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• W2016072147 abstract "Lifting Characteristics of Solid Particles by Air-Lift Pump Takeshi Usami; Takeshi Usami National Research Institute for Polfution & Resources Search for other works by this author on: This Site Google Scholar Takayuki Saito; Takayuki Saito National Research Institute for Polfution & Resources Search for other works by this author on: This Site Google Scholar Shigeyoshi Oba Shigeyoshi Oba National Research Institute for Polfution & Resources Search for other works by this author on: This Site Google Scholar Paper presented at the Offshore Technology Conference, Houston, Texas, May 1982. Paper Number: OTC-4297-MS https://doi.org/10.4043/4297-MS Published: May 03 1982 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Usami, Takeshi, Saito, Takayuki, and Shigeyoshi Oba. Lifting Characteristics of Solid Particles by Air-Lift Pump. Paper presented at the Offshore Technology Conference, Houston, Texas, May 1982. doi: https://doi.org/10.4043/4297-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentAll ProceedingsOffshore Technology ConferenceOTC Offshore Technology Conference Search Advanced Search AbstractAn Air-Lift Pump has attracted special interest as one of the lifting techniques for marine mineral resources, because of its simplicity and no underwater moving parts for the pump. The experimental and theoretical studies on this pump-have been also actively done in recent years.The authors carried out the fundamental experiments in indoor apparatus and larger scale of field test in the sea, in order to grasp its lifting characteristics of solids, and more over tried to compare the measured values of lifted solids weight with its calculated ones which were the theoretically derived by applying the momentum equation to the pump model. Concerning the indoor experiments (pipe length: l3.5m), the lifted volume of water and solids and friction head loss were measured by the change of pipe dia. (D=46.7 mm, 75.7 mm, 129.5 mm), pipe inclination (8=90°, 70°, 50°), physical properties of solids and conveying fluids.Concerning the field test in the sea, the lifted volume of water and solids and friction head loss were also measured in the pump with 155.4 mm pipe dia. and about 40 m pipe length, for the comparison with the indoor experimental results. The solids used in the sea water test were simulated manganese nodules with 36.3 mm particle dia. and 1.96 specific gravity.In this paper, the fundamental design criteria for the lifting of solids by air-lift pump are clarified on the basis of these experimental and theoretical results.IntroductionThe air-lift pump has been remarked as one of the effective lifting techniques for marine mineral resources, as it has advantages comparing with other pumps, such as its simplicity and no moving parts except the air compressor. But the systematic research on the air-lift pump has been scarely done, so that studies of Kawashima &Noda, 1)2), Okayama & Yagi3) and Weber4) are only available.The authors grasped the influence of following factors on the lifting characteristics of air-lift pump, through the indoor and seawater test.*pipe diameter, pipe inclination and pipe length*physical properties of solids*specific weight of conveying fluidIn addition, the theoretical equations 5) 6) for lifted solids weight was induced by the momentum theory, and with this result, the comparison between calculated and measured values was made, and furthermore, the examples of numerical calculation on its lifting characteristics were also indicated.Indoor TestFig. 1 shows the schematic experimental apparatus. The unforced suction device was adopted for the solids feeder, and with the rotating drum containing solids rotated by hydraulic motor, the solids surface smoothed by the scraper ® were sucked into the suction pipe (6). As supplying the air into the pipe by the air injector, the solids began to ascend in the pipe to be blown off into the connecting pipe and then proceeded through the flow split pipe (16) and the return pipe (11) to be deposited into the rotating drum, and then circulated to the suction again. Keywords: friction loss, pipe, lifting curve, relation, air injector, truss, simulated nodule, air-lift pump, airlift pipe, injection This content is only available via PDF. 1982. Offshore Technology Conference You can access this article if you purchase or spend a download." @default.
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• W2016072147 title "Lifting Characteristics of Solid Particles by Air-Lift Pump" @default.
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