局部腐蚀管道的承载能力评估

Evaluation on load-bearing capability in partial corrosive pipeline

根据管道在各种外载荷作用下的应力分布情况,结合有关标准,评估了局部腐蚀管道在内压、温度应力及两者联合作用下的承载能力,提出了相应的计算表达式。计算表明,当热流处于稳定状态时,局部腐蚀管道所能承受的内、外壁增温差为最小值。因此,在温度应力作用下,如果排除热冲击效应,只需考虑热流稳定状态,而不必考虑热流未稳定的瞬间状态。

According to stress distribution conditions of pipelines under various external loading actions and combined with relevant standards, make evaluations on load-bearing capability for partial corrosive pipelines under inner pressure, temperature stress as well as the combined actions of the both, put forward a relevant calculating expression. Calculation showed that when the heat flow is in steady state, temperature-increasing difference in inner, outer pipe walls bearable for partial corrosive pipeline represents a minimum value. Therefore, under the action of temperature stress, if getting rid of thermal shock effect, only need to consider the steady state of thermal flow and not necessary to think of the transient state of unstable thermal flow.