The production process of polyurethane foam insulation pipes is a crucial aspect in the manufacturing of high-performance thermal insulation systems. Dacheng Xiangdong Insulation Refractory Material Factory, with contact numbers 13473696600 and 15731614448, specializes in producing these advanced insulation solutions that are widely used in various industries due to their excellent corrosion resistance and long service life.
Polyurethane foam insulation pipes are commonly used in underground and direct-buried pipeline systems because they offer superior thermal insulation properties and durability. The production process typically involves injecting a foaming mixture between an inner pipe and an outer sleeve. This method allows for one-time foaming, ensuring a uniform and dense insulation layer that provides effective heat retention.
Before the injection of the foaming slurry, the inner and outer tubes must be properly aligned and sealed to prevent leakage. For shorter insulation sections, the process can be carried out vertically, while longer sections often require an inclined setup to allow the slurry to flow smoothly during foaming. Depending on the formulation and project requirements, the slurry can be injected from the top or bottom.
In cases where the pipeline is very long, the mixing head's output is guided through a pipe, gradually withdrawing as the material fills the gap. This technique is suitable for standard casing insulation layers up to 3mm thick. However, for large-diameter and long-length pipelines, horizontal direct infusion is often used due to site constraints and material properties.
Proper installation and construction are essential for the performance of polyurethane insulated direct-buried pipelines. Key steps include preparing a level trench with a fine sand cushion of about 200 mm thickness, ensuring the surrounding area is filled with sand to protect the outer casing and provide proper friction. After installation, a hydraulic pressure test at 1.5 times the working pressure is required, followed by careful cleaning and foaming of the joints.
The ambient temperature during foaming should not be below 10°C, and preheating may be necessary for one-time compensation systems. Additionally, wall bushings and fixed piers must be installed at critical points, and backfilling should be done in layers and compacted thoroughly to ensure the pipeline's safe and long-term operation.
For more information about the production process of polyurethane foam insulation pipes, visit [http://news.chinawj.com.cn](http://news.chinawj.com.cn).
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