Prefabricated directly buried polyurethane insulation steel pipe manufacturer

& Production process of directly buried prefabricated polyurethane insulation pipe Polyurethane foam insulation pipe is a kind of steel pipe that transports the medium, a high-density polyethylene outer casing, and a polyurethane hard foam insulation layer filled between the steel pipe and the outer casing. Just put the rust-removed and anti-corrosion steel pipe into the polyethylene casing, and inject polyurethane foam in the middle to fully fill the gap between the steel pipe and the polyethylene casing, and finally form a strong connection between the steel pipe, casing and insulation layer. Overall, to achieve the effect of anti-corrosion and insulation, this anti-corrosion and insulation method can be elevated or buried underground, and the entire construction process can be carried out on site. Simple process flow Steel pipe inspection, rust removal, anti-corrosion, pipe forming, head repair, finished product inspection, finished product stacking This content is unique to the construction of prefabricated directly buried insulated pipes. The construction quality directly affects the service life. The insulation layer has two methods: on-site foam construction and insulation tile construction. No matter which method is used for construction, defects such as annular spaces, cracking, and delamination cannot occur. There are many ways to maintain the layer (such as high-density polyethylene and fiberglass reinforced plastics). protective layer) but must ensure the integrity, tightness and waterproofness of the joint. The rise speed of polyurethane insulation pipes is slow. This phenomenon generally occurs during construction in autumn and winter or in the morning due to a sudden drop in temperature or low temperature. This can be solved by raising the ambient temperature and black material temperature. Generally, the temperature of the black material is raised to ℃, and the ambient temperature is raised to ℃.
The first layer: the working steel pipe layer. According to the design and customer requirements, seamless pipes (spiral welded pipes) and straight seam welded pipes are generally selected. After the surface of the steel pipe has been treated with advanced shot blasting and rust removal technology, the rust removal grade of the steel pipe can reach the standard level, and the surface roughness can reach the bonding surface between the insulation layer and the steel pipe, making it a whole.
The second layer: polyurethane insulation layer, which is made by injecting rigid polyurethane foam solution into the cavity formed between the steel pipe and the special steel mold using a high-pressure foaming machine. It is commonly known as the mold foaming process. Whether the polyurethane foam is full and there are any quality problems can be directly inspected. Its function is firstly to waterproof, but also to keep heat, and thirdly, to support the weight of the heating network. When the temperature of the transmission medium is: ℃℃, choose hard plastic as the insulation layer. When the temperature of the transportation medium is: ℃℃, choose hard plastic as the insulation layer.
Third layer: The protective layer of fiberglass is made by mechanical wet winding. Its function is to protect the polyurethane insulation layer from damage by mechanical hard objects, and to be anti-corrosion and waterproof. It has good weather resistance, acid resistance, and seawater resistance. However, the resin must use equal rigid and semi-rigid unsaturated resins. Glass fiber and cloth must use medium and low-alkali fiber yarns drawn in platinum crucibles or kilns. It is forbidden to use fiber yarns with high alkali content drawn in earthen crucibles.
& It has high-efficiency insulation, waterproof, It has excellent features such as anti-corrosion, heat insulation, sound insulation, flame retardant, cold resistance, anti-corrosion, light capacity, high strength, simple and convenient construction, and is not afraid of plant root thorns. It has become a popular choice for thermal insulation and thermal insulation in industrial sectors such as construction, transportation, petroleum, chemical industry, electric power, and refrigeration. Waterproofing, sealing and other indispensable materials. Polyurethane insulation pipes are used in various indoor and outdoor pipes, central heating pipes, central air conditioning pipes, chemical, pharmaceutical and other industrial pipes for heat and cold insulation projects, oil pipeline projects, steam transmission and other pipeline projects. Since the birth of polyurethane composite materials in the 1930s, rigid polyurethane insulation pipes have been developing rapidly as an excellent thermal insulation material. It is widely used in various pipelines such as heating, refrigeration, oil transportation, and steam transportation. It is widely used in various pipelines such as heating, refrigeration, oil transportation, and steam transportation.
The polyurethane foam of the insulation layer is applied outside the anti-corrosion layer of the steel pipe by on-site pouring or prefabricated molding. The method is simple and the work efficiency is convenient