[Steel knowledge] Polyurethane insulation pipe is safer and more stable
The polyurethane heat-insulating steel pipe has three parts: an outer protective layer, an insulating layer and an anti-leakage layer. The outer protective layer material is a polyethylene jacket pipe or glass steel or other materials. The laying methods include direct burial, overhead, and trenches. From the polyurethane insulation pipe structure can be seen that the role played by the insulation pipe itself is more critical, whether we are in the chemical, petroleum, aerospace or central air conditioning, heating systems, you can see the performance of such insulation pipe played an important performance .
The advantages of polyurethane insulation pipe:
Polyurethane insulation pipe has become a mature technology in some countries. In recent years, our technical staff has also worked hard to develop this technology. Experimental results show that polyurethane insulation pipe is more suitable for laying. Polyurethane insulation pipe has the following advantages: low cost, low consumption, energy saving, good anti-corrosion performance, long service life, less floor space, quick construction and so on. Polyurethane insulation pipe is becoming more and more popular with its excellent performance. Polyurethane insulation pipe anti-corrosion and waterproof features make it particularly suitable for insulation and cooling projects, it has three layers, namely the working steel pipe layer, polyurethane insulation layer, high-density polyethylene protective layer, put on thick clothes, no longer afraid cold.
Polyurethane insulation pipe structure
Polyurethane insulation pipe is divided into three layers from inside to outside:
First floor: Working steel pipe
According to the design and customer requirements generally use seamless steel pipe, spiral steel pipe and straight seam steel pipe. After the surface of the steel pipe is treated with advanced shot blasting technology, the derusting grade of the steel pipe can reach Sa2 grade in GB8923-1988 standard, and the surface roughness can reach R=12.5 micron in the standard of GB6060.5-88.
Second layer: Polyurethane insulation layer:
A high-pressure foaming machine is used to inject the rigid polyurethane foam liquid into the cavity formed between the steel pipe and the outer sheath at one time, which is commonly known as "tube-in-tube foaming".
Third layer: high-density polyethylene protective layer:
Black or yellow polyethylene plastic tubing prefabricated with a certain wall thickness. Its role is to protect polyurethane insulation from mechanical hard objects, and second, anti-corrosion and waterproof.
IV. Leakage alarm line: When manufacturing high-temperature prefabricated direct-buried thermal insulation pipes, an alarm line is buried in the insulation layer near the steel pipe. Once a leak occurs somewhere in the pipeline, it can be conducted on the dedicated detection instrument through the conduction of the alarm line. The alarm shows the exact location of the leak and the extent of the leak, in order to inform the maintenance personnel to quickly handle the leaked pipe section and ensure the safe operation of the heating network. The laying methods include direct burial, overhead, and trenches.
Polyurethane insulation pipe stability and safety
The polyurethane heat-insulating steel pipe is formed by injecting a rigid polyurethane foam liquid at a time into a cavity formed between the outer jackets of the steel pipe by a high-pressure foaming machine. That is commonly known as "tube tube foaming process." One of its functions is waterproof, the other is thermal insulation, and the third is to support the heat network. When the medium temperature is: -50 °C -120 °C, use rigid polyurethane foam insulation layer.
Polyurethane insulation pipe is composed of core pipe (work pipe) rent-reducing layer, heat insulation layer, reflective layer, fastening steel strip, sliding bracket, air layer, outer protection steel pipe, sprayed polyurethane and winding glass steel. With the characteristics of high strength, not easily damaged and able to withstand large upper loads, in order to achieve long life, the outer steel casing needs to be treated with anti-corrosion.
The structural design of polyurethane heat-insulating steel pipe is reasonable, the rolling friction force is small, the force of the fixed bearing is reduced, the mechanics analysis principle is simple, and the stability and safety of the pipe are greatly improved. Solved the problem that every 50-60m of air layer structure exists, a pair of row tide tube must be installed, which greatly reduces the rate of damage to the outer casing and makes the pipeline more beautiful along the line. At the same time, the increased cost of about 50/m due to the setting of the tide tube is reduced.
Editor's summary: The relevant information about polyurethane insulation pipe is introduced here for everyone. I hope this article will be helpful to everyone. If you still have something you don't understand, you can leave a message to Xiaobian at the bottom. We will answer your questions as soon as possible.
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