ASME BPVC第VIII卷第2节外压开口设计稳健性研究

B. Millet, K. Ebrahimi, James Lu, K. Kirkpatrick, Bryan Mosher
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引用次数: 0

摘要

在ASME锅炉和压力容器规范中,外压下附在壳体上的喷嘴加固规则与内压下的规则不同。ASME BPVC第I节,第VIII节第1节和第VIII节第2节(2007年以前版)外部压力的加固规则不如内部压力的严格。自2007年版ASME BPVC Section VIII Division 2以来发布的外压加固规则比内压加固规则更严格。以前的规则只要求外部压力的钢筋是内部压力所需钢筋的一半。在目前的BPVC规范中,所需的钢筋与外壳在外部压力下的许用压应力成反比。因此,随着允许的下降,所需的钢筋增加。可以理解的是,这两个部门的外部压力规则不同,但所需的加固量可能要大得多。与BPVC代码的其他部分和EN 13445-3相比,本文将研究当前第2部分规则中可能存在的保守性。本文将回顾每种方法的背景,并提供几种选定的喷嘴和几何形状的有限元分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Study of the Conservatism in ASME BPVC Section VIII Division 2 Opening Design for External Pressure
In the ASME Boiler and Pressure Vessel Code, nozzle reinforcement rules for nozzles attached to shells under external pressure differ from the rules for internal pressure. ASME BPVC Section I, Section VIII Division 1 and Section VIII Division 2 (Pre-2007 Edition) reinforcement rules for external pressure are less stringent than those for internal pressure. The reinforcement rules for external pressure published since the 2007 Edition of ASME BPVC Section VIII Division 2 are more stringent than those for internal pressure. The previous rule only required reinforcement for external pressure to be one-half of the reinforcement required for internal pressure. In the current BPVC Code the required reinforcement is inversely proportional to the allowable compressive stress for the shell under external pressure. Therefore as the allowable drops, the required reinforcement increases. Understandably, the rules for external pressure differ in these two Divisions, but the amount of required reinforcement can be significantly larger. This paper will examine the possible conservatism in the current Division 2 rules as compared to the other Divisions of the BPVC Code and the EN 13445-3. The paper will review the background of each method and provide finite element analyses of several selected nozzles and geometries.
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