NUMERICAL SIMULATION OF THE HIGH-PRESSURE PLUGGING CLAMP ONTO THE PIPELINE REPAIR
This paper introduces a new simple type of pipeline repair clamp device in the maintenance of subsea pipeline. Subsea pipeline is an important way in transporting oil and gas in offshore oil fields. With the high efficiency development of offshore oil industry, offshore oil and gas fields are growing each year and also the total length of subsea pipeline. Once the pipeline leaking, it will cause both serious environmental pollution and a heavy loss of property. In the normal pipeline, some accidents of the subsea pipelines have occurred with various kinds of damage due to a lot of reasons such as pipelines running beyond the design range, washing out and error operation, litter impact, media corrosion and other damage etc. Damage to subsea pipelines is mostly unexpected. The maintenance methods and forms are different due to different parameters and different environmental conditions. In this case, sealing is particularly important. Up to now only several companies in the world such as QCS and HYPERTECH have a few similar products, but with complicated installations. This clamp has two semi-circular components with large stiffness. In the components contact surfaces rubbers are embedded. To ensure the sealing quality some rubbers use double-layer structure. Sealing principle is to create a confined space with rubber structure and mechanical structure. By controlling compressed rubber surface and amount of compression to make the contact stress is higher than the working pressure of the pipeline. So the media cant leak out through the contact surfaces. This paper analyzes the clamps thickness and the transition radius onto stress and rubber size on the sealing performance. By establish the finite element model of clamp based on the principle of optimal design, use the pressure and stress in the installation process and installation of fixtures after the completion of the sealing as the objective function and wall thickness as design variables, finally the minimum thickness of clamp under the premise requirements is got. According to the results we propose the minimum size of clamp requirements and different manufacturing views under different conditions. Clamp has been made out and successfully carried out three simulation tests. Tests simulate the real environment with water as the medium, check the installation quality after accordance installation. Result show that working pressure can achieve to 8.5MPa under the safety factor. Finally, according to in-service oil and gas pipelines maintenance practice, subsea pipelines damage and sea-state characters, recommendations are given on the safety operation of subsea pipeline.
clanp rubber phugging leakage FEMA
Hong Zhang Yafeng Ji Yuandong Meng Qingquan Duan Peng Yang
China University of Petroleum(Beijing)Changping,Beijing Offshore Oil Engineering CO.,LTD Tianjin,China
国际会议
The 3rd World Conference on Safety of Oil and Gas Industry(第三届世界石油天然气工业安全会议 WCOGI 2010)
北京
英文
782-788
2010-09-27（万方平台首次上网日期，不代表论文的发表时间）