金属与金属接触型法兰接头预紧方法及密封性能研究
发布时间：2019-02-19 12:39
【摘要】：越来越多的现代工业设备在高温高压等极端环境下运行,为保证设备的长周期安全运行,对螺栓法兰连接系统的密封性能提出了更高的要求。与传统的浮动(FLT)型螺栓法兰接头相比,金属与金属接触(MMC)型螺栓法兰接头的密封面压力恒定,可承受更高的螺栓预紧力,在设备运行参数波动的条件下密封性能更稳定。但现在对MMC型螺栓法兰的预紧方法研究较少,没有成熟的推荐方法。因此,对影响MMC型法兰接头密封性能的拧紧方法进行研究是很有必要的。 结合MMC型螺栓法兰的结构特点和密封原理,本文推荐了一种针对MMC型螺栓法兰接头的拧紧方法。针对该推荐方法,结合ASME PCC-1提出的星形拧紧方式以及改进的替代方法#3,本文以8根螺栓的DN80法兰为例,进行了MMC型螺栓法兰的有限元计算模拟,并与FLT型螺栓法兰进行了对比。结果表明,在相同的拧紧方法下,MMC型法兰接头预紧较快、结果较好,且推荐的方法相较于其他方法具有更好的预紧效果。 本文还搭建了DN80的法兰接头螺栓力及密封性能测试装置,对螺栓拧紧时的螺栓力的变化及不同拧紧方式对螺栓法兰接头的密封性能的影响进行了实验研究,结果表明,对MMC型螺栓法兰接头的推荐方法步骤简单,操作省时,相比于其他方法具有更好的密封效果。
[Abstract]:More and more modern industrial equipments operate in extreme environments such as high temperature and high pressure. In order to ensure the long period safe operation of the equipment, higher requirements are put forward for the sealing performance of bolt flange connection system. Compared with the traditional floating (FLT) bolt flange joint, the sealing surface pressure of the metal-metal contact (MMC) bolt flange joint is constant and can withstand higher bolt pretightening force. The sealing performance is more stable under the condition of fluctuating operation parameters of the equipment. However, there is little research on the pre-tightening method of MMC bolt flange, and there is no mature recommended method. Therefore, it is necessary to study the tightening methods that affect the sealing performance of MMC flange joints. Combined with the structural characteristics and sealing principle of MMC bolt flange, this paper recommends a tightening method for MMC bolt flange joint. In view of the recommended method, combined with the star tightening method proposed by ASME PCC-1 and the improved replacement method # 3, the finite element simulation of the MMC bolt flange is carried out in this paper, taking the DN80 flange of 8 bolts as an example. And compared with FLT bolt flange. The results show that under the same tightening method, the MMC flange joint is preloaded more quickly and the result is better, and the recommended method has better pretightening effect than other methods. The testing device of bolt force and sealing performance of flange joint of DN80 is also built. The change of bolt force during bolt tightening and the effect of different tightening ways on sealing performance of bolt flange joint are studied experimentally. The results show that, The recommended method for MMC bolt flange joint is simple, easy to operate and has better sealing effect than other methods.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH136
本文编号：2426507
[Abstract]:More and more modern industrial equipments operate in extreme environments such as high temperature and high pressure. In order to ensure the long period safe operation of the equipment, higher requirements are put forward for the sealing performance of bolt flange connection system. Compared with the traditional floating (FLT) bolt flange joint, the sealing surface pressure of the metal-metal contact (MMC) bolt flange joint is constant and can withstand higher bolt pretightening force. The sealing performance is more stable under the condition of fluctuating operation parameters of the equipment. However, there is little research on the pre-tightening method of MMC bolt flange, and there is no mature recommended method. Therefore, it is necessary to study the tightening methods that affect the sealing performance of MMC flange joints. Combined with the structural characteristics and sealing principle of MMC bolt flange, this paper recommends a tightening method for MMC bolt flange joint. In view of the recommended method, combined with the star tightening method proposed by ASME PCC-1 and the improved replacement method # 3, the finite element simulation of the MMC bolt flange is carried out in this paper, taking the DN80 flange of 8 bolts as an example. And compared with FLT bolt flange. The results show that under the same tightening method, the MMC flange joint is preloaded more quickly and the result is better, and the recommended method has better pretightening effect than other methods. The testing device of bolt force and sealing performance of flange joint of DN80 is also built. The change of bolt force during bolt tightening and the effect of different tightening ways on sealing performance of bolt flange joint are studied experimentally. The results show that, The recommended method for MMC bolt flange joint is simple, easy to operate and has better sealing effect than other methods.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH136
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