首页> 外文会议>2002 ASME Pressure Vessels and Piping Conference, Aug 5-9, 2002, Vancouver, British Columbia, Canada >APPLICATION OF CODE CASE N-597 FOR LOCAL THINNING ASSESSMENT FOR CLASS 1 PIPING
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APPLICATION OF CODE CASE N-597 FOR LOCAL THINNING ASSESSMENT FOR CLASS 1 PIPING

机译:代码案例N-597在1类管道局部变薄评估中的应用

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Process piping components such as elbows, bends and tees experience local wall thinning due to Flow Accelerated Corrosion (FAC). Fitness for service studies of the piping components that are affected by FAC for continued operation have gained importance in light of the plant life extension resulting in economic benefits for the operating utilities. ASME Code Case N-597 provides the guidelines for acceptance for continued service of Classes 2 and 3 piping components experiencing wall thinning during operation. However, for Class 1 systems, the Code Case recommends that the owner develop the methodology and criteria for the assessment of wall thinning. This paper establishes a criteria and methodology for the assessment of thinned Class 1 piping system components. The rules of NB-3221 and NB-3650 of ASME Boiler & Pressure Vessel Code (Ref.1) have been considered in establishing the criteria. The requirements of NB-3221 have been utilized for evaluating the adequacy of pressure design. After meeting this requirement, further evaluation of the piping with thinned area is carried out as per NB-3650 requirements for all loadings corresponding to design and service conditions. To illustrate the criteria and the methodology, an assessment of a sample problem of a locally thinned region in a pipe bend is provided in this paper. Finite element analysis and piping analysis are used for the assessment of the thinned region of the pipe bend. Loading considered includes pressure, deadweight, thermal transients and seismic effects.
机译:由于流动加速腐蚀(FAC),工艺管道组件(例如弯头,弯头和三通)会局部变薄。鉴于工厂寿命的延长,可为受公用事业委员会(FAC)影响的管道部件进行服务研究以使其能够继续运行,因此其适用性研究的重要性已变得越来越重要,从而为运营企业带来了经济利益。 ASME案例N-597提供了接受2级和3级在运行过程中壁变薄的管道组件的继续维修接受准则。但是,对于1类系统,规范案例建议业主设计评估壁薄的方法和标准。本文建立了评估薄型1级管道系统组件的标准和方法。在制定标准时,已考虑了ASME锅炉和压力容器规范(Ref.1)的NB-3221和NB-3650的规则。 NB-3221的要求已用于评估压力设计的适当性。满足此要求后,根据NB-3650的要求,对与设计和使用条件相对应的所有载荷,对变薄面积的管道进行进一步评估。为了说明标准和方法,本文提供了对弯管中局部变薄区域的样本问题的评估。有限元分析和管道分析用于评估弯管的变薄区域。考虑的载荷包括压力,自重,热瞬态和地震影响。

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