Experimental and numerical studies of insulating layers effect on liquid pipelines leakage in chemical plants

• Published in: Process safety and environmental protection Vol. 147; pp. 888 - 899
• Main Authors: Fu, Jianmin, Chen, Guoming, Zheng, Xiaoyun, Gao, Qihang, Qiu, Shenxin, Xu, Zhiqian
• Format: Journal Article
• Language: English
• Published: Rugby Elsevier B.V 01.03.2021; Elsevier Science Ltd
• Subjects: CFD simulation; Chemical industry; Chemical plants; Chemical process industries; Experiments; Insulating layer; Insulating layers; Leak rate; Leakage; Liquid pipeline leakage; Process safety; Risk assessment; Thickness; Working conditions; CFD simulation; Insulating layer; Process safety; Liquid pipeline leakage; Risk assessment; Leak rate
• ISSN: 0957-5820; 1744-3598
• DOI: 10.1016/j.psep.2021.01.014

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.