Price standard for polyethylene jacket prefabricated insulation pipe

Price standard for polyethylene jacket prefabricated insulation pipe

Specification of direct buried insulation pipe DN15~DN1200
Suitable for direct burial of fluid pipelines below 130 ℃ (such as hot springs, hot water, air conditioning water, crude oil, etc.)
Meets CJ/T114-2000 and CJJ/T81-98 standards

Price standard for polyethylene jacket prefabricated insulation pipe

Directly buried laying, easy and fast installation
Detailed specifications of prefabricated buried insulation pipes:

Product Name Core Tube Material Core Tube Diameter (mm) Insulation Layer Thickness (mm) Outer Protective Tube Type
Directly buried insulation pipe, seamless steel pipe, Φ 25- Φ 1220, 30-70 high-density polyethylene jacket pipe, anti-corrosion steel pipe, wrapped fiberglass pipe

Straight seam welded pipe Φ 25- Φ 219

Spiral welded pipe Φ 159- Φ 1220-
Pipe diameter list: Φ25、32、48、57、76、89、108、114、133、159、219、273、325、377、426、478、529、630、720、820、920、1020、1220mm

The structure of directly buried steel insulated pipelines can be divided into two types based on the sliding mode: internal sliding type and external sliding type.
1. Internal sliding type: The insulation structure consists of a working steel pipe, aluminum silicate, drag reduction layer, microporous calcium silicate, insulation layer, stainless steel fastening steel strip, aluminum foil reflective layer, polyurethane insulation layer, outer steel pipe, and external anti-corrosion layer.
2. External sliding type: The insulation structure consists of a working steel pipe, a glass wool insulation layer, an aluminum foil reflective layer, a stainless steel fastening strap, a sliding guide bracket, an air insulation layer, an external protective steel pipe, and an external anti-corrosion layer.
Structural Mechanism of Directly Buried Steel Jacketed Steel Insulated Pipeline
1. Anti corrosion coating: protects the outer steel pipe from corrosive substances, prolongs the service life of the steel pipe.
2. Outer protective steel pipe: protects the insulation layer from groundwater erosion, supports the working pipe and can withstand certain external loads, ensuring the normal operation of the working pipe.
3. Polyurethane foam layer: ensure the medium temperature, and ensure that the surface of the external protection pipe is kept at normal temperature.
4. Barrier and reflective layer: ensure that the organic foam material does not enter the inorganic hard high temperature resistant layer; Reflect some heat from the high-temperature resistant layer.

5. Inorganic hard thermal insulation layer: resistant to high temperature, ensuring the interface temperature between organic thermal insulation layer and foam not to be carbonized.
6. Drag reduction layer: Ensure the free movement of the working steel pipe during thermal expansion and contraction.
7. Working steel pipe: Ensure the normal flow of the conveying medium.

From the perspectives of energy conservation, shortened construction period, and environmental protection, polyurethane insulated buried pipes not only have the technical and practical performance of traditional trench and overhead pipeline laying, but also have significant social and economic benefits. However, a high-quality buried heating pipeline project must also have three conditions: reasonable design, reliable insulation pipeline quality, and careful construction. Due to the late start of direct burial heating technology, the above three conditions still need to be continuously improved. From the perspective of quality issues that arise in engineering practice, special attention should be paid to the following issues in design and construction:
1、 In design and construction, it is essential to truly understand the two types of direct burial methods for heating pipelines: compensated direct burial and uncompensated direct burial. It is important to grasp the working principles, characteristics, and application scenarios of each method in order to make reasonable choices in design and ensure safe, reliable, and economical construction.