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See Chinese contents: DL/T 680-2015 DL/T 680-2015: Specification for electric power industry wear-resistant pipes
This standard specifies the classification, designation, technical requirements, test methods, inspection rules, marking, packaging, storage and transportation of electric power industry wear-resistant pipes. This standard is applicable to the wear-resistant pipes conveying such materials as pulverized coal, coal ash (coal cinder), limestone powder, gypsum slurry, etc.; other pipes with wear-resistant requirements may refer to this standard.
