Technical evaluation of extended-service liquid chlorine tank-wagon should be based on routine testing while particular emphasis is laid on: weld quality inspection ( nondestructive testing), retest of tank ′ s materials ( mainly by means of hardness testing), survey of wall thickness and strength analysis. 对超期服役的铁路罐车技术评定应在常规检测的基础上,侧重于焊缝质量检查(无损探伤)、罐体材质检查(主要通过硬度测试)、壁厚测定及强度校核。