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一、前言目前,在工业生产中已广泛使用硬聚氯乙烯塑料(下简称PVC)制成大型贮槽、电除雾器、塔设备、烟囱以及风机、泵等塑料定型产品。但对于真空状态下是否可以使用PVC设备的问题,还存在着两种不同的看法,有的单位认为PVC强度低,即使在微真空下工作,塑料设备也容易发生事故。尤其在PVC真空设备发生几次事故以后,在生产中就更不轻意采用PVC真空设备。有的单位经过实践,认为只要设计合理,保证制造质
I. Introduction Nowadays, rigid PVC plastic (hereinafter referred to as PVC) has been widely used in industrial production to make large stereotyped products such as large storage tank, electric demister, tower equipment, chimney, fan and pump. However, there are two different opinions on whether PVC equipment can be used under vacuum. Some people think that the strength of PVC is low and plastic equipment is prone to accidents even when working under slight vacuum. Especially in the PVC vacuum equipment after several accidents, even in the production of even less care with PVC vacuum equipment. Some units through practice, that as long as reasonable design, manufacturing quality assurance