某发电厂31号高温高压锅炉的15CrMo钢主蒸汽管道自投入运行到1972年12月共运行了135226小时,当时曾进行了割管鉴定,结果认为可以再继续使用10万小时,自鉴定到目前管道又使用了六年多,累计运行时间达19万小时,拟割管作第二次鉴定,本文在13.5万小时鉴定结果基础上及以后的运行数据,作了进一步分析,认为运行13.5万小时后的管道尚能安全运行20 A power plant No. 31 high-temperature high-pressure boiler 15CrMo steel main steam pipe from put into operation in December 1972 a total of 135,226 hours of operation, when the pipe was identified, the result that can continue to use 100,000 hours since the identification of the current The pipeline has been used for more than six years, the accumulated running time of up to 190,000 hours, to be cut for the second tube identification, this article 135,000 hours in the identification results based on the results and the subsequent operation data for further analysis, that run 135,000 hours After the pipeline is still safe to run 20