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The pipe flange connection is widely applied in chemical, power plants, petrochemical, offshore oil and gas industries, and its strength and tightness are significant for the safe operation. However, there are still no practical and applicable strength and tightness evaluation methods for pipe flange connections working in dramatically varying temperatures. This paper proposed an approach to evaluate the pipeline's strength and sealing performance considering thermal effects in actual operating conditions by combining the experimental measurement and thermostructural analysis. The critical thermodynamic parameters are identified through measured temperature data in operating conditions, and then these parameters are used in the thermostructural analysis to obtain the actual temperature and stress fields. Then, the strength and tightness in complex temperature cases can be evaluated accurately. The pipe flange connection of a liquefied natural gas (LNG) fueling station is analyzed to verify the presented method's effectiveness. This method applies to evaluating the pipeline's strength and tightness and can predict the pipeline's performances under extreme temperatures using the tested data within the measurement range and the corresponding thermostructural analysis. Furthermore, the work in this paper also provides a reference for the design and analysis of pipe flange connections working in complex temperature conditions. 相似文献
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The vulnerability of major-hazard industrial plants to natural hazards has been recognized as an emergent issue whose importance is underlined by the Sendai Framework, established immediately after the Tohoku earthquake of 2011, in Japan. Hence, seismic risk analysis is of paramount importance as testified by the intense research activity that characterized the last years. In this respect, structural health monitoring can represent a valuable tool able to strongly help the decision-making phase. Along this main vein, optical fibers (OFs) represent a class of sensors able to both monitor critical conditions, as leakage of hazardous material, and activate safety barriers, if any. More precisely, optical fibers represent an economic solution, whose characteristics appear particularly suitable for dangerous environments like major-hazard plants. However, investigations relevant to their use for seismic monitoring of chemical/petrochemical plants are rather limited, especially when subject to strong dynamic excitations. As a result, this paper deals with the analysis of optical fiber Bragg gratings (FBGs) applied to bolted flange joints (BFJ) under cyclic loadings. More precisely, two experimental programs, i.e., a cyclic test on a single BFJ and a series of shaking table tests on BFJs of a multicomponent system, demonstrated the effectiveness of the proposed monitoring systems in detecting hazardous conditions and, thus, their potential use in conjunction with safety barriers. 相似文献
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通过不锈钢球形法兰高翻边引伸的应力、应变分析 ,探讨了带有球形法兰的高翻边的成形特点和成形方法 相似文献
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作为非回转对称成形试验研究的一部分,进行了大量的矩形盒拉深试验。指出纯铜薄板的各向异性对矩形盒拉深成形性的影响不十分显著。增大凸模形状参数rc/w,成形中法兰短边和曲边材料向凹模口的流入速度减小,曲边变形加工度增大,是使成形极限降低的原因之一。rc/w=0.1附近,极限成形高度hmax最大。 相似文献
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着重研究了六角凸缘螺栓冷切挤工艺及其与热墩工艺的比较 ,并介绍了在多工位冷墩机上的模具设计方案。 相似文献
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以一台U型管式a型换热器在进行壳程水压试验时管板与壳体法兰凹面间缠绕垫片被压出泄漏为事例,针对选择低公称压力等级的缠绕垫片用在高设计压力的凹凸面法兰接头密封的影响因素,从垫片最小宽度、法兰凹凸密封面尺寸偏差、垫片与法兰装配以及缠绕垫片特性等方面进行了分析,提出了在设计计算法兰时应考虑垫片最小宽度的合理确定并修订完善相关标准的建议。 相似文献
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目的揭示不同条件下法兰接缝处的腐蚀速率。方法基于流动动力学数值模拟软件,分析法兰接缝处的流场变化、不同因素的电化学腐蚀速率和冲刷腐蚀速率。结果在文中的研究条件下,随着接缝深度的增加,法兰接缝处的流速分布分为0～0.6 mm和0.6～5 mm两个阶段,在法兰接缝表面均存在明显的压力梯度层和温度梯度层。同时随着固体杂质质量流量的增大,法兰处腐蚀速率呈直线增大,当其质量流量大于4kg/s时,其腐蚀速率达到最大值;而含砂流体流速与腐蚀速率基本符合正态分布规律。结论对于气液固多相流条件下法兰处的腐蚀,主要是由于电化学腐蚀和冲刷腐蚀相互作用产生的,并且其冲刷腐蚀速率远远大于电化学腐蚀速率。 相似文献
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以车轮法兰面螺母为例 ,对此类零件的两种成形工艺热压与冷挤工艺进行比较 ,论述了其工艺、变形以及模具设计的相关问题 相似文献
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