Advantages of polyurethane insulation materials? Dacheng Xiangdong Insulation Refractory Material Factory 13473696600 15731614448
Advantages of polyurethane insulation materials? Dacheng Xiangdong Insulation Refractory Material Factory 13473696600 15731614448
Polyurethane foam insulation pipe is a new type of material integrating waterproof, heat preservation and heat insulation. It is widely used in urban central heating, warm room, cold storage, coal mine, oil pipeline port, chemical industry, natural gas pipeline, direct power burial, central Insulation and cold preservation projects for air-conditioning pipe insulation, cable threading pipes, steam insulation pipes and other industries.
Polyurethane insulation pipes should be popular in petroleum, chemical, urban heat network, municipal construction and other projects with their excellent performance, convenient construction and long service life. The construction precautions for polyurethane insulation pipes are as follows:
1. The groove of the polyurethane insulation pipe should be flattened to ensure the bottom of the groove is dry, and a fine sand cushion of about 200mm thickness is needed. The sides and upper part of the insulation pipe should cover at least 200mm thick fine sand. The purpose is to prevent the hard object from damaging the outer casing, and the second is to use the fluidity of the sand to fully fill the gap around the pipe to ensure sufficient friction.
2, polyurethane insulation pipe one-time compensation direct buried pipeline must be preheated according to the design requirements, to ensure the constant temperature when preheating to the design temperature, and to ensure that the one-time compensator after welding or backfill is completed before cooling .
3. After the installation of the polyurethane insulation pipe is completed, the hydraulic pressure test of 1.5 times working pressure is required. After the water pressure test is passed, the interface foaming treatment can be carried out to ensure the moisture of the surface of the joint steel pipe, the heat insulating end faces on both sides and the surface of the overlapping section outer casing. The oil, impurities and end face protection layer are removed cleanly; the ambient temperature of the interface when using polyurethane foaming should not be lower than 10 °C.
The structural mechanism of polyurethane foam insulation pipe is analyzed as follows:
1. Anti-corrosion layer of polyurethane foam insulation pipe: protect the outer steel pipe to avoid corrosive corrosion of steel pipe and prolong the service life of steel pipe.
2. External protective steel pipe: protect the thermal insulation layer from groundwater erosion, support the working pipe and can withstand certain external loads to ensure the normal operation of the working pipe.
3. Polyurethane foam layer: ensure the temperature of the medium to ensure that the surface of the outer protective tube is kept at normal temperature.
4. Working steel pipe: ensure the normal flow of the conveying medium.
5. Barrier and reflective layer of polyurethane foam insulation pipe: ensure that the organic foam material does not enter the inorganic hard high temperature resistant layer; reflect part of the high temperature resistant layer heat.
6. Inorganic hard insulation layer: high temperature resistance, ensure the interface temperature with the organic insulation layer, and ensure that the foam is not carbonized.
7. The friction reducing layer of polyurethane foam insulation pipe: to ensure the free movement of the working steel pipe thermal expansion and contraction.
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