Precast Direct Buried Insulated Pipe

 

Direct-buried pre-insulated pipes are composed of a steel pipe for transporting the medium (working pipe), rigid polyurethane foam (insulation layer), and a high-density polyethylene outer casing (protective layer), all tightly bonded together. Pre-insulated direct-buried pipes are suitable for pipeline systems where the temperature of the conveyed medium (long-term operating temperature) does not exceed 120°C, and occasional peak temperatures do not exceed 130°C.

Precast Direct Buried Insulated Pipe Specification

Out diameter: 219-1422mm

Wall thickness: 5-35mm

Production capacity: 28,000 Tons per year

Payment Terms: L/C or T/T

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Structure of pre-insulated direct-buried pipes:

First layer: The steel working layer is generally longitudinally spiral welded according to design and customer requirements. After shot blasting treatment, the surface of the steel is advanced to achieve a rust grade of Sa2 level, meeting the standard of up to 88 standard GB6060.5 R=12.5 meters surface roughness.

Second layer: Using a high-pressure foaming machine, rigid polyurethane foam is injected into the cavity between the steel pipe and the outer protective layer in one step, forming a polyurethane insulation layer, commonly known as the "internal foaming process". It provides functions such as waterproofing, insulation, and thermal network self-support. When the temperature of the conveyed medium is between -50°C and 150°C, rigid polyurethane foam is chosen as the insulation layer.

Third layer: A black protective layer with a certain wall thickness is prefabricated from high-density polyethylene to serve as the outer protective layer.

Advantages of pre-insulated direct-buried pipes:

• Excellent insulation performance with low heat loss, leading to significant energy savings and reduced energy costs over long-term operation.
• Strong waterproof sealing, corrosion resistance, low-temperature resistance, and high mechanical strength, meeting the thermal stress requirements for uncompensated direct burial installation.
• Requires less land and allows for quick construction. There is no need to build large pipe trenches; the pipes can be directly buried underground, making construction convenient, fast, and cost-effective.
• Operational lifespan of over 30 years, with proper installation and usage effectively reducing maintenance costs for the pipeline network.

Hot Tags: precast direct buried insulated pipe, China precast direct buried insulated pipe manufacturers, suppliers, referral 3pe pipe, repair 3pe pipe, website 3pe pipe, catalog 3pe pipe, custom 3pe pipe, polyethylene resin 3pe pipe