Home / Standards / GB/T 21448-2017 GB/T 21448-2017 Active Specification of cathodic protection for underground steel pipelines 埋地钢质管道阴极保护技术规范 Standard Type GBT ICS 75.200 CCS E98 Status 现行 Issue Date 2017-12-29 Implementation 2018-07-01 Responsible Dept 国家标准委 Drafting Unit N/A