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Dredge water pump2/2/2024 These pontoons were placed alongside the main punt on each side, end on end, and were held together by longitudinal beams lengthwise, and to the main punt by heavy cross-beams, which crossed the deck, extending from 7 ft. wide, and, on each side of this punt, there were three pontoons, the four end ones being 4 ft. The hull or punt of this dredge was 50 ft. in thickness, and revolved at the rate of 430 revolutions per minute. in diameter, and had a cast-iron casing over it of about 1½ ins. This runner was keyed on to a shaft, which was about 2 ins. in diameter, to allow all the water and material to pass through the runner. On one side, the flange was solid, having slight ribs on the outside to strengthen it while, on the other side, there was a circular opening, about 15 ins. wide between the flanges, with four solid vanes greatly curved, on the back, but almost straight on the other face. The runner employed at the Waipapa’ Welman dredge in New Zealand in 1889-90 was 2 ft. The Welman patent pump is in many respects similar to a centrifugal pump the runner, however, is differently constructed, the vanes or blades being merely solid cast-iron junks instead of thin, and, on the inside, greatly curved blades. Characteristic types of suction dredges are the Ball and the Welman. These machines consist essentially of a floating structure, supplied with a powerful pump of centrifugal type, raising sand and water through a suction pipe.
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