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Polyurethane direct-buried insulation pipes are widely used in the insulation industry due to their excellent performance, including strong anti-corrosion properties and long service life. These pipes play a significant role in energy conservation and have become a preferred choice for many applications. The key component is polyurethane, which ensures high efficiency and durability.
Here are the installation steps for polyurethane direct-buried insulation pipes:
1. If the bearing capacity of the soil at the bottom of the trench is less than or equal to 60 KPa, a concrete layer should be placed at the base of the trench.
2. Before pouring concrete, the soil at the bottom of the C15 plain concrete layer must be compacted. The surface of the concrete should be smooth and even. If the soil is collapsible, it should be replaced with about 1 meter depth and then compacted.
3. At the joints in the trench, the width and depth should be increased by 250–300 mm compared to non-joint sections.
4. The position of the corrugated compensator must be determined based on the actual size of the compensator. The soil level at the bottom of the compensator should be adjusted accordingly.
5. The slope of the upper soil layer along the pipeline should match the pipeline's slope.
6. A 100 mm thick layer of fine sand should be placed around the directly buried pipe. The sand particles should not exceed 8 mm in diameter, and the sand should not contain clay, bricks, stones, or metal debris.
7. If the soil contains corrosive materials, the backfill should be replaced with less corrosive soil and compacted in layers.
8. The trench must be properly drained. Water can be collected in a sump and pumped out as needed.
Installation of the pipeline should only begin after the trench excavation and the base soil have been inspected and approved. Here are some important considerations during installation:
1. Before placing the pipeline in the trench, the anti-corrosion coating on the surface should be carefully checked. Any damage should be repaired immediately.
2. When connecting the pipeline, ensure that the axis and slope match the design specifications.
3. Prefabricated insulation pipes can be installed in a single trench or lifted into place after welding two or more sections. For longer welded sections, it is recommended to use two or more cranes to lift the pipe. The lifting points should be chosen based on balance conditions. Never push the pipe directly into the trench.
4. After the working steel pipe is welded and passes inspection, the joint insulation and outer casing connection can be completed. Polyurethane foaming can be done using a vertical mold, followed by sealing with heat shrinkable tape. The overlap should be at least 100 mm. The outer casing can be butt-welded first, and then foamed after passing the seal test.
5. At the end of each workday, the pipe ends should be sealed with a blind flange to prevent dirt and water from entering.
6. There are three common installation methods: cold installation, hot prestressed installation, and one-time compensator installation.
7. Cold installation involves directly connecting the pipe sections and backfilling them once the installation is complete and approved.
8. Hot prestressed installation requires welding the pipe to 60% of its working temperature before backfilling.
9. For one-time compensator installation, the pipe must be heated to 60% of its working temperature before welding, then backfilled and compacted.
For more information, contact Dacheng Xiangdong Insulation Refractory Material Factory at 13473696600 or 15731614448.
[Image: Installation steps of polyurethane direct buried insulation pipe]
Source: http://news.chinawj.com.cn
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