In the modern industrial and construction sectors, efficient energy use and safe pipeline operation are crucial. Prefabricated polyurethane direct buried insulation pipes, with their excellent performance, have become the ideal choice for many projects and are widely used in heating, refrigeration, oil transportation, gas transportation, and other fields.
The production process of prefabricated polyurethane direct buried insulation pipes is relatively complex and precise, involving several key stages. First is the pretreatment of the steel pipe, selecting seamless steel pipes, spiral steel pipes, or straight seam steel pipes that meet the design requirements. Through advanced shot blasting rust removal technology, the rust removal level of the steel pipe surface reaches Sa2.5 level in the GB8923 – 1988 standard, and the surface roughness reaches R = 12.5 microns in the GB6060.5 – 88 standard, providing a good foundation for the subsequent adhesion of the insulation layer and the outer protective layer.
Next is the production of the polyurethane insulation layer, using the “pipe-in-pipe foaming process.” The treated steel pipe is placed on a bracket inside the outer protective layer (usually a high-density polyethylene pipe), and rigid polyurethane foam raw liquid is injected into the cavity between the steel pipe and the outer protective layer in one go through a high-pressure foaming machine. Under the action of catalysts, foaming agents, surfactants, and other additives, the raw liquid quickly undergoes chemical reactions and foams, filling the entire gap to form a uniform, dense insulation layer. This production method ensures that the insulation layer is closely attached to the steel pipe and the outer protective layer, enhancing the stability of the overall structure.
In urban central heating networks, prefabricated polyurethane direct buried insulation pipes are the main force. They can efficiently transport the heat generated by the heat source to each user end, reducing heat loss during transmission, improving heating efficiency, and reducing energy consumption. At the same time, their excellent waterproof and corrosion-resistant performance ensures the safe operation of the pipeline even when buried underground for a long time, reducing maintenance costs.
In the petrochemical production process, various high-temperature, high-pressure, or corrosive media often need to be transported. Prefabricated polyurethane direct buried insulation pipes can adapt to harsh working environments, not only effectively insulating to prevent adverse effects of media temperature changes on the production process but also resisting media corrosion, ensuring the safe and stable operation of the pipeline and continuity of production.
In summary, prefabricated polyurethane direct buried insulation pipes, with their unique production process, high-quality raw materials, and reasonable structural design, play an important role in many fields, providing reliable assurance for efficient energy use and safe operation of pipeline systems, with broad application prospects.
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