If you're in the north, where you can get cozy warmth on a cold winter day, you might not see the countless polyurethane pipes buried in the ground that make central heating possible. If you are in the south, you may not enjoy the benefits of central heating, and thermal insulation pipes are still closely related to our lives. Central heating and refrigeration, oil and natural gas, industrial pipelines, and low-temperature transportation are all inseparable from pipeline insulation technology. Polyurethane is the preferred material for thermal insulation pipelines. The application ratio in Europe and the United States and other countries accounts for half of the country, but it is still in its infancy in my country. There is still a lot of room for the development of polyurethane insulation pipes in China, and it also carries our infinite expectations...

The first layer: working steel pipe layer

According to the design and customer requirements, seamless steel pipes, spiral steel pipes and straight seam steel pipes are generally selected. After the surface of the steel pipe is treated by the advanced shot blasting and rust removal process, the rust removal grade of the steel pipe can reach Sa2 level in the GB8923-1988 standard, and the surface roughness can reach R=12.5 microns in the GB6060.5-88 standard.

Second layer: polyurethane insulation layer

It is formed by injecting rigid polyurethane foam stock solution at one time into the cavity formed between the steel pipe and the outer sheath with a high-pressure foaming machine, which is commonly known as "tube-in-tube foaming".

The third layer: high-density polyethylene protective layer

Prefabricated black or yellow polyethylene plastic pipes with a certain wall thickness. Its function is to protect the polyurethane insulation layer from damage by mechanical hard objects, and secondly, it is anti-corrosion and waterproof.

The development history of pipeline insulation technology Humans have used insulation materials for more than a thousand years, and industrial insulation appeared in 1853. In World War I, Germany used asbestos on a large scale as a ship's thermal insulation material, and the United States used calcium silicate at the beginning of World War II.

In 1948, the United States began industrial application production.

In 1962, Japan began to use diatomaceous earth and rock wool as thermal insulation materials. Subsequently, new thermal insulation materials such as foam glass and foam plastics have come out one after another, and mineral fiber products have undergone new improvements and developments.

In 1973, after the world energy crisis, thermal insulation materials further developed in the direction of series, porous, and particle reflection, and new trends emerged. For example, the United States, Britain, Germany, Japan and other countries have published patents on foamed asphalt insulation materials, the Soviet Union has developed cellular porous silicon, and the United States, Britain, France and other countries have studied and applied asphalt, tar and natural petroleum hydrocarbon prepolymers.

Polyurethane for pipe insulation Rising global energy demand requires substantial investment in building an environmentally friendly supply infrastructure. Since the birth of polyurethane synthetic materials, it has gradually been used in the field of pipeline insulation, and the scope of application has become more and more extensive.

Since the birth of polyurethane composite material in the 1930s, polyurethane rigid foam insulation pipe has been developed as an excellent thermal insulation material, and its application range is becoming more and more extensive. Remarkably and widely used in various heating, cooling, oil, gas and other pipelines. Especially in the central heating system, the polyurethane foam insulation pipe shows its talents and is the favored choice for many projects. Likewise, in a wide variety of industries, polyurethane is the material of choice for pipes and tanks.

The advantages of polyurethane insulation pipe

1. The thermal conductivity base of polyurethane foam can reduce heat exchange to a certain extent by relying on a thin and light thermal insulation layer.

2. Through formula adjustment, it can work in a wide temperature range.

3. Excellent mechanical properties are guaranteed even with low density.

4. Polyurethane insulation parts can be produced in the factory or foamed on the spot.

5. Compatible with many materials, providing excellent adhesion and long-lasting dimensional stability.

6. The amount of water vapor intrusion is small, so that the pipeline maintains excellent thermal insulation performance for a long time.

Since the application of polyurethane thermal insulation material, polyurethane thermal insulation pipes have been used in various indoor and outdoor pipes in our country. We know that polyurethane insulation pipes are mainly working steel pipes, insulation layers, protective shells, leakage alarm lines, etc.

In fact, the most important role of the polyurethane thermal insulation pipe is thermal insulation, and the ability to play a role in thermal insulation is the most critical. The thermal insulation layer is tightly bonded to the outer skin of the steel pipe, which isolates the infiltration of air and water, and can play a good anti-corrosion effect. At the same time, its foam cells are closed, and the water absorption is very small. High-density polyethylene shell and FRP shell have good anti-corrosion, insulation and mechanical properties. Therefore, the outer skin of the working steel pipe is difficult to be eroded by the outside air and water.

In addition, the polyurethane thermal insulation pipe of Yanshan Jintai Pipe Fittings Manufacturing Co., Ltd. is a direct buried prefabricated thermal insulation pipe with good thermal insulation performance, safety and reliability, and low engineering cost. It effectively solves the problems of heat preservation, sliding lubrication and waterproofing of exposed pipe ends of prefabricated directly buried thermal insulation pipes for high temperature heat transfer at 130℃-600℃ in urban central heating. The high-temperature prefabricated direct-buried thermal insulation pipe not only has advanced technology and practical performance that traditional trenches and overhead laying pipes are incomparable to, but also has significant social and economic benefits, and is also a powerful measure for heating and energy saving. The high-temperature prefabricated direct-buried thermal insulation pipe adopts direct-buried heating pipeline technology, which marks that the development of China's heating pipeline technology has entered a new starting point.

The development of the polyurethane thermal insulation pipe industry has made it not only has the effect of thermal insulation, but also has many other advantages. Therefore, the polyurethane thermal insulation pipe will be well received by everyone.