The insulation material for directly buried thermal pipelines should have the characteristics of low heat transfer coefficient, low water absorption, high impact toughness, no deformation, no mold, low flammability, no erosion of metal materials, easy construction forming, and low cost. The reasonable configuration of directly buried insulation pipes includes insulation, heat preservation, waterproofing, and anti-corrosion, with a long service life and more environmentally friendly, energy-saving, and efficient use. But in order to better ensure the integrity of its characteristics and fully utilize them, we should also do a good job in connecting and solving the problems when constructing polyurethane material buried insulation pipes.

The selection method of directly buried insulation pipes is crucial for the construction of underground direct burial projects. The previous reinforced concrete method was not used in the direct burial work, and the thermal deformation of the directly buried insulation pipes was also carried out in the outer pipe to reduce costs. This also reduces the construction period and ensures the safety factor of the heating pipeline network, which can be widely used with different temperatures for safer practical effects! The insulation method for directly buried insulation pipe sockets of thermal pipelines is applicable to new projects of high-temperature compressed air pipelines. Polyurethane material can be used in directly buried insulation pipes. In addition to the general compensated laying method, the following three uncompensated laying methods can better demonstrate their advantages.

Thermal insulation method for heating pipeline sockets

1. The overall temperature of the welded pipeline during cold installation is equivalent to the working temperature of backfill soil. The pipeline can be immediately backfilled with soil during construction, as it minimizes or even eliminates the need for pipeline compensators and support frames, thereby saving a lot of assets. Due to the increase in axial stress of the pipeline, it is sometimes necessary to lift the tee or lay it in deeper layers.

2. Heating installation method: Before backfilling, heat the pipeline to the middle temperature, and then carry out backfilling by welding the pipeline. Complete the pre installation to reduce the significant ground stress during operation by half. Heating can be selected based on specific conditions, such as electric heating, steam or boiling water heating, etc.

3. The installation method of disposable pipeline compensator is to heat the pipeline to the middle temperature after backfilling, compensate with disposable pipeline compensator, digest and absorb the estimated thermal expansion deformation, and complete the overall electric welding, reducing the large ground stress during operation by half. Because it prevents long-term open channels, it greatly reduces the trouble caused to transportation and commercial services.

For the insulation method of directly buried insulation pipe sockets for thermal pipelines, the port number is sealed with polyethylene film or three-layer PE cold wrapping tape. Before installation, it is necessary to enter the water for moisture and engineering construction! In addition, double-layer seamless bundling of insulation materials can effectively reduce thermal damage, and friends must also take measures to prevent thermal bridges caused by directly buried insulation pipes on the surface of their outer clothing. Due to the reasonable temperature control of the anti-corrosion layer on everyone's outerwear, it can also be tied with insulation materials, and the double-layer aluminum platinum reflective layer controls the surface of the outerwear to reduce thermal damage!