The steel-sheathed steam insulation pipe is composed of a steel pipe for the conveying medium, a rigid polyurethane foam insulation layer, and a high-density polyethylene outer jacket, all tightly integrated together. This product is primarily used in urban centralized heating networks, oil pipelines, water pipelines in extremely cold regions, and industrial pipeline projects within factory premises. It boasts excellent thermal insulation performance, waterproof and anticorrosive properties, and ease of installation. Moreover, it is resistant to damage from plant roots. Installation does not require trenching; the pipe can be directly buried within a frozen soil layer ranging from 0.6 to 1.2 meters deep. Compared to conventional methods, heat loss is reduced by up to 40%, and its service life is more than 3 to 5 times longer than that of other thermal insulation and anticorrosive materials, with a projected lifespan of 30 to 50 years.

　　Performance indicators for steel-sheathed steam insulation pipes: The directly buried insulation pipe boasts excellent overall performance. It strictly adheres to the process of shot-blasting and derusting the outer surface of the steel pipe and corona treatment of the inner surface of the outer protective casing, further enhancing the bonding performance of the insulation pipe. The insulation layer material has a density of 60 kg/m³. ³ Up to 80 kg/m ³ The rigid polyurethane foam completely fills the gap between the steel pipe and the casing, and possesses a certain degree of adhesive strength, thereby forming a robust, integral structure among the steel pipe, the outer casing, and the insulation layer.

　　Polyurethane foam boasts excellent mechanical and thermal insulation properties. Under normal conditions, it can withstand temperatures up to 120℃; through modification or combination with other insulating materials, its temperature resistance can be extended to 180℃.

　　Steel-sheathed thermal insulation pipes have a wide variety of application features. However, among these many types, in what specific areas does the steel-sheathed thermal insulation pipe excel? Currently, the mainstream varieties of steel-sheathed thermal insulation pipes are widely favored by most users. But why is this the case? First and foremost, the quality of steel-sheathed thermal insulation pipes themselves is remarkably stable. While other types of steel-sheathed thermal insulation pipes may be very convenient to use when first installed, over time they tend to develop quality issues relatively quickly.

　　For example, pipelines made from plastic materials can effectively prevent rust. However, if such pipelines are constantly exposed to sunlight, they themselves will become extremely brittle. Steel-jacketed thermal insulation pipes are used very frequently in many industries. It’s fair to say that steel-jacketed thermal insulation pipes are closely intertwined with our daily lives. If I pay a bit more attention, I’ll notice that the steel-jacketed thermal insulation pipes we’re using today are moving toward a trend of material convergence—this is precisely what steel-jacketed thermal insulation pipes represent.

　　The reason why the sizing machine plays such an important role in the production of steel-on-steel insulated pipes lies in its working principle. The service life of the sizing roller box is largely determined by the service life of the bearings housed within it, and the lifespan of these bearings, in turn, is closely related to the design of the sizing roller box itself, as well as to the manufacturing and installation processes of the steel-on-steel insulated pipe. Specifically, round steel bars of various specifications are formed using roller or tandem roller systems into seamless pipe billets, which then pass through a sizing machine to precisely determine the inner bore and outer diameter of the seamless steel pipe.

　　The basic type No. 20 steel-jacketed thermal insulation pipe production equipment features a relatively small number of sizing machine stands—typically ranging from 3 to 12 stands. Sizing machines are further divided into longitudinal rolling sizing machines and skew rolling sizing machines. Skew rolling sizing machines are generally incorporated into three-roll skew rolling pipe mills. Steel-jacketed thermal insulation pipes boast such promising market prospects precisely because they possess unique advantages that set them apart. Steel-jacketed thermal insulation pipes made from other materials, to varying degrees, all have certain drawbacks in one aspect or another.

　　Steel-jacketed thermal insulation pipes have countless applications. They’re incredibly easy to install—simply bury them underground—and are resistant to corrosion as well as various environmental factors. They’re also extremely durable, which is why these pipes are widely used in construction.