Insulation pipes are generally divided into four categories based on the insulation material and process.
One, the polyethylene-foamed polyurethane polyethylene insulated steel pipe, which is composed of three parts: a polyethylene outer sheath, a polyurethane insulation layer, and a working steel pipe. It is mainly used for underground heating networks in northern cities, underground cooling networks in southern cities, underground insulation pipes for hot springs, and underground insulation pipelines for oil. The rigid polyurethane foam insulation layer allows it to remain unaffected by external forces and not deform or bend under the cover of sand, soil, and mud. The high-density polyethylene outer sheath, with its moisture-resistant and corrosion-resistant properties, protects the insulation layer and extends the service life of the insulated pipeline.
The glass fiber reinforced plastic (GRP) insulated pipeline is composed of a working steel pipe, a pre-fabricated polyurethane insulated casing, and a glass fiber outer sheath. The working steel pipe and the polyurethane insulation layer serve the same functions as described previously. The glass fiber outer sheath is typically made up of three layers of oil and two layers of fabric, utilizing a winding and brushing manual process. In addition to being moisture-resistant and corrosion-resistant, GRP also offers excellent antioxidant properties, making its applications widespread. It can be buried underground or suspended, used for transporting water media at temperatures ranging from 0 to 150 degrees Celsius.
The galvanized steel pipe架空insulation pipeline is composed of three parts: the working steel pipe, the polyurethane insulation layer, and the galvanized steel spiral pipe. The working steel pipe and the polyurethane insulation layer are as described above. The galvanized steel pipe is assembled by connecting iron strips through pressure clips, offering a quick production process and cost savings, especially for larger sizes. The aesthetic and antioxidant properties of the galvanized steel make it effective for overhead pipeline applications.
Four, Steel-clad steel steam insulation pipes, which transport steam as the medium, can withstand high temperatures up to 1,000 degrees Celsius. Insulation materials such as rock wool, ultra-fine glass wool, silica-alumina (calcium), needle felt, and aerogel are selected based on the temperature of the steam being transported. The main working steel pipe and the outer protective steel pipe adopt different internal and external anti-corrosion treatments as needed, with sliding supports for the insulation layer's air layer.
