The Optimum Stepped-Pipe String With Vibration Absorbers for Mining Manganese Nodules, to Reduce Its Maximum Axial Stress

Author:

Cui Gang1,Aso Kazuo1

Affiliation:

1. Department of Mechanical Engineering, Mining College, Akita University, 1-1 Gakuen-cho, Tegata, Akita-city 010 Japan

Abstract

In order to reduce the maximum axial stress produced in the pipe string for mining manganese nodules from deep-sea floors by a pump-lift system, the string is assumed to be a two-stepped pipe string with larger diameter in the upper part. Moreover, a buffer and two pump-modules attached to the string are assumed to be equipped with a vibration absorber. Then, the longitudinal vibration and axial stress caused in the string by the heave-motion of the mining ship are analyzed theoretically for practical cases. The result shows that the maximum axial stress in the optimum stepped pipe-string with the buffer having the optimum vibration absorber is found to be smaller by about 42 percent than the one produced in the uniform pipe string with the same mass and no vibration absorbers.

Publisher

ASME International

Subject

General Engineering

Reference11 articles.

1. Aso K. , KanK., DokiH., and MoriM., 1991a, “The Shape-Effect of Buffer on the Longitudinal Vibration of a Pipe String in the Deep Sea,” Int. Journal of Offshore and Polar Engineering, Vol. 1, No. 2, pp. 154–160.

2. Aso K. , KanK., DokiH., and MoriM., 1991b, “The Drag and Added-Mass Coefficients of Buffers Vibrating Axially in Water,” ASME Journal of Energy Resources Technology, Vol. 113, pp. 80–86.

3. Aso K. , KanK., DokiH., and IwatoK., 1992, “The Effects of Vibration Absorbers on the Longitudinal Vibration of a Pipe String in the Deep Sea—Part 1: In Case of Mining Cobalt Crusts,” Int. Journal of Offshore and Polar Engineering, Vol. 2, No. 4, pp. 309–317.

4. Aso, K., Kan, K., Doki, H., Ohkoshi, T., and Natori, T., 1993, “Vibration-Control of a Pipe String for Mining Manganese Nodules by the Shape of Buffer,” Proc. 3rd Int. Offshore & Polar Eng. Conference, Singapore, Vol. I, pp. 143–148.

5. Aso K. , KanK., DokiH., and OhkoshiT., 1994a, “The Effects of Vibration Absorbers on the Longitudinal Vibration of a Pipe String in the Deep Sea—Part 2: A Case for Mining Manganese Nodules,” Int. Journal of Offshore and Polar Engineering, Vol. 4, No. 1, pp. 62–67.

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