Polyurethane insulation steel pipe Introduction:
High-density polyethylene plastic outer protection polyurethane foam prefabricated buried insulation pipe, referred to as polyurethane insulation steel pipe, is the transmission medium of the working steel pipe, polyurethane insulation layer and polyethylene plastic outer protection pipe in turn to the outside of the combination of a kind of heat preservation pipe material.
Polyurethane heat preservation steel pipe structure:
1, The outer steel pipe: to protect the insulation layer from groundwater erosion, support the working pipe and can withstand a certain degree of external load, to ensure that the working pipe normal work.
2、Anti-corrosion layer: to protect the outer steel pipe to avoid corrosion of corrosive substances corrode steel pipe, extend the service life of the steel pipe.
3、Damping layer: Ensure the free movement of the working steel pipe for thermal expansion and contraction.
4、Polyurethane foam layer: to ensure the medium temperature, to ensure that the surface of the outer tube to maintain room temperature.
5、Blocking, reflective layer: to ensure that the organic foam material does not enter the inorganic rigid high-temperature layer; reflective high-temperature layer part of the heat.
6、Working steel pipe: to ensure the normal flow of conveying medium.
7, Inorganic rigid insulation layer: high temperature resistance, to ensure that the interface temperature between the organic insulation layer, to ensure that the foam is not carbonized.
Polyurethane insulation steel pipe standards in various countries:
1, China: GB/T 29047-2021 “high density polyethylene outer sheath rigid polyurethane foam prefabricated direct burial insulation pipe and pipe fittings”
2, Europe: EN 448:2015 “District heating pipes . Pre-insulated, bonded pipes for direct buried hot water networks“
3. Russia: GOST 30732-2020 ”Steel pipes and molded products with foamed polyurethane insulation in the protective jacket”.
Features of polyurethane insulation steel pipe:
1, High efficiency thermal insulation: low thermal conductivity of polyurethane foam insulation layer, excellent thermal insulation performance.
2, Waterproof and anticorrosion: high-density polyethylene outer protection layer is waterproof, moisture-proof and corrosion-resistant.
3, High strength: polyurethane and steel pipe closely combined, high compressive strength.
4、Convenient construction: direct burial method, simple installation, short construction period.
5, Long service life: under normal use conditions, the service life can reach more than 30 years.
6、Environmental protection: the material is pollution-free and friendly to the environment.
7、Wide application: applicable to heating, water supply, chemical industry and other fields.
8, Good low-temperature performance: in a low-temperature environment can still maintain good performance.
9, Low maintenance costs: insulation layer to protect the pipeline, reduce corrosion, reduce maintenance needs.
10, High reliability: can be equipped with a leakage detection system to ensure operational safety.
Application areas of polyurethane insulation steel pipe:
1, City heating system: used for centralized heating pipeline, to ensure efficient transmission of heat energy and reduce heat loss.
2、Oil and natural gas transportation: used for long-distance oil and gas transportation pipelines, insulation and anti-freezing, to ensure the stable transmission of energy.
3、Chemical industry: used for transportation of chemicals and organic substances, to prevent the medium from being contaminated.
4、Food and pharmaceutical industry: used for conveying liquids and gases, keep the medium temperature stable, to ensure food safety and drug quality.
5、HVAC system: used for cooling water and hot water transportation, improve system energy efficiency.
6、Industrial fluid transportation: used for liquid and gas transportation in industrial production, reduce heat loss.
7、Low temperature transportation field: used in liquefied natural gas (LNG) pipeline to maintain low temperature.
8、Construction field: used for building exterior wall insulation, cold storage and pipeline insulation.
9、Water conservancy and mining: Used in pipeline systems for cold and frost protection, heat preservation and anti-corrosion.
10、Geothermal and hot spring transportation: used for long-distance transportation of geothermal or hot springs to meet cooling or insulation needs.
Polyurethane insulation steel pipe performance parameter table:
| Parameter Name | Unit | Parameter Value | Description |
|---|---|---|---|
| Thermal Conductivity | W/(m·K) | ≤0.024 | The low thermal conductivity of polyurethane foam insulation ensures excellent thermal insulation performance. |
| Water Absorption Rate | % | ≤0.2 | The low water absorption rate of polyurethane foam ensures good waterproof performance. |
| Compressive Strength | MPa | ≥0.3 | Polyurethane foam has a high compressive strength. |
| Closed Cell Rate | % | ≥95 | The high closed cell rate of polyurethane foam ensures excellent thermal insulation and waterproof performance. |
| Density | kg/m³ | 30-80 | The density range of polyurethane foam. |
| Temperature Range | ℃ | -196~150 | Polyurethane insulation can withstand extremely low and relatively high temperatures. |
| Service Life | Years | 30-50 | The long service life of polyurethane insulated steel pipes under normal operating conditions. |
| Corrosion Resistance | - | Good | The outer jacket and corrosion-resistant layer effectively prevent the corrosion of steel pipes. |
| Outer Jacket Density | kg/m³ | 940-960 | The density of high-density polyethylene outer jacket. |
| Outer Jacket Tensile Strength | MPa | ≥19 | The tensile strength of the outer jacket. |
| Outer Jacket Elongation at Break | % | ≥450 | The elongation at break of the outer jacket. |
Polyurethane insulation steel pipe quality inspection report:
| Inspection Item | Inspection Content | Inspection Standard | Notes |
|---|---|---|---|
| Appearance Quality | Smooth and flat surface, free from bubbles, cracks, dents, and impurities | Visual Inspection | Surface quality directly affects the service life of the pipe. |
| Dimensional Accuracy | Outer diameter of steel pipe, wall thickness, insulation layer thickness, outer diameter and wall thickness of outer jacket | GB/T 29047-2012 | Dimensional deviations must be controlled within the standard range. |
| Insulation Layer Performance |
Density ≥60 kg/m³ Closed cell rate ≥88% Thermal conductivity ≤0.033 W/(m·K) Water absorption rate ≤10% (100℃ boiling water, 90 minutes) Compressive strength ≥0.3 MPa (at 10% deformation) |
GB/T 29047-2012 | Insulation performance is a core indicator. |
| Outer Jacket Performance |
Density ≥950 kg/m³ Tensile strength ≥19 MPa Elongation at break ≥350% Longitudinal shrinkage rate ≤3% |
GB/T 13018-91 | The outer jacket must have good mechanical properties. |
| Corrosion Resistance | Thickness, adhesion, and corrosion resistance of the anti-corrosion layer | GB/T 8923.1 | The anti-corrosion layer protects the steel pipe from corrosion. |
| Temperature Resistance |
Continuous operating temperature ≤120℃ Peak operating temperature ≤140℃ |
GB/T 29047-2012 | Suitable for a variety of temperature scenarios. |
| Mechanical Strength | Shear strength ≥0.12 MPa (at 23±2℃) | GB/T 29047-2012 | Ensures the pipe is not damaged during construction and operation. |
| Durability | Service life ≥30 years | GB/T 29047-2012 | Long-term stable performance. |
| Non-destructive Testing | Radiographic testing, ultrasonic testing | NB/T 47013.2-2015 | Ensures the internal quality of the pipe. |
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