Abstract
1. For the first time in Russia a submersible axial-flow dredge pump was developed and tested for installation as a first-stage pump on dredges to reduce the negative pressure before the hold dredge pump and to increase its positive suction head. 2. The use of the axial-flow dredge pump permits increasing the output of the dredge and depth of excavating the underwater borrow pit. With respect to power consumption the axial-flow pipe is 2–3 times more economical than ejection. 3. The small mass of the pump permits mounting it on existing dredges without their alteration. 4. Development and perfection of this direction is quite prospective for hydraulicking.
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