Characteristics, Installation Steps, and Key Considerations for PE Electrofusion Fittings
Time:
2021-11-26 12:31
Electrofusion fittings are plastic (polyethylene) pipe fittings that achieve a secure joint by melting and fusing the mating surfaces through resistive heating generated by an electric current. Electrofusion Fittings Capacity (i.e., amperage) is the primary parameter; in some low-voltage circuits where voltage requirements are not stringent, only the amperage rating is indicated.
Characteristics of PE electrofusion fittings: In the sales and application of polyethylene piping systems, fittings account for approximately 15% to 20% of total sales. Polyethylene piping system fittings are mainly categorized into two types: fusion-welded fittings and electrofusion fittings. In engineering applications, fusion-welded fittings are used more frequently than electrofusion fittings due to their lower cost; however, electrofusion fittings play an important and irreplaceable role in both construction and maintenance, particularly because they are less susceptible to external environmental conditions and human error during installation. Notably, the use of electrofusion fittings is increasingly prevalent in gas pipeline projects. At the same time, given their higher unit price, greater production costs, and more complex manufacturing processes, electrofusion fitting manufacturers enjoy high profit margins, making this segment a popular investment area. Furthermore, since electrofusion fittings are made from PE material, when paired with PE piping systems they effectively address two major challenges associated with traditional piping: corrosion and joint leakage.
Advantages of electrofusion fittings: (1) Long service life and excellent corrosion resistance; (2) Leak-free joints: utilizing Electrofusion Fittings The connection achieves integral integration between the joint and the pipeline, fundamentally ensuring the structural consistency, material compatibility, and uniformity of the PE piping system’s joints and pipe body. (3) It can effectively resist underground movements and end loads: After PE piping systems are joined by welding, joint leakage does not occur, and joints constructed using this method can withstand end loads. Moreover, PE’s stress-relaxation characteristics allow deformation to effectively dissipate stresses; therefore, in most cases, no costly anchoring is required at joints or bends. On the other hand, due to its high toughness—typically exhibiting an elongation at break exceeding 500%—PE piping systems exhibit strong adaptability to differential settlement of the pipeline foundation.
Installation steps for electrofusion fittings: 1. Cut the pipe vertically, insert the socket into the fitting’s pipe connection, and use a scraper to remove the surface oxide layer. 2. Based on the socket depth of the electrofusion fitting, mark the pipe surface with a marker. 3. Insert the pipe into the electrofusion fitting until the marked line is reached; after installation, the pipe’s axis must align with that of the fitting. 4. Secure the pipe and fitting with clamps to prevent misalignment and loosening during welding.
Points to note during the installation of electric fusion fittings: 1. First, during the installation process, Electrofusion Fittings The inner wall and weld areas shall be free of organic matter and contaminants, and a sufficient distance must be maintained during welding to prevent unnecessary damage. 2. The burial site for electrofusion fittings must be located below the permafrost layer. It is important to ensure that the pipeline remains dry and is not submerged in water during installation and welding. 3. In harsh environments with large diurnal temperature variations, it is necessary to use pipe aligners and other devices to promptly secure the pipeline, thereby preventing thermal expansion and contraction from adversely affecting the final weld quality. Additionally, insulation measures should be implemented when temperatures are particularly low to avoid unnecessary losses.
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On January 15, 2018, Zhejiang Qingfa Pipe Fittings Technology Co., Ltd. conducted a completion environmental protection acceptance monitoring in strict accordance with relevant national laws and regulations and the Technical Specifications for Completion Environmental Protection Acceptance of Construction Projects, based on the “Completion Environmental Protection Acceptance Monitoring Report for the Technological Transformation Project of Zhejiang Qingfa Pipe Fittings Technology Co., Ltd.’s Annual Production of 5 Million PE Pipe Fittings,” prepared by Zhejiang Hongbo Environmental Monitoring Co., Ltd.
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