GB/T 45357-2025Plastics piping systems on ships - Polyethylene (PE) pipes and fittings (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 for standardization documents" Drafting. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by China Light Industry Federation. This document is under the jurisdiction of the National Technical Committee for Standardization of Plastic Products (SAC/TC48). This document was drafted by: Zhejiang Weixing New Building Materials Co., Ltd., Jiangsu Xinghe Group Co., Ltd., Taizhou Product Quality Supervision Inspection Institute, Gongyuan Co., Ltd., Guangdong Liansu Technology Industry Co., Ltd., Shandong Shengbang Plastic Co., Ltd., Fujian Yatong New Materials Technology Co., Ltd., Rifeng New Materials Co., Ltd., Yada Plastic Products Co., Ltd., Wuzhou Product Quality Inspection Institute, SABIC (China) Research Institute Co., Ltd., China Shipbuilding and Ocean Engineering Design and Research Institute, Beijing Technology and Business University, and Jingjiang Haihong Plastic Technology Co., Ltd. The main drafters of this document are. Zhang Weijiao, Kuang Hongwei, Dou Qingwei, Huang Jian, Yu Hualin, Jing Faqi, Chen Xiaomei, Lv Ailong, Li Yu, Xiao Zhaohua, Feng Dan, Yang Yong, Xiang Aimin, Bao Haichu, Zhang Zuoyuan.

As a mobile structure at sea, ships have high requirements for the reliability and safety of their piping systems. International Maritime Organization IMOA.753(18) The Guidelines for the Application of Plastic Pipes on Board Ships and the Maritime Safety Committee Resolution IMOMSC.313(88) on the Guidelines for the Application of Plastic Pipes on Board Ships The Amendment provides systematic guidance on the design and selection of marine plastic piping systems and becomes the basic standard for classification societies to conduct product certification. However, due to the application location of shipboard pipelines, the medium they transport, and the role or potential impact on the safe operation of ships, there are Therefore, in order to meet the special needs of marine pipelines, the plastic pipes are used to Advantages, it is necessary to correctly select plastic pipes according to product characteristics, working environment and application conditions in accordance with this document. Whether a piping system is "important" depends on the medium it transports, the operating conditions and the location on board where it is installed. "System" refers to those pipeline systems that will not contribute to other accidents and cause greater disasters when they are damaged, and are not easily affected by other accidents. Polyethylene piping systems in other places with special requirements other than fire resistance and conductivity, such as ballast piping systems and domestic hot and cold water piping systems. The above restrictions on polyethylene pipe systems are mainly due to the fact that polyethylene materials themselves do not have the fire resistance, smoke suppression and conductivity required by IMOA.753. The polyethylene pipes and fittings specified in this document are allowed to be laminated, coated or otherwise protected according to IMOA.753. Plastic pipes are used to protect the pipes, so that the pipes installed on site meet the requirements of fire resistance, smoke suppression, conductivity, etc., but these measures can have different materials It is difficult to form a unified product standard for the time being. This document does not involve these protection contents. Some of the performance indicators of polyethylene pipes and fittings specified in this document have a certain correspondence with the indicators specified in IMOA.753. However, due to different terms and conventions, the Chinese and English versions of these indicators do not strictly correspond to each other. Table 1 lists their correspondence. Table

1 Comparison of some indicators in this document and IMOA.753(18) in Chinese and English This document is IMOA.753(18) Internalpressure External pressure resistance Tensile yield stress Vicat softening temperature Distortion temperature Chemical resistance Horizontal combustion (flame spread) Flamespread Although the purpose of this document is to evaluate polyethylene pipes and fittings for marine use, production and inspection according to this document are The test cannot replace other certification projects carried out by classification societies in accordance with their industry specifications and actual needs. The publication of this document may lead to the formation of other marine plastic pipe product standards in the future. Marine plastic piping system polyethylene (PE) pipes and pipe fittings

1 Scope

GB/T 45357-2025 is the Chinese standard for polyethylene pipes and fittings in marine plastics piping systems. Plastic pipework has replaced steel in the ballast, grey water, sanitary, scupper and cooling lines of most new ships, because it does not corrode in sea water and it weighs a fraction of what steel does; what it has to prove instead is that it survives a fire, that it does not build up static, and that the joints hold under the vibration and the movement of a hull. The standard sets the classification, the materials, the dimensions and tolerances, the physical and mechanical requirements, the fire performance and the electrical conductivity requirements where the line demands them, the jointing methods, the test methods, the inspection rules and the marking, packaging, transport and storage. It applies to the design, manufacture and acceptance of PE pipes and fittings for shipboard systems. For a shipyard, a pipe supplier or a classification surveyor working in China, this is the acceptance text.

This document specifies the materials, classification, size, bursting pressure and hydrostatic strength of marine polyethylene (PE) pipes and fittings. The requirements for physical and mechanical properties, system applicability, etc. are described, and the corresponding test methods are specified, as well as the inspection rules, marking, packaging, transportation and storage. Require. This document is applicable to the working temperature not higher than 60°C, the maximum working pressure (MOP) not greater than 1.6MPa, and installed in the ship's ballast water Non-important piping systems in tanks, open decks, tanks, empty spaces, tunnels and guide holes, including ballast water piping systems, domestic water piping systems and grey and black water piping systems. The piping system specified in this document is not suitable for places with requirements such as fire resistance, smoke suppression and conductivity.

Note. It is the responsibility of the relevant parties to appropriately select the products specified in this document based on specific application requirements in combination with relevant laws, regulations, standards and specifications.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document.

GB/T 1033.2 Plastics - Determination of density of non-cellular plastics - Part

3 Polyolefin pipes

GB/T 8806 Determination of dimensions of plastic parts for plastic piping systems

GB/T 9345.1 Determination of ash content in plastics Part