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在长输管道的清管过程中,时常伴有段塞流产生,造成管系中含气率和压力的显著变化,导致管系在段塞流的作用下发生机械振动。依据ASME B31.8-2014《气体输送和分配管道系统》标准,运用CAESARⅡ软件建立清管器管系的应力分析模型,并利用时程分析法分析段塞流对管系的冲击振动影响。应力分析结果表明:在持续载荷工况下管道一次应力满足要求,在动态载荷工况下管道二次应力满足要求,并得出管系在操作载荷工况下管口与支架的受力情况;对清管系统的振动分析表明:段塞流出现区域管系振动位移较大,在段塞流出现附近区域支架受力较大,且在持续载荷工况与动态载荷工况共同作用下,最大应力为54.338 MPa,满足应力校核要求。
In the long-distance pipeline pigging process, often accompanied by slug flow, resulting in significant changes in the gas content and pressure in the pipe system, leading to the pipeline in the slug flow under the action of mechanical vibration. According to the standard of ASME B31.8-2014 Gas Delivery and Distribution Pipeline System, the stress analysis model of pigging system was established by using CAESAR Ⅱ software and the influence of slug flow on the impact vibration of pipeline was analyzed by time history analysis. The results of stress analysis show that the primary stress of pipeline meets the requirements under the condition of continuous load and the secondary stress of pipeline meets the requirement under dynamic load condition and the force of the pipe mouth and support under the operating load condition is obtained. Vibration analysis of the pigging system shows that the vibration displacement of the piping system in the slug flow area is large, and the load on the scaffold in the vicinity of the slug flow is large. Under the combined action of continuous load condition and dynamic load condition, the maximum The stress is 54.338 MPa, which meets the stress checking requirement.