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Mechanics of a Grip System of Three-Key-Board Hydraulic Tongs Developed for Offshore Oil Pipe Lines |
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| Authors: | ZHAO Junyou GUO Aiju DING Keqin and LIU Chuntu Lecturer Petroleum University of China Shangdong P R China Engineer Zhongyuan Petrochemical Corporation Henan P R China Postdoctoral Fellow |
| Institution: | ZHAO Junyou,GUO Aiju,DING Keqin and LIU Chuntu Lecturer,Petroleum University of China,Shangdong 257012,P. R. China. Engineer,Zhongyuan Petrochemical Corporation,Henan 457000,P. R. China. Postdoctoral Fellow,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100080,P. R. China. Professor,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100080,P. R. China.) |
| Abstract: | This paper carries out the analysis of mechanics of a grip system of three-key-board hydraulic tongs developed for offshore oil pipe lines which has been successfully used in oil fields in China. The main improvement of this system is that a lever frame structure is used in the structural design, which reduces greatly the stresses of the major components of the oil pipe tongs. Theoretical analysis and numerical calculation based on thirteen basic equations developed show that the teeth board of the tongs is not easy to slip as frequently happens to other systems and is of higher reliability. |
| Keywords: | grip system three-key-board hydraulic tongs ofjshore oil pipe lines stress analysis |
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