... formulas under different mining conditions. The results show that the farther away from buffer mining collector is, the smaller tilt angle of hose is; and the more difficult solid particles transportation is, the higher critical velocity is needed to avoid pipe clogging, and the more pressure drop...

.... The depth of the sea was about 100m. The lifting system for deep ocean mineral resources includes flexible hoses, lifting pump, buffer, lifting pipes and control/measurements devices. For May and June of 2009, the lifting system was successfully tested. INTRODUCTION Steeply rising oil prices change...

... on the nearly 6,000-m-deep ocean floor (Fig. 2). Its pipe handling and deployment of the 5,000-m-long pipe were automated. ocean floor manganese nodule buffer mining system offshore software pacific ocean data mining operation upstream oil & gas metals & mining miner simulation pipe...

... of the mining system. Effects of the towing velocity of the mining ship and the mining machine, wave period and nodule mass stored in the buffer on dynamic responses of the mining system are analyzed in order to provide scientific basis for optimal design of the deep-ocean mining system. Research results show...

.... INTRODUCTION Popular deep-ocean mining system is usually composed of mining ship, rigid pipe, buffer, flexible hose and mining machine. On the one hand, walking performance of the mining machine is strongly influenced by the flexible hose, which is subjected to itself gravity, buoyancy of seawater, buoyancy...

... ABSTRACT: FEM model built in ANSYS is used to simulate deep-ocean mining pipe. A 3-D nonlinear pipe element model, including vertical pipe, pump, buffer and flexible riser, is established. The model is utilized to analyze the vertical pipe of COMRA's 1000-m sea trial system. First, the static...

... s controlled miner as miner and collector (Fig. 6) are that the self-propelled seafloor miner (RCM) is integrated with the free bottom-end of the pipe, miner-to-buffer link, a buffer at the pipe s bottom end, and the ocean surface system as a nearly totally integrated system control. The Total...

..., buffer and a self-propelled miner at 5,000-m depth (Chung, JS, 1999). OMI (Ocean Management Inc.) tested in 1978, which included a drill ship, a lift pipe subsystem with a 5500m long pipe string and a towed collector. The same year OMA (Ocean Mining Associates) performed two more poly-metallic nodule...

... domain. A 3-D nonlinear analysis method based on lumped-mass method and incremental-iterative scheme was used. Time integration was conducted by using Newmark method. Underwater pumps and buffer were regarded as a rigid element. Upon the simulations evaluation, two consideration points for lifting pipe...

... ABSTRACT: An articulated deep ocean pipe system with its bottom-end free is presented as part of the industry application phase of the ongoing cobalt-rich manganese research project. The articulation reduces the stringent requirements on the buffer-miner slant range during the miner" s...

... ABSTRACT: In order to reduce the amplitude of longitudinal vibration and the axial stress induced in the pipe string for mining manganese nodules from deep sea-floors, various countermeasures, such 8S the utilization of the shape-effect of the buffer equipped at the lower end of the string...

... viscous drag forces. A lumped-mass method is developed for numerical analysis of 3-D nonlinear pipe behaviour. 3-D nonlinear simulations of a vertical mining pipe are carried out in time-domain by using the Newmark-β method. Effect of underwater pump modules and buffer on the dynamics of pipe string...

... ABSTRACT: In order to reduce the longitudinal vibration of the pipe string in mining manganese nodules from deepsea bottoms, the investigation of the shape effects of various buffers attached to the string reported that the resonance amplitude of the buffer whose shape caused a larger drag...

... and Zheng, 1995) with the merit of changing eigenfrequencies and changing 3-D response characteristics, including torsion. Also, it was shown that the mass or buffer at the bottom end of the pipe (Chung and Whitney, 1981) and the axial vibration absorbers along the pipe with no joints (Aso, 1992 and 1994...