China 'GB/T 29047-2012
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 29047-2012
Prefabricated directly buried insulating pipes and fittings with polyurethane [PUR]foamed-plastics and high density polyethylene [PE]casing pipes 高密度聚乙烯外护管硬质聚氨酯泡沫塑料预制直埋保温管及管件
Issued Date:2012-12-31
Implemented Date:2013-09-01
Issued by:
The Standardization Administration of the People's Republic of China