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Polyurethane direct-buried insulation pipes are widely used in the insulation industry due to their excellent thermal and anti-corrosion properties. These pipes play a vital role in energy conservation and have a long service life, making them a popular choice for various applications. The key component of these pipes is polyurethane, which provides superior insulation 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 laid as the base to ensure stability.
2. Before pouring the C15 plain concrete, the soil at the bottom of the trench must be compacted. The surface of the concrete layer should be smooth and even. In cases where the soil is collapsible, it should be replaced with about 1 meter of non-collapsible material and then compacted.
3. At the joints within the trench, the width and depth should be increased by 250–300 mm compared to non-joint sections to allow for proper installation and expansion.
4. The position of the corrugated compensator should be determined based on its actual size. The soil level beneath the compensator must be adjusted accordingly to ensure proper alignment.
5. The slope of the upper soil layer along the pipeline should match the slope of the pipeline itself to prevent water accumulation and ensure proper drainage.
6. A 100 mm layer of fine sand (with a maximum particle size of 8 mm) should be placed around the directly buried pipe. This sand must not contain clay, bricks, stones, or metal debris to avoid damage to the pipe.
7. If the pipeline is installed in an area with highly corrosive materials or debris, the backfill should be replaced with less corrosive soil and compacted in layers.
8. The trench must be properly drained. A drain system can be installed, and a water pump can be used to remove any accumulated water from the collecting basin.
Before installation, the following precautions should be taken:
1. Inspect the anti-corrosion layer on the surface of the pipeline before placing it in the trench. Any damage should be repaired immediately to prevent corrosion.
2. Ensure that the pipeline's axis and slope match the design specifications during installation.
3. Prefabricated insulation pipes can be installed in a single trench or lifted into place after welding multiple sections. For longer welded sections, two or more cranes should be used to lift the pipe, ensuring balance and safety. Never push the pipe directly into the trench.
4. After the working steel pipe is welded and inspected, the joint insulation and outer casing connection should be completed. Use vertical molds for polyurethane foaming and apply heat shrinkable tape to seal the joints. The overlap should be at least 100 mm. The outer casing can be butt-welded first, and the hole should be filled with foam after a successful seal inspection.
5. At the end of each workday, cover the pipe ends with blind plates to prevent dirt and water from entering the pipeline.
6. There are three main installation methods: cold installation, hot prestressed installation, and one-time compensator installation.
7. Cold installation involves connecting the pipe sections directly and backfilling after passing inspection.
8. Hot prestressed installation requires welding the pipe to 60% of the operating temperature before backfilling.
9. One-time compensator installation involves welding the pipe when it reaches 60% of the operating temperature, followed by backfilling and compaction.
For more information, contact Dacheng Xiangdong Insulation Refractory Material Factory at 13473696600 or 15731614448.
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