Polyurethane foam insulation pipes are widely used in industrial and construction applications due to their excellent thermal insulation properties, durability, and resistance to corrosion and aging. As a leading manufacturer in the field, Dacheng Xiangdong Insulation Refractory Material Factory offers high-quality polyurethane insulation pipes that meet various industry standards. With contact numbers such as 13473696600 and 15731614448, they provide reliable solutions for both domestic and international clients.
The production process of polyurethane foam insulation pipes involves several key steps. First, the inner pipe and outer sleeve are carefully aligned and secured to ensure concentricity. A sealing treatment is applied at the bottom to prevent any leakage during the foaming process. The polyurethane slurry is then injected between the two tubes, where it expands and solidifies into a dense insulating layer. For shorter sections, the pipe is often filled upright, while longer sections may be filled in an inclined position to allow proper flow and even distribution of the material.
In cases where the pipe length is extensive, especially in direct-buried insulation systems, the slurry is typically introduced from the top or bottom using specialized equipment. This ensures uniform filling and minimizes air pockets. However, this method is generally suitable for insulation layers with a thickness of less than 3mm. For larger diameter and longer pipelines, manufacturers often use horizontal injection methods, which allow better control over the foaming process and ensure consistent quality.
When constructing polyurethane insulated direct-buried pipelines, several important precautions must be taken. First, the trench should be properly prepared, with a dry base and a fine sand cushion of about 200 mm thickness. The sides and top of the pipeline should also be covered with at least 200 mm of sand to protect the outer casing and ensure good soil compaction. Additionally, after installation, a hydraulic pressure test at 1.5 times the working pressure is required before proceeding with the joint foaming.
During the foaming process, the surface of the steel pipe joints must be cleaned thoroughly to remove any moisture, oil, or debris. The ambient temperature should not be below 10°C to ensure proper curing of the polyurethane. One-time compensation systems must be preheated according to design specifications, and the temperature should be maintained until the compensator is fully installed or the backfilling is complete.
When the pipeline enters a building or a trench, a wall bushing should be added, and a fixed pier should be placed at the unearthing end to prevent movement. Finally, the backfill must be done in layers and compacted properly to ensure the long-term stability and safety of the pipeline system.
For more information on the production process of polyurethane foam insulation pipes, visit [http://news.chinawj.com.cn](http://news.chinawj.com.cn).
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