Polyurethane prefabricated buried insulation pipe

Polyurethane insulation pipes are highly popular for their excellent performance, convenient construction, and long service life. Their structure consists of three parts: an outer protective layer, insulation layer, and anti leakage layer. The outer protective layer material is polyethylene, fiberglass, or other materials. There are three types of laying methods: direct burial, overhead, and trench laying. Our factory has accumulated a wealth of experience in long-term polyurethane insulation and thermal insulation construction, and its quality has reached national standards, which is highly trusted and praised by customers.

On site construction of polyurethane insulation pipe
1. Directly buried insulated pipelines can be widely used in industrial sectors such as heating networks, geothermal, refrigeration, municipal construction, and petroleum. Adding flame retardants to the protective layer can also be used for overhead pipelines.
2. The burial depth must ensure the safe passage of a ten ton truck, and to minimize heat loss, it should be laid below the ice line. Different areas should be treated according to their specific conditions.
3. The excavation size of the trench should ensure that there is a gap between the pipes and between the pipes and the trench wallInterval of 200-250mm for on-site installation and joint treatment. The bottom of the ditch should be compacted with bricks and soil, and fine sand can be used for paving if necessary.
4. When the buried pipe passes through the highway, its laying depth remains unchanged, but it is not backfilled with soil to form a pipe trench. A reinforced concrete slab or concrete casing is laid on the pipe trench.
5. Between pipes, welding is used (glass fiber reinforced plastic pipe connection process and pressure testing standards are set separately). After the installation of the pipes, a water pressure test (9kg/cm2) is carried out to reduce the pressure by 0.5kg/cm2 within 10 minutes to be qualified. During the welding and installation of the pipes, the bottom of the ditch should be kept free of water, and the joints should be fully cured (48 hours) before the pipes can be placed at the bottom of the ditch to avoid soaking the pipes at the joints and reducing the waterproof, anti-corrosion, and insulation effects.
6. In the installation of insulation pipelines, joint treatment can be carried out while installing, or joint treatment can be carried out after all installations are completed and pressure tests are qualified.
(1) It is very necessary to ensure the waterproof, anti-corrosion, and insulation effects of the joint, and to ensure the on-site conditions of the joint.
(2) The temperature at the joint site should be maintained above 10 ℃ during operation and should not be lower than 5 ℃. Therefore, joint treatment is not suitable in winter, rainy days, and damp or waterlogged ditch bottoms.

The key to polyurethane insulation pipe lies in insulationThe important function is insulation, and 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. high densitypolyethyleneThe shell and fiberglass shell both 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.