China 'GB/T 41666.7-2024
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 41666.7-2024
Plastic pipe systems for trenchless repair of underground non-pressure drainage networks - Part 7: Spiral winding lining method 地下无压排水管网非开挖修复用塑料管道系统-第7部分:螺旋缠绕内衬法
Issued Date:2024.5.28
Implemented Date:2024.12.1
Issued by:
The Standardization Administration of the People's Republic of China