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PRCI Thermal Analysis Model for Hot-Tap Welding ——管路设计绘图软件

有两个主要关注的与焊接到服务中管道。第一个是对焊机焊接时的安全性,因为有一个焊接电弧造成管壁被穿透而使所容之物跑掉的风险。第二个问题是焊接时对管道的完整性,焊缝以来使服务中的管道加速变冷酷,这种流动能力的结果从管壁除去热量。这些焊接,因此,可能有坚硬的热影响区(HAZ)和随后的易感性氢开裂。这个模型允许种风险控制,通过限制内表面温度和限制氢开裂的风险控制焊接冷却率。

为开口焊接的PRCI热分析模型是一个独立的、用户友好的Windows应用程序,基于复杂的有限元数学模型。该模型使用专有的有限元解算器在爱迪生焊接研究所(EWI)开发。网格生成功能包括套筒、分支和珠在管几何图形,后者为过滤层和焊缝沉积修理。吸热能力值也可以被预测,用来比较活动区实测值。多文档的用户界面(MDI)允许多个情况下运行和热输入选择曲线是生成的。该模型的设计和开发,以满足需求的API,API 1107,ASME第IX节,BS4515,BS6990,CSA Z662。

There are two primary concerns with welding onto in-service pipelines. The first is for welder safety during welding, since there is a risk of the welding arc causing the pipe wall to be penetrated allowing the contents to escape. The second concern is for the integrity of the pipeline following welding, since welds made in-service cool at an accelerated rate as the result of the ability of the flowing contents to remove heat from the pipe wall. These welds, therefore, are likely to have hard heat-affected zones (HAZ) and a subsequent susceptibility to hydrogen cracking. The model allows burn-through risk to be controlled by limiting inside surface temperature and hydrogen cracking risk to be controlled by limiting weld-cooling rates.

The PRCI Thermal Analysis Model for Hot-Tap Welding is a stand-alone, user-friendly Windows application based on a complex finite element mathematical model. The model uses a proprietary finite-element solver developed at Edison Welding Institute (EWI). Mesh generation capabilities include sleeve, branch, and bead-on-pipe geometries, the latter for buttering layers and weld deposition repairs. Heat-sink capacity values can also be predicted for comparison with field-measured values. The multi document user interface (MDI) allows multiple cases to be run and heat input selection curves to be generated. The model was designed and developed to meet the requirements of API 1104, API 1107, ASME Section IX, BS4515, BS6990, and CSA Z662.