GB/T 40402-2021Pre-insulated composite plastic pipes with polyethylene casing (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part

1.Structure and Drafting Rules of Standardization Documents" Drafting. This document was proposed by the Ministry of Housing and Urban-Rural Development of the People's Republic of China. This document is under the jurisdiction of the National Urban Heating Standardization Technical Committee (SAC/TC455). Drafting organizations of this document. China Academy of Building Research Co., Ltd., Science and Technology and Industrialization Development Center of Ministry of Housing and Urban-Rural Development, China Plastics Processing Industry Association, Fujian Hengjie Plastic New Material Co., Ltd., Yonggao Co., Ltd., Tianjin Junxing Pipe Industry Group Co., Ltd., Lin Haiweixing New Building Materials Co., Ltd., Widis (Shandong) Piping System Co., Ltd., Tianjin Hongtai Pipe Industry Co., Ltd., Chinaust Plastic Products Co., Ltd. Co., Ltd., Zibo Jielin Plastic Pipe Co., Ltd., Guangdong Liansu Technology Industrial Co., Ltd., Zhejiang Zhongcai Pipeline Technology Co., Ltd., Japan Feng Enterprise Group Co., Ltd., Ningxia Qinglong Plastic Pipe Co., Ltd., National Construction Engineering Quality Supervision and Inspection Center, Beijing Construction Project The Fourth Quality Inspection Institute, Jilin Songjiang Plastic Pipe Equipment Co., Ltd., Hubei Jinniu Pipe Industry Co., Ltd., Beijing Thermal Equipment Manufacturing Co., Ltd., Hongyue Plastic Group Co., Ltd., Weihai Shifeng Plastic Co., Ltd., Gudi Technology Co., Ltd., Jilin Province Industry Co., Ltd., Harbin Langest Energy Saving Technology Co., Ltd., Dalian Kehua Heating Pipeline Co., Ltd., Tangshan Xingbang Pipeline Project Equipment Co., Ltd., Langfang Huayu Tianchuang Energy Equipment Co., Ltd., Haotian Energy-saving Equipment Co., Ltd., Shanghai Yueda Energy-saving Technology Co., Ltd. company. The main drafters of this document. Huang Jiawen, Wang Zhanjie, Li Yan, Bai Dongjun, Lin Wenzhuo, Huang Jian, Xu Jianqin, Li Dazhi, Xia Yan, Xue Yanchao, Xiong Zhaoju, Qu Guiran, Wu Yuan, Jin Jijing, Li Yongfeng, Gao Yuanjie, Li Xin, Wang Haorong, Dong Bobo, Yu Xiaojiao, Jia Lihua, Zhang Weifeng, Wang Qian, Xu Huili, Zhong Junkun, Wang Hui, Wang Qingbo, Qiu Xiaoxia, Duan Wenyu, Zheng Zhongsheng, Gong Yujie, Cai Xinhua.

The issuing agency of this document draws attention to the fact that when the declaration conforms to this document, it may involve

5.1.1 and a continuous multi-layer thermal insulation composite pipe, The use of a patent related to corrosion-resistant low-temperature direct-buried thermal insulation heating pipes. The issuing agency of this document has no position on the authenticity, validity and scope of the patent. The holder of the patent has assured the issuing organization of this document that it agrees to license any organization free of charge on a fair, reasonable, and non-discriminatory basis Or an individual implements a patent when implementing the national standard. The statement of the patent holder has been filed with the issuing agency of this document. Relevant information can be Obtained through the following contact information. Name of the patent holder for "a continuous multi-layer thermal insulation composite pipe". Zibo Jielin Plastic Pipe Co., Ltd. Address. No. 6, Qingtian Road, Qilu Chemical Industrial Park, Linzi District, Zibo City, Shandong Province Contact. Xue Yanchao Name of patent holder for "a corrosion-resistant low-temperature direct-buried thermal insulation heating pipe". Tianjin Zhongcai Profile Co., Ltd. Address. No. 55, 11th Street, Economic and Technological Development Zone, Binhai New Area, Tianjin Contact. Gao Yuanjie Please note that in addition to the above patents, certain contents of this document may still involve patents. The issuing agency of this document is not responsible for identifying patents responsibility. Polyethylene outer protective pipe prefabricated thermal insulation composite plastic pipe

1 Scope

China's national standard for pre-insulated composite plastic pipes with a polyethylene casing. It specifies the terms and definitions, the symbols and the requirements. The pipe is a factory-made assembly of three layers: a service pipe carrying the fluid, a layer of rigid polyurethane foam around it, and a polyethylene casing sealing the whole. It is the standard construction for buried district heating and cooling mains, and the reason it is made in a factory rather than insulated in the trench is that the foam must be dry and continuous - insulation applied in a wet trench absorbs water, and wet insulation conducts heat as well as it insulates. The casing is the component that determines the system's life: it is the only barrier between the ground water and the foam, and a puncture during backfilling admits water that migrates along the pipe. District heating networks in northern China run to thousands of kilometres, so the heat lost through this pipe is a national quantity.

This document specifies the structure, classification, code, marking, general regulations, requirements, and tests of prefabricated thermal insulation composite plastic pipes for polyethylene outer protective pipes. Methods, inspection rules, marking, transportation and storage. This document applies to prefabricated thermal insulation composite plastic pipes with polyethylene outer protective pipes used in heating and cooling systems.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to This document.

GB/T 1033.1 Determination of the density of plastic non-foam plastics Part

3 Polyolefin pipes

GB/T 8806 Determination of the dimensions of plastic parts in plastic piping systems

GB/T 8810 Determination of Water Absorption of Rigid Foam Plastic

GB/T 8813 Determination of the compressive properties of rigid foam

GB/T 9345.1 Determination of ash content of plastics Part