Performance characteristics of polyethylene polyurethane insulation pipe

The GRP directly buried insulation pipe is closely combined with the steel pipe conveying the medium, the polyurethane rigid foam plastic insulation layer and the glass fiber reinforced plastic outer protective layer (GRP). Has good mechanical strength and excellent corrosion resistance.
Layer: Working steel pipe layer, seamless pipes are selected according to the design and customer requirements(GB8163)Spiral welded pipe（GB9711; SY/T5038）Straight seam welded pipe(GB3092)After the surface of the steel pipe is treated with shot blasting and rust removal technology, the rust removal grade of the steel pipe can reachGB8923-In the standardSa2Grade, surface roughness can reachGB6060.5in the standardR=12.5Microns. After removing dirt and rust from the surface of the steel pipe, a layer of cyanide coagulation anti-corrosion material is applied, which serves the purpose of waterproofing and improving the bonding surface between the insulation layer and the steel pipe, forming a whole.
The second layer: polyurethane insulation layer, which is made by injecting the original liquid of rigid polyurethane foam into the cavity formed between the steel pipe and the special steel mold with a high-pressure foaming machine. It is commonly known as the "mold foaming process". If the polyurethane foam is full, any quality problem is convenient for direct inspection. Its function is waterproofing, but insulation, and the third is to support the self weight of the heating network. When the temperature of the conveying medium is:-50℃—120At ℃, rigid polyurethane foam is selected as the insulation layer; When the temperature of the conveying medium is:-50℃—150At ℃, rigid polyurethane foam is selected as the insulation layer.
The third layer: The fiberglass protective layer is made by mechanical wet winding. Its function is to protect the polyurethane insulation layer from mechanical hard object damage, and secondly, it is anti-corrosion and waterproof. It has good weather resistance, acid resistance, and seawater resistance, but the resin must be used306#、191#、189#、196#Rigid and semi-rigid unsaturated resins. Glass fiber and cloth must be made of medium low alkali fiber yarn drawn by platinum crucible or tank furnace to ensure product quality.
Product Features:
1Has good physical properties and higher strength than steel, cast iron, and plastic. The expansion coefficient of fiberglass reinforced plastic is roughly equivalent to that of steel, but its thermal conductivity coefficient is only the same as that of steel0.5%It is a good insulator for heat and electricity .
2Good corrosion resistance, long service life, up to30Years or more.
3Low thermal conductivity, for0.028W/mKExcellent insulation performance, with a water temperature drop of less than0.5℃/km.
Application fields:
Price of fiberglass insulation pipe heating/When the temperature of the conveying medium is:-50℃—150The insulation and cooling engineering of various media within the temperature range of ℃ is widely used in urban collective heating, geothermal development, coal mines, petroleum, ports, chemical industry, etc
The insulation and cooling engineering of the industry, due to its good weather resistance compared to high-density polyethylene, is particularly suitable for pipeline networks that alternate between direct burial and overhead laying, as well as heating networks laid in coastal areas.
Mainly used in fields such as water conservancy, sewage, petroleum, chemical, electric power, metallurgy, and medicine, it has the advantages of light weight, high mechanical strength, strong corrosion resistance, and easy installation and maintenance.

Product Description:
In piping systems, elbows are fittings that change the direction of the pipeline. According to the angle, there are three commonly used types, and according to engineering needs, there are also other abnormal angle elbows. The materials for elbows include cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, non-ferrous metals, and plastics. The methods of connecting with pipes include: direct welding, commonly used flange connection, hot melt connection, electric melt connection, threaded connection, and socket connection. According to the production process, it can be divided into welded elbows, stamped elbows, cast elbows, etc. Other names: Degree Bend, Right Angle Bend, Love Bend, etc.
（1）Polyurethane insulated steel pipe working steel pipe: according to the technical requirements of the conveying medium, seamless steel pipe, double-sided submerged arc spiral welded steel pipe are used respectively. 　　
（2）Polyurethane insulated steel pipe insulation layer: rigid polyurethane foam plastic is used. 　　
（3）Polyurethane insulated steel pipe protective shell: made of high-density polyethylene or fiberglass. 　　
（4）Polyurethane insulated steel pipe leakage alarm line: When manufacturing high-temperature prefabricated buried insulation pipes, an alarm line is buried in the insulation layer near the steel pipe. Once a leakage occurs in a certain part of the pipeline, the transmission of the alarm line can trigger an alarm on the detection instrument and display the accurate location and degree of the leakage, so as to notify maintenance personnel to quickly deal with the leaking pipe section and ensure the safe operation of the heating network.