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一、前言大型乙烯球形容器(以下简称球罐),是乙烯装置中贮存大量易燃、易爆介质的关键设备之一。乙烯球罐的安全直接关系到装置的长期安全运行及巨大的经济效果,因此防止球罐的低应力疲劳脆性破坏是国内外十分关心的课题。我公司前进化工厂引进4台1900m~3大型乙烯球罐在开罐检测时发现大量裂纹,经有关方面鉴定该球罐伤情严重,应列为监督使用状态,并对超标缺陷按有关规范进行磨修补焊,从而提高乙烯球罐的安全性。乙烯球罐的设计参数为:容量1912.3m~3直径15.4m板厚39.0~40.0mm设计压力为21kgf/cm~2设
I. INTRODUCTION Large-scale vinyl spherical container (hereinafter referred to as spherical tank) is one of the key equipment for storing a large amount of flammable and explosive medium in ethylene plant. The safety of the vinyl tank is directly related to the long-term safe operation of the device and the huge economic effect. Therefore, it is a topic of great concern at home and abroad to prevent the low stress fatigue brittle fracture of the tank. My company forward the chemical plant to introduce four 1900m ~ 3 large-scale vinyl spheres cans found a lot of cracks in the open cans test, identified by the parties concerned the serious injury of the spherical tank, should be listed as the state of supervision, and excessive defects according to the relevant specifications Wear repair welding, thereby increasing the safety of vinyl tank. The design parameters of the vinyl sphere are: Capacity 1912.3m ~ 3 Diameter 15.4m Thickness 39.0 ~ 40.0mm Design pressure 21kgf / cm ~ 2