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Security Research on Preheating Installation of Directly Buried Pipes

机译：直埋管预热安装的安全性研究

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Local buckling may happen when directly buried pipes with large diameter, highrntemperature and pressure adopt cold installation. When preheated installation isrnoperated in cold water or during the cooling process, it will lead to serious accidentsrnsuch as pipeline rupture, compensator fracture and so on. Based upon the analyzingrnof conditions such as pipeline pressure resistance, radial stability, local buckling andrnpipeline tensile fracture, the study worked out minimum wall thickness and thernfunction formula of lowest and highest temperature limitation for preheating underrnidealized conditions. The correction coefficient of calculation results is proposedrnwith reference to the influence of the possible stress effect generated in construction,rnpipe characteristics and its defects. An important conclusion is drawn: the preheatingrntemperature is not only related to the heating medium temperature variation, but alsornrelated to heating medium pressure, pipeline wall thickness, pipe bedding properties,rnconstruction quality, and pipe characteristics, etc. The minimum wall thickness andrnpreheating temperature range corresponding to the wall thickness can be calculatedrnwhen system temperature and pressure are defined. When preheating temperature isrncontrolled in the temperature range, the heating-supply pipeline is in safe condition;rnin the meanwhile, a great deal of steel can be saved and preheating consumption canrnbe reduced notably.
机译：当大口径，高温，高压的直埋管道采用冷安装时，可能会发生局部屈曲。在冷水中或在冷却过程中使用预热装置时，会导致严重的事故，例如管道破裂，补偿器断裂等。在分析管道抗压性，径向稳定性，局部屈曲和管道拉伸断裂等条件的基础上，研究了最小化壁厚和低温条件下预热的最低和最高温度极限的函数公式。结合施工中可能产生的应力效应，管道特性及其缺陷，提出了计算结果的修正系数。得出一个重要的结论：预热温度不仅与传热介质的温度变化有关，而且还与传热介质压力，管道壁厚，管道垫层特性，施工质量和管道特性等有关。最小壁厚和预热温度范围当定义系统温度和压力时，可以计算出与壁厚相对应的值。当将预热温度控制在该温度范围内时，供热管道处于安全状态；同时，可以节省大量钢材，并可以显着降低预热消耗。

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