无码无套少妇毛多18pxxxx,日韩欧美一区二区福利视频,17c视频在线观看,中文字幕久久久久久妻,日本黄色精品专区网站

Polyurethane insulation pipe is an efficient insulation material widely used in pipeline engineering such as heating and cooling. Its core advantages lie in excellent insulation performance, durability, and construction convenience. The following are its main characteristics and application analysis:

1、 Core advantages

Ultra low heat loss

The polyurethane insulation layer adopts closed cell foam structure, with the thermal conductivity as low as 0.022-0.028W/(m · K), and the heat loss rate can be controlled within 5%, which is significantly better than traditional materials (such as rock wool with the thermal conductivity of 0.035-0.045W/(m · K)). For example, using polyurethane insulated pipe supports for 200 ℃ steam pipelines can reduce heat loss by more than 60%.

Long lifespan and stability

The three-layer structure (steel pipe+polyurethane insulation layer+HDPE outer protective pipe) can resist corrosion and moisture, with a service life of over 30 years, far exceeding the 10 years of traditional insulation pipes. Its water absorption rate is ≤ 3%, and it can still maintain stable performance in humid environments.

Construction convenience

Prefabricated design reduces on-site processing and can be directly laid, especially suitable for large-scale projects such as the renovation of the heating pipeline network in Liaoyuan City.

2、 Economy and application scenarios

Cost effectiveness: Although the initial cost is higher than that of rock wool (about 50-100 yuan/meter for polyurethane pipes and 30-60 yuan/meter for rock wool), the long-term energy-saving benefits are significant.

Applicable scenarios: including municipal heating, buried pipelines, high-temperature steam transportation, etc., especially suitable for long-distance thermal engineering.

3、 Comparison with traditional materials

Characteristics: Traditional materials for polyurethane insulation pipes (rock wool/glass wool)

Thermal conductivity 0.022-0.028W/(m · K) 0.035-0.045W/(m · K)

Compressive strength 150-300kPa 40-100kPa

Service life of over 30 years, 10-15 years

Low construction complexity (prefabricated installation) and high (on-site wrapping required)

4、 Market supply

Hebei, Shandong and other regions are the main production areas. Manufacturers such as Langfang Xinda and Cangzhou Puxin provide diversified products with a price range of 5.38-460 yuan/meter, depending on specifications and thickness. For example, the 1688 platform shows PERT insulation pipes as low as 7.4 yuan/meter, while high-density polyurethane tile shells can reach 460 yuan/cubic meter.

5、 Precautions

Temperature limit: Conventional polyurethane can withstand temperatures up to 120 ℃, while modified polyurethane can withstand temperatures up to 180 ℃; Steel sleeve steel structure should be selected for ultra-high temperature environments.

Environmental friendliness: Polyurethane production meets environmental standards, but attention should be paid to the addition of flame retardants.

For specific product parameters or procurement channels, please refer to the 1688 Polyurethane Insulation Pipe Special Zone or government bidding information such as the Liaoyuan Heating Renovation Project.