Thermal Insulation Requirements for Polyurethane Insulated Pipes
Product Execution Standards
GB/29047-2012 "High-Density Polyethylene External Sheath for Reinforced Polyurethane Foam Preformed Pipe"
"B埋保温管道及配件"
Specific requirements for polyurethane thermal insulation:
Foam Technology Requirements:
Density: 60 kg/m³
Thermal Conductivity: ≤0.033 (W/m·K) at 50℃
Pore Rate %: ≥88
Radial Compression Strength: ≥0.3 MPa
Insulation pipeline outer diameter:
φ400mm (φ108mm pipe)
φ350mm (φ89mm pipe)
φ330mm (φ76mm pipe)
φ300mm (φ57mm pipe)
φ280mm (φ45mm pipe)
φ250mm (φ38mm pipe)
φ220mm (φ32mm pipe).
Section 3: Polyurethane Foam Insulation Method
(1) Low-temperature adhesive coating
After the surface treatment of the steel pipes is completed, apply low-temperature adhesive to all the low-temperature pipelines of the system for bonding.
The packaging is less than 2mm thick and can be hand-painted once.
Surface Pre-treatment of Steel Pipes
Firstly, use detergent to remove oils and dirt from the surface of the steel pipes.
After the steel pipe surface is completely dry, thoroughly remove the dust from the surface of the steel pipe.
2. For export air compressors, after using asbestos tape for thermal insulation isolation, further polyurethane...
Ester Insulation.
Section 3: One-Step Molding Process
As per design specifications, after the lines are set, install and secure the processed template.
After proportionally mixing the polyurethane, pour it into the pipeline.
After 30 to 40 minutes, remove the mold, ensuring the rubber mold maintains the degree of molding and compactness after demolding.
No Chinese content provided.
After the insulation material has been allowed to settle for 24 hours, cover the surface with a 0.6mm aluminum sheet.
(4) Important Notes
Due to the concealed nature of the application process for polyurethane rigid foam insulation, its technology and quality requirements are crucial.
Quantity and safety should adhere to the principles of perfecting methods and strengthening acceptance.
2. Pouring operations shall comply with the following regulations:
1) Template specifications are matched, with flat board surfaces; templates are easy to install and disassemble, with removable templates being especially easy to dismantle.
The demoldable template does not adhere to the cast polyurethane rigid foam.
2) Ensure the template is stable and secure after installation.
3) When casting polyurethane rigid foam on-site, the ambient temperature should be between 15°C and 25°C, avoiding direct sunlight and high temperatures.
No work is permitted below.
During casting operations, wind speeds should not exceed 4 levels, and when the operation height is greater than 15 meters, wind speeds should not exceed...
Wind speed should be greater than 3 levels; relative humidity should be less than 80%; no construction allowed during rain.
3. Polyurethane rigid foam raw materials and ratios should be suitable for casting applications; after casting applications, polyurethane
The foaming action exerted on the mold should be as minimal as possible; in order to resist the pressure during the casting process,
Polyurethane foam can exert significant胀胀 forces on molds, which can be mitigated by installing them outside the mold.
Reinforced for precise outer dimensions post-molding.
4. Demolding should be done 30 to 40 minutes after casting. The polyurethane rigid foam insulation layer after casting should
After a full 24-hour rest period, proceed with the next stage of construction.
Four: Important Notes
1. Before using the outer scaffolding, check for gaps in the scaffold boards, protruding boards, guardrails, and barriers.
Footprint, confirmed as qualified, may be used.
2. During the operation, there was a situation where the connection between the scaffolding and the building was not approved by the leader.
No disassembly allowed. Disassembly is permitted only after reinforcement measures are taken by the scaffolder, as necessary.
Tools and materials on scaffolding should be evenly distributed and securely placed, not exceeding the allowable load.
4. Strictly prohibit operation by stepping over the guardrails of scaffolding or the balustrades of balconies.
5. When using handheld electrical tools, a leakage protection device must be installed, and a machine test should be conducted before operation.
Always wear insulating gloves when working.
V. Quality Control
Fire prevention measures should be emphasized in the storage areas for polyurethane and during construction operations, with fire extinguishers equipped on-site.
Equipment, no open flame within a radius of 20 meters.
In the event of Category 6 or stronger winds and heavy rain, outdoor high-altitude work should be halted.
3. Pipeline insulation projects should only be carried out after the quality inspection of the pipeline has been approved.
4. The mixing ratio and raw material measurement of polyurethane must comply with relevant specifications and the manufacturer's guidelines.
Home requirements
5. Polyurethane should be mixed manually; any mixture beyond the setting time is not to be used.
6. Prior to pipe insulation installation, anti-corrosion treatment should be conducted according to design specifications.
7. Insulation materials for pipelines should be selected according to design specifications, and must come with inspection reports and factory certification.
