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压力管道是常规岛和电站配套设施的重要设备,加强对它们的管理和检查是一项主要工作,对敏感区域的定义和检验周期的确定是其中一种常用方法,利用它可以更方便地制定检验计划。 相似文献
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防火在核电站设计中占有重要的地位,如何保护核电站重要物项免受火灾的危害,是核电站中常规岛消防设计必须考虑的一个关键性问题,本文通过对常规岛消防设计遵循的规范和系统设计特点进行分类阐述,为核电站消防设计提供工程实例参考. 相似文献
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李青 《现代制造技术与装备》2018,(3)
核电站一回路压力管道是连接一回路主设备的重要管道,是冷却剂的循环通道,需要满足高温、高压、耐腐蚀的工作环境要求。其一般采用奥氏体不锈钢材料制造,也有用铜管、低合金钢内堆焊不锈钢的方式制成。因此,对一回路压力管道的检测尤为重要,介绍了射线检测技术在一回路压力管道奥氏体不锈钢焊缝中的应用。 相似文献
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一、引言在核电站、常规电站和化工厂里,常有许多管道用于输送高压和高速的流体。虽然这些管道设计得能够承受高压,但由于种种原因,在系统中常会有压力的脉动和过高的压力出现。例如,阀的突然开启或关闭可能引起水锤效应;地震、风暴或管道附近某处的爆炸会对管道加上额外的载荷;管道输送的几种介质混合时也可能造成内部的爆炸。此外,管道中压力和温度的变化以及由流动造成的振动,会产生气穴、腐蚀、蠕变、疲劳等效应,从而使管道本身机械性质变坏;在核电站中,管道要经 相似文献
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2003年11月15日,国家质量技术监督检验检疫总局委托上海市锅容管特普查登记领导工作小组、上海市技监局在上海三枪集团针织九厂召开“全国工业压力管道安全监察现场观摩会”。上海针织九厂副厂长章松熊作了“三枪出击,打赢锅容、管、特普查整治四大战役攻坚战”的交流发言,观摩团现场观摩了压力管道普查登记计算机管理情况,并按设备装置、登记编号绘制压力管道立体示意图和安全附件完好情况表,共观摩了八个设备装置,6172m压力管道。国家质量技术监督检验检疫总局锅炉局隋法波处长高度评价上海市在压力管道普查整治工作中,有效发挥行业管理及… 相似文献
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Hiroto Itoh Yinsheng Li Kazuya Osakabe Kunio Onizawa Shinobu Yoshimura 《Journal of Mechanical Science and Technology》2012,26(7):2055-2058
Probabilistic fracture mechanics is a rational methodology in structural reliability evaluation and risk assessment for aged piping in nuclear power plants. Several probabilistic fracture mechanical analysis codes have been improved or developed in Japan. To verify the reliability and applicability of two of these codes, we did a benchmark analysis using their basic functions in consideration of representative piping systems in nuclear power plants and typical aging mechanisms. Based on the analysis results, we concluded that the analysis results of these two codes are in good agreement. 相似文献
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为解决抚顺某热电厂减温减压器减温水管道振动严重的问题,将阻尼减振技术应用到管道减振中。开展了对减温水管道系统振动频率和速度的现场测量及其图纸资料的搜集,运用有限元分析软件Sap2000建立了管道有限元模型,进行了模态和力学分析,掌握了减温水管道的振动特性,并且对管道进行了阻尼减振模拟仿真,建立了管道振动特性与阻尼减振技术之间的关系。依据模拟仿真的数据结果,提出了解决管道振动的最佳方案。该方案运用阻尼减振技术,在不停机、未改变管道原有结构布置的情况下,在管道的适当位置安装了阻尼器,实现了工程项目的减振改造。实际改造结果表明,安装了阻尼器的管道振动速度达到了管道振动安全标准的要求,能够保证机组长周期、稳定运行。 相似文献
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Vibration has severely increased at the branch pipe of the main steam header since the beginning of commercial operation of
nuclear power plants. Intense broadband disturbance flow at a discontinuous region such as elbows, valves or headers generates
an acoustical pulsation which is propagated through the piping system. The pulsation becomes the source of low frequency vibration
at the piping system. If it coincides with the natural frequency of the pipe system, excessive vibration results. High-level
vibration due to the pressure pulsation related to high dynamic stress, and ultimately, to failure probability fatally affects
the reliability and confidence of the plant piping system. This paper discusses steady-state high vibrations appearing in
the branch piping system due to the effect of acoustical pulsations transmitted from the large main steam header by broadband
turbulence in a 700 MW power plant. The excitation sources and response of the piping system are investigated by using on-site
measurements and analytical approaches. Energy absorbing restraints with additional stiffness and damping factor were designed
and installed to reduce vibration damage. 相似文献
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《Measurement》2015
There have been many reports of fatigue failures of small-bore piping systems such as drain piping, vent piping and instrumentation piping in nuclear power plants that arise from vibration sources such as pumps. To prevent the failures, integrity evaluation of piping is conducted by measuring and analyzing vibration stress in the piping. But, a more efficient and economical measurement method is desirable to evaluate the vibration fatigue in small-bore piping. In this study, a non-contacting measurement method was proposed that is based on optical displacement sensors using light emission diodes (LEDs) to measure the vibration stress. The applicability of the method was discussed based on the vibration experiments using pipe elements and a mock-up piping system. From the experimental results, the proposed method was clarified to be sufficiently applicable and practically useful for the vibration measurement and stress evaluation in small-bore piping systems. 相似文献
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为了解决氨制冷压力管道不停机、不拆保冷层、不排介质就无法实施全面检验的问题,提出了运用X射线数字成像技术和红外热成像技术对氨制冷压力管道实施不停机全面检验方法,并利用试件对检验难点:液氨管道焊缝的无损检测、保冷管道的腐蚀检测及焊缝的咬边、错边检查等项目进行了模拟检测试验。用此方法对氨制冷压力管道进行现场检测,并取样进行对比验证,证明此项技术应用于氨制冷压力管道的不停机全面检验是可行的。 相似文献
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张维果 《机电产品开发与创新》2014,27(6):46-48
介绍了除尘系统管道布置的原则和除尘系统管道计算步骤,分析了除尘系统管道沿程压力损失和局部压力损失,最后根据除尘系统总压损和总风量,确定匹配的风机和马达性能参数。 相似文献
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为了保障核电压力管道安全运行,本文研究了温度对核电站一回路辅助奥氏体不锈钢Z2CND18.12N内压直管在循环载荷作用下棘轮效应的影响。非线性随动硬化模型和C—TDF方法分别用来评定循环载荷作用下内压直管的棘轮效应和棘轮边界。结果发现,直管的棘轮应变主要发生在环向,初始棘轮应变率较大,然后随着循环圈数减小;棘轮应变随着温度的增加而增大;内压直管的棘轮边界与温度无关。 相似文献
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