The production process of polyurethane insulation jacket tubes is a critical procedure 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 products that are widely used in industrial and construction applications due to their excellent resistance to corrosion, aging, and environmental damage.
Polyurethane foam insulation pipes are highly favored for their durability and efficiency in maintaining temperature control. The production process involves injecting a foaming mixture between an inner pipe and an outer casing, allowing it to expand and solidify into a uniform insulating layer. This method ensures optimal thermal performance and structural integrity.
Before the foaming process begins, it's essential to ensure proper alignment and concentricity between the inner and outer tubes. A tight sealing treatment must be applied to prevent any leakage of the foaming material. For shorter sections, the pipes can be filled vertically, while longer lengths are typically filled at an angle to allow the slurry to flow evenly. Depending on the formulation and project requirements, the injection can be done from the top or bottom.
In cases where the pipeline is long, the mixing head delivers the slurry through a tube, which is gradually withdrawn as the material expands. This technique is suitable for insulation layers under 3mm in thickness. For larger diameter and longer pipelines, horizontal direct infusion is commonly used, especially when site conditions and material formulations require such an approach.
Proper installation and construction are equally important. During the laying of the pipeline, the trench should be leveled and kept dry, with a fine sand cushion of approximately 200mm thickness. The sides and top of the insulation pipe should also be covered with a similar layer of sand to protect the outer casing and ensure proper friction around the pipe.
After installation, a hydraulic pressure test at 1.5 times the working pressure is necessary. Once this is passed, the joint area should be cleaned thoroughly, removing any moisture, oil, or impurities before applying polyurethane foaming. The ambient temperature during this process should not fall below 10°C for best results.
For direct-buried pipelines with one-time compensation, preheating according to design specifications is crucial. The temperature must be maintained until the compensation is complete or the backfilling is finished. Additionally, wall bushings should be installed where the pipeline enters buildings or trenches, and fixed piers should be placed at the unearthing end.
Finally, backfilling must be done in layers and compacted properly to ensure the safe and stable operation of the pipeline. The quality of the backfill directly affects the longevity and performance of the system, so it should never be overlooked.
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