Study the effect of the insulating layers on the liquid pipeline leakages and determining the leakage profile calculation model is critical and basic for the leakage-associated fire and explosion risk assessments for the chemical process industry. This research carried out a series of experiments, with an attempt to explore the leakage process of insulated pipeline. The experiments display that the leakage is dynamic, which is divided into three stages: initial, transitional and stable period. During the stable period, both the leak rate and pressure of insulated pipeline responding to work condition are different from those of naked pipeline. Then a fundamental formula is derived from the experimental data which is applicable for leakage calculation with insulating layers. Besides, sensitive factors that affect the leak volume are analyzed, among which the thickness of insulating layer is the most influential one. The research has designed a CFD model to reveal the dynamic leakage process in insulating layers and verify the effectiveness and accuracy of experiments. The result of this paper could improve risk assessment preciseness of liquid pipeline leakage.

研究绝缘层对液体管道泄漏的影响，确定泄漏曲线计算模型对于化工行业与泄漏相关的火灾和爆炸风险评估至关重要，并且是基础。该研究进行了一系列实验，试图探索绝缘管道的泄漏过程。实验表明，泄漏是动态的，分为三个阶段：初始，过渡和稳定期。在稳定期内，绝缘管道的泄漏率和压力对工作条件的响应均不同于裸露的管道。然后从实验数据中得出基本公式，该公式适用于绝缘层的泄漏计算。此外，分析了影响泄漏量的敏感因素，其中绝缘层的厚度影响最大。该研究设计了一个CFD模型，以揭示绝缘层中的动态泄漏过程并验证实验的有效性和准确性。本文的结果可以提高液体管道泄漏风险评估的准确性。