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We are seeking reliable suppliers to cooperate. project quanitiy Min. 80 Km (Distric Heating project)Conformity to ; EN253, EN489, EN728, st-37.2/DIN17100, ISO9330/DIN1626-3, ISO1183/DIN8047-75, ISO1133, ISO/DIN6259-1.2, ISO845, ISO845[t2]7, ISO6761/DIN2559-22 pre-insulated steel pipes preinsulated steel pipes