以焊接球墨铸铁法兰管为例,对中国国家标准、国际标准和英国标准中法兰接口的密封性和机械应力型式试验要求以及试验方法的对比和分析。选择合理的试验组合,简化试验过程,进一步规范型式试验所需的材料和工具,可为法兰管产品顺利通过型式试验奠定基础。 Taking welded ductile iron flange pipe as an example, the paper compares and analyzes the requirements of sealing and mechanical stress type test and the test methods of the flange interface in Chinese national standard, international standard and British standard. Selecting a reasonable combination of tests to simplify the testing process and further standardize the materials and tools required for type testing can provide the basis for the successful passage of type testing of flanged pipe products.