3500吨水压机油水平衡系统的设计及优化

发布时间：2018-04-29 21:34

本文选题：水压试验机 + 油水平衡　；参考：《山东大学》2015年硕士论文

【摘要】：目前,我国是世界上第二大能源生产国和消费国,能源结构不合理,煤炭消费占比过大。十二五期间,国家制定了逐年提高石油天然气在一次能源消费中所占比例的重大方针,带动了包括焊管行业等诸多行业的快速发展。API标准和国标均规定,每根钢管必须进行水压试验,并需要保压一定时间。其目的是检验钢管是否合格,及消除钢管在焊接过程中出现的残余应力。残余应力易导致钢管的疲劳缺陷或应力腐蚀,同时加速冷裂纹的扩展,降低材料的低温韧性,所以进行水压试验是很有必要的。本文以一套3500吨级水压机的油水平衡系统作为研究对象,首先通过力学计算来找出轴向密封水压试验中的失稳点及失稳原因,根据标准规定中的最小钢管确定出钢管水压试验中的油水平衡最小压强差为0.23MPa,施力中心允许偏离量为20mm,并针对其力学模型提出了系统的设计思路。水压试验是钢管生产线上精整区的必备一环,其工作状态由主机的生产速度所决定,按照预精焊机组10m/min的递送速度,每根钢管生产时间所需7.5min,所以根据这一时间可确定钢管在油水平衡系统这一工位的总时间要限制在60s,之后根据各工序的时间分配来设计系统。对于耗时较长的充水过程和打压过程,需要在不影响试验曲线稳定性的前提下尽量缩短其工作时间。系统选取工作压力为12-15MPa,在选型设计中,充分考虑到了系统的可靠性和元件的互换性。通过几条管线的实际生产,可以看出该水压试验机完全能够满足打压时间控制在60s内的设计要求,且对于不同规格的钢管均能实现平稳快速试压,与以前的水压试验系统相比,本套水压试验机的试压曲线更加平稳,稳定性也更强。
[Abstract]:At present, China is the second largest energy producer and consumer in the world. During the 12th Five-Year Plan period, the state formulated a major policy of increasing the proportion of oil and natural gas in primary energy consumption year by year, which led to the rapid development of many industries, including the welded pipe industry. API standards and national standards have all been stipulated. Water pressure test must be carried out for each steel pipe, and the pressure must be kept for a certain time. The purpose is to check whether the steel pipe is up to standard and to eliminate the residual stress in the welding process. The residual stress can lead to fatigue defect or stress corrosion of steel tube, and accelerate the expansion of cold crack and reduce the toughness of material at low temperature, so it is necessary to carry out hydraulic test. In this paper, the oil-water balance system of a 3500 ton hydraulic press is taken as the research object. Firstly, the point of instability and the cause of instability in the axial seal hydraulic test are found out by mechanical calculation. According to the minimum steel pipe specified in the standard, the minimum pressure difference of oil-water balance in water pressure test of steel tube is 0.23 MPa, and the allowable deviation of force center is 20 mm. The design idea of the system is put forward for the mechanical model of the steel pipe. Water pressure test is a necessary link in the finishing zone of steel pipe production line. Its working state is determined by the production speed of the main machine, according to the delivery speed of 10m/min of the pre-finishing welder group, The production time of each steel pipe is 7.5 mins, so it can be determined that the total time of the steel pipe in the position of oil-water balance system should be limited to 60 s, and then the system is designed according to the time distribution of each process. It is necessary to shorten the working time without affecting the stability of the test curve for the process of water filling and pressing which takes a long time. The working pressure of the system is 12-15 MPA. The reliability of the system and the interchangeability of the components are fully considered in the selection design. Through the practical production of several pipelines, it can be seen that the water pressure testing machine can completely meet the design requirements of controlling the pressure time within 60 seconds, and can realize stable and rapid pressure test for steel pipes of different specifications, compared with the previous hydraulic pressure test system. The test curve of the hydraulic tester is more stable and stable.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH871

【参考文献】