高温热油罐罐顶失效撕裂原因分析及建议

Analysis and Suggestion of Roof Plate Tearing of a High Temperature Oil Tank

摘要: 介绍10,000 m^³热油罐在某次收付热蜡油时发生罐顶与筒体连接处焊缝异常撕裂事故。通过计算，详细分析了收付油过程中油罐从压力报警、超出压力表量程、呼吸阀打开、呼吸人孔打开、检尺口打开到罐顶焊缝撕裂各阶段压力变化情况，结合油罐承压有限元计算和应力分析，认为油罐性能正常，事故是上游操作波动、油料含水超标所致，并对此提出措施和建议。

Abstract: An accident of some welding seam between roof plate and cylinder body being torn apart during a process of a 10,000 m³ hot oil tank loading and unloading hot wax oil is hereby analyzed in detail. Based on finite element calculation and stress analysis, the pressure changes inside the vessel in various stages from high pressure alarm being triggered, pressure range being exceeded, breathing valve being opened, breathing manhole being opened to welding section being torn up are also researched and analyzed. The results show that the tank back then was in a good condition, but the hot wax oil containing excessive water due to the abnormal operating fluctuation of upstream device was the main cause. Some preventive measures and suggestions are put forward conse-quently.