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Polyethylene outer casing opens up new space for anti-corrosion insulation
In various industries such as petrochemicals, water treatment, heating, and industrial refrigeration, traditional anti-corrosion and insulation methods have largely relied on materials like asbestos, ash, or polyurethane. These systems often use asbestos cloth as an outer layer for protection and thermal insulation, but the results are not always satisfactory. Recently, during an interview with the Qilu Petrochemical Life Management Department’s new thermal insulation material factory, a reporter learned about a breakthrough in the field: a prefabricated polyethylene thermal insulation sleeve that can be installed overhead or directly buried. This innovation is opening up new possibilities for corrosion and insulation solutions.
The country is actively promoting and applying this type of eco-friendly building material in construction projects due to its numerous advantages, including environmental sustainability, excellent performance, and ease of installation. As a result, it is gaining increasing popularity in the market.
Li Fujun, director of the Qilu Petrochemical new thermal insulation material factory, explained that the product uses high-density polyethylene for the outer casing. The size of the product can be customized according to customer requirements. The installation is handled by the factory itself. The steel pipe requiring corrosion protection and insulation is placed inside the polyethylene casing, and polyurethane foam is injected into the space between the pipe and the casing, ensuring complete filling. This process creates a solid, integrated structure that effectively provides both corrosion resistance and insulation.
This method allows for either overhead or underground installation, and the entire construction is carried out on-site, making it highly flexible and efficient.
According to reports, compared to traditional direct-buried insulation materials, this polyethylene casing offers several key advantages. It has high mechanical strength, excellent sealing properties, strong resistance to corrosion, low heat loss, and a significantly longer service life. These benefits are achieved through features such as fixed and sliding supports, which help manage thermal expansion and contraction, reducing potential damage to the pipeline.
The material is also highly resistant to water, moisture, acid, alkali, salt, and oil. Its overall design is durable, aesthetically pleasing, and free from deformation. The structure is completely waterproof, preventing any moisture ingress. The polyurethane foam layer ensures that the insulation and outer casing form a unified whole, effectively solving the corrosion issues faced by both overhead and buried pipes.
With a service life of up to 30–50 years—far exceeding the typical 3–5 years of traditional insulation materials—this new technology represents a major advancement in the industry. The polyurethane foam used in the casing also exhibits excellent mechanical and insulating properties, and it can operate safely at temperatures up to 120°C, with short-term exposure to 130°C being acceptable.