pump the design aimed at creating a pump with high efficiency but

with low energy consumption.

Main structure
The main structure consists of a 2.5 m Banana Blade pump which includes high-efficiency, in-line, parallel helical reducers which create a flow rate of up to 4m3/s at an effect of 5 kW. Motor and reducer housings are manufactured with ASTM A48-76 cast iron and fibreglass reinforced polyurethane blades. The mixer is based on extensive experience in the design and manufacturing of submersible equipment by the collaboration partner. The pump is assembled in a steel pump house with a protected inflow. The pump house is connected to a float body by chains. This prevents the pump to be damaged in case of heavy ice conditions as experienced during the last winter. The design also prevents the inflow of floating objects into the pump.
The float with a size of 3 m in diameter and 1 m height has a high bearing capacity and is equipped with the necessary installation for controlling and operating the pump as well as monitoring and safety equipment.   
Vertical tube
The vertical tube that is used for transporting the oxygen-rich surface water to deep waters suffering of oxygen depletion is directly connected to the pump house with help of straps. It has no bearing task except for its own weight and the diffuser that is located at the end of the tube. The tube is 2.5 m in diameter and 95 m long and consists of a plastic material (polyester) with a high tear and tensile strength produced by the Finish company Scantarp Oy. At the end a diffuser plate is attached that also acts as the weight for preventing horizontal movement of the tube. The tube is locally reinforced at a depth of 10 m where a flow meter is installed inside the tube.

The diffuser plate is attached to the tube with help of chains. In addition a wire outside the tube connects the diffuser plate with the pump house. The main function of the diffuser plate is to prevent damaged on the sediments at the sea bottom by the vertical flow from the pump. At the same time, the diffuser will distribute the oxygen-rich water around the tube.

Necessary equipment for operation during demonstration period
The design of the prototype includes the possibility to adjust the pumping and flow rate in order to investigate effects of pumping on the Kanholmsfjärden system. This requires the monitoring of the pumping effect and the pump itself. Therefore, the prototype is equipped with a flow meter inside the tube that provides current flows for various pumping conditions.  
As the pump is driven with electricity a sea cable that goes from the pump to a connection at the land side will be installed. This requires some technical equipment such as safety switches, frequency converter, fuses etc. 

For safety reasons the prototype is further equipped with both GPS and AIS systems as well as various seamarks which identify the approximate position of the pilot. This marking consists of both special marks and lights attached to the prototype.

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