Polyurethane insulated steel pipe manufacturer

It is made from a combination of high-performance polyether polyols and multiple methyl polyphenyl polyisocyanates through chemical reactions and foaming

It is made from a combination of high-performance polyether polyols and multiple methyl polyphenyl polyisocyanates through chemical reactions and foaming. Polyurethane insulation pipes are used for insulation and cooling engineering of various indoor and outdoor pipelines, central heating pipelines, air conditioning pipelines, chemical, pharmaceutical and other industrial pipelines. Overview: Polyurethane foam insulation pipe has been rapidly developed as an excellent insulation material since the birth of polyurethane synthetic materials in the 1930s. Its application scope is also becoming more and more extensive. Due to its simple construction, energy saving and anti-corrosion, it is widely used in various pipelines such as heating, cooling, oil transportation, and steam transportation.

Polyurethane insulated steel pipe manufacturer

Polyurethane Insulation Pipe - Common Problems and Solutions in Construction

The slow starting speed of polyurethane insulation pipes usually occurs during autumn, winter or morning construction, due to sudden drops in temperature or low temperatures. Raising the ambient temperature and black material temperature can solve the problem. Generally, raising the temperature of the black material to 30-60 ℃ and the ambient temperature to 20-30 ℃ is sufficient.

The phenomenon of rapid occurrence of polyurethane insulation pipes usually occurs during spring and summer or noon construction, due to sudden temperature rise caused by high temperatures. Black materials can be cooled with cold water or left outdoors for natural cooling at night to avoid direct sunlight.

The strength of polyurethane insulation pipe foam is low and the foam is soft. This phenomenon is caused by the imbalance of the proportion of black and white materials. Properly increase the proportion of black materials (1:1-1.05). Note that the proportion of black materials should not be too large, otherwise the foam will become brittle and affect the foam performance.

Polyurethane insulation pipes have become a relatively mature technology in some developed countries abroad. In the past decade, China's heating engineering technicians have been promoting the development of domestic pipeline laying technology to a higher level by digesting and absorbing this technology. The practical achievements over the past decade have fully demonstrated that the laying method of polyurethane insulated pipelines has many advantages compared to traditional trench and overhead laying. The directly buried thermal insulation pipe is closely combined by the steel pipe conveying the medium, the high-density polyethylene outer sleeve, and the rigid polyurethane foam insulation layer between the steel pipe and the outer sleeve. This is also the intrinsic driving force behind the rapid development of polyurethane insulated buried pipes in China's heating engineering.

The relevant standards for polyurethane insulation pipes shall be in accordance with CJ/T114-2000 High Density Polyethylene Sheath Pipe Polyurethane Foam Plastic Prefabricated Directly Buried Insulation Pipe or EN253 Integral Prefabricated Insulation System for Underground Water Heat Pipe Network, Insulation Pipe Composed of Working Steel Pipe, Polyurethane Insulation Layer and Polyethylene Jacket. Seamless steel pipe shall be in accordance with GB8163 Seamless Steel Pipe for Fluid Transport. Spiral steel pipe shall be in accordance with GB/T 9711.1-1997 Technical Conditions for Delivery of Steel Pipe for Petroleum and Natural Gas Industries. The standard jacket shall be in accordance with GB13018-91 Limit Deviation of Outer Diameter and Wall Thickness of Polyethylene (PE) Pipe. Technical parameters of prefabricated directly buried insulation pipe: axial shear strength: ≥ 0.12MPa (23 ± 2 ℃) Continuous operating temperature: 140 ℃ Max peak operating temperature: 150 ℃ Max Service life: ≥ 30 years (insulation layer and outer protective layer, service life of working steel pipe is related to water quality) Net area length of pipe end: 200mm Pipe diameter range: DN20-DN1200 Working steel pipe Execution standard: Seamless steel pipe is used for pipe diameters of DN150 and below, in accordance with standard GB/T8163-1999. Spiral welded pipes are used for pipe diameters of DN200 and above, in accordance with the standard SY/T5037-2000 or GB/T9711.1. Polyurethane insulation pipe temperature layer technical parameters: average pore size: ≤ 0.5mm, closed cell rate ≥ 88%, density ≥ 60kg/m3 at any position, compressive strength ≥ 0.3MPa (under 10% deformation conditions), water absorption rate: ≤ 10% (boiling water at 100 ℃ for 90 minutes), low-pressure high-density polyethylene outer protective pipe technical parameters: density ≥ 950kg/m3 (20 ℃), carbon black content: 2.5% ± 0.5% (mass percentage), thermal conductivity: 0.43W/(m. ℃), thermal expansion coefficient: 18010-6 (1 ℃), melt polyurethane insulation pipe index: 0.50~0.70g (MFI 190 ℃/5kg), tensile strength: ≥ 19MPa, fracture strength Elongation rate: ≥ 350%, resistance to environmental stress cracking: ≥ 200h longitudinal shrinkage rate.