نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه مهندسی شیمی، واحد مرودشت، دانشگاه آزاد اسلامی، مرودشت، ایران
2 گروه شیمی، واحد مرودشت، دانشگاه آزاد اسلامی، مرودشت، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Natural gas is currently utilized as a major energy source in the energy mix of consumers. The safe transportation of gas is conducted through underground polyethylene pipeline networks. Over time, polyethylene pipes have gradually replaced low and medium-pressure steel pipes due to their advantages, including corrosion resistance and ease of installation. The connection of these pipes is typically achieved using electrofusion couplers or through butt fusion, where a heating wire generates the necessary heat for melting and mixing in the weld area. Initially, the heat generated melts part of the coupler, allowing the molten polyethylene to reach the surface of the pipe within the coupler, melting a layer of it as well. Under specific temperature and pressure conditions, polymer mixing occurs, resulting in a high-strength weld upon cooling.
One significant issue leading to weak welds is the non-standard gap between the pipe and coupler, which creates an air-filled void that hinders heat transfer from the coupler to the pipe. This paper introduces an intermediate material compatible with the materials of both the pipe and coupler to fill the void between them, enhancing heat transfer and facilitating the formation of a strong weld. The electrofusion welding process was simulated using engineering software, analyzing thermal profiles under standard conditions and with the presence of a void. These complete and incomplete thermal profiles were validated against actual welding tests conducted under standard conditions with and without the polyethylene intermediate material. Finally, the strength of samples that incorporated the intermediate material in their welding was assessed through standard destructive testing. The results indicate that utilizing the intermediate material significantly reduces the likelihood of incomplete welds while ensuring that weld strength meets established standards and requirements.
کلیدواژهها [English]
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