Polyurethane insulation pipe

The key to polyurethane insulation pipes lies in insulation, and their important role is insulation. Being able to provide insulation is crucial. The insulation layer is tightly bonded to the outer skin of the steel pipe, isolating the infiltration of air and water and providing good anti-corrosion effect. At the same time, its foam pores are all closed, and its water absorption is very low. Both high-density polymer shells and fiberglass shells have good anti-corrosion, insulation, and mechanical properties. Therefore, the outer skin of the working steel pipe is difficult to be eroded by external air and water.

Choosing this type of product also requires an understanding of its specific performance characteristics, as different sizes, specifications, and parameters require different installation requirements for polyurethane insulation pipes. Especially under changes in temperature difference, there may be some cold shrinkage. Therefore, we need to take this into account during installation and construction, especially when installing in special situations, which also requires special attention!

Density testing and various measurements of black jacket polyurethane insulation pipe:

1. The density of foam at any position of polyurethane insulation layer shall not be less than 60kg/m3. The surface of foam is smooth and clean, without sticking or shrinking, and the foam holes are even, without collapse or cracking.

2. The foam body of the prefabricated directly buried pipe shall be free of dirt, shrinkage, delamination and cracking. The bubbles shall be uniform and dense, and the average size of bubbles measured along the radial direction shall not be greater than 0.5mm. The closed cell rate of foam shall not be less than 88. The foam shall evenly fill the annular space between the working steel pipe and the external protective pipe. When testing as required, the percentage of the total area of voids and bubbles on any insulation layer section to the entire section area should not exceed 5; The size of a single cavity in any direction should not exceed one-third of the thickness of the insulation layer at the same location.

3. The compressive strength of the insulation layer of the directly buried insulation pipe, the radial compressive strength of the insulation layer foam or the compressive stress when the radial relative deformation is 10 shall not be less than 0.3MPa.

4. When sampling the insulation layer of the insulation pipe to test the foam structure, foam density, pressure strength, water absorption and thermal conductivity, the steel pipe and the foam leather covered with the outer cover should be removed, and the layer thickness should be 5mm and 3mm respectively. At least three samples are required for each project, and the samples should be evenly distributed on the same section of the annular insulation layer.