非石棉纤维橡胶垫片失效分析

摘要

The leakage event of a non-asbestos gasket was taken place at the manhole flanged joint of a boiler after more than one-year service.In order to find out the reason of this accident,the spot investigation and gasket performance test were carried out,and the microstructure of some new and failure gaskets was observed by means of scanning electron microscope.The research results indicate that hydrolysis and pulverization of non-asbestos fibers of the gasket caused by steam at the elevated temperature is the main reason resulted in the gasket failure.%一台废热锅炉人孔用非石棉纤维橡胶垫片服役一年多后发生泄漏。通过现场调查和新旧垫片性能对比试验，并在扫描电镜下观察分析了垫片基体和纤维材料的微观组织，发现垫片失效主要是由其内部的增强纤维材料在高温蒸汽下水解、粉化导致强度明显下降而引起的。