The insulation jacket's core tube, which serves as the medium for conveying, is typically made of seamless pipes (GB8163-87), spiral-welded pipes (GB9711-88; SY/T5038-92), straight seam welded pipes (GB3092-93), galvanized steel pipes, and PPR.

The Insulated Jacket Pipe boasts the following features compared to other pipeline materials:

The outer protective layer is made of steel pipes, offering high strength.

Steel pipes available: Seamless pipes made of 20# and Q235 steel, spiral steel pipes, and electric-welded steel pipes, with performance indicators meeting national and petrochemical ministry standards.

Seamless steel tubes are manufactured in accordance with GB/T8163-2008 standard.

Spiral steel pipes are manufactured in accordance with SY/T5037-2000 and GB/T9711.1-2011.

Welded steel pipes are manufactured in accordance with GB/T3091-2001.

The Insulating Jacket Pipe, also known as "pipe within a pipe," is constructed using a "two-step" method, consisting of a high-density polyethylene outer protective layer, polyurethane rigid foam pipe, and steel pipe. The insulating layer material is a rigid polyurethane foam with a density of 60 to 80 kg/m3, which completely fills the gap between the steel pipe and the sleeve pipe, and possesses a certain degree of adhesive strength, forming a solid and integrated structure among the steel pipe, outer sleeve, and insulation layer.

The jacket insulation pipe foam boasts excellent mechanical and thermal insulation properties, typically withstanding temperatures up to 120℃. Through modification or combination with other insulating materials, it can endure temperatures as high as 180℃.

Polyurethane buried-insulated pipes offer superior thermal insulation properties, with heat loss only 25% of traditional piping materials. Long-term operation can save a significant amount of energy and reduce energy costs.

2. It boasts strong waterproof and corrosion-resistant capabilities, eliminating the need for additional trenching. It can be directly buried underground or in water, offering simple and quick construction with a low overall cost.

3. High-density polyethylene jacketed thermal pipes exhibit excellent corrosion and impact resistance even under low-temperature conditions, and can be directly buried in frozen soil.

4. High-density polyethylene jacketed insulation pipes have a lifespan of up to 30-50 years, and proper installation and use can reduce maintenance costs for the pipeline network.

Direct-burial Jacketed Insulation Pipe

In accordance with design and customer requirements, seamless pipes (GB8163-87) are typically selected for diameters DN200 and below, while spiral-welded pipes (GB9711-88; SY/T5038-92) and straight seam-welded pipes (GB3092-93) are chosen for diameters above DN200. After undergoing the shot blasting rust removal process, the steel pipes achieve a rust removal level of Sa2 as per GB8923-1988 standards, with a surface roughness of R=12.5 micrometers as per GB6060.5-88 standards.

Insulation Layer:

Our products are applied to the outer surface of steel pipes using methods such as on-site casting or pre-formed shapes, offering simplicity and rapid effectiveness. Polyurethane pre-insulated pipe pricing/Polyurethane pre-insulated pipe manufacturers/Polyurethane pre-insulated pipe's polyurethane insulation is suitable for temperatures ranging from +120℃ to -196°C. The thermal conductivity of polyurethane foam is the lowest among insulation materials, thereby minimizing heat loss of the material to the lowest extent.

Polyethylene Coating Protection

High-Density Polyethylene: Features include high strength, impact resistance, resistance to environmental aging and pre-stress cracking, corrosion resistance, low-temperature resistance, easy welding, simple construction, and strict sealing without leaks.

Product Features of Direct-Burial Jacketed Insulation Pipe:

1. Reduce construction costs.

According to estimates by relevant authorities, dual-pipe heating pipelines can typically reduce construction costs by around 25% (using glass fiber as the protective layer) and 10% (using high-density polyethylene as the protective layer).

Low thermal loss, energy-saving.

Its thermal conductivity coefficient is: λ = 0.013-0.03 kcal/m·h·°C, significantly lower than that of other commonly used pipe insulation materials, with an insulation effect improved by 4-9 times. Additionally, its water absorption rate is very low, approximately 0.2 kg/m2. The low water absorption rate is due to the closed cell rate of the polyurethane foam in the polyurethane pre-insulated pipe being around 92%. The low thermal conductivity and low water absorption, combined with the protective shell of high-density polyethylene or glass fiber with good waterproof performance, alter the traditional trench laying of heating pipelines, which were akin to "wearing a wet quilt." This greatly reduces the overall thermal loss of the heating pipelines, with the heat network loss at 2%, less than the standard requirement of 10%.

3 Excellent corrosion and insulation properties, long service life.

The polyurethane rigid foam insulation layer, tightly bonded to the outer surface of the steel pipe, effectively blocks the penetration of air and water, providing excellent corrosion resistance. Additionally, its foam cells are closed, resulting in minimal water absorption. The high-density polyethylene and glass fiber reinforced plastic shells both offer superior corrosion resistance, insulation, and mechanical properties. Consequently, the outer surface of the working steel pipe is highly resistant to external air and water erosion. As long as the internal water quality of the pipeline is properly managed, as introduced by Dacheng Rongbang Corrosion and Insulation Materials Co., Ltd., the service life can exceed 50 years, which is 3 to 4 times longer than that of traditional trench and overhead installations.

4. Pipeline Insulation: Takes up less space, quick installation, and environmentally friendly.

Direct-burial heating pipe insulation eliminates the need for extensive ground trenches, requiring only the burial of the insulated pipe underground. This significantly reduces the land required for the project, cutting earthwork excavation by over 50% and the amount of masonry and concrete used by 90%. Additionally, polyurethane direct-burial insulated pipes, their manufacturers, and the processing of the insulated pipes, as well as on-site trenching, can be carried out concurrently, necessitating only on-site connections, which can shorten the construction period by over 50%.