Installation steps of polyurethane direct buried insulation pipe?
Installation steps of polyurethane direct buried insulation pipe? Dacheng Xiangdong Insulation Refractory Material Factory 13473696600 15731614448
Polyurethane direct-buried insulation pipe is now widely used in the insulation industry. It is favored by people for its excellent characteristics. It has made outstanding contributions in the field of insulation and energy conservation, and it has superior anti-corrosion performance, and its service life is other. Many times the material, the most important part is polyurethane.
1. When the bearing capacity of the upper layer of the bottom of the local ditch is ≤60KPa, the bottom layer of the trench should be padded with concrete layer.
2. The soil layer at the bottom of the C15 plain concrete layer should be compacted first, then the concrete should be poured, and the surface of the concrete layer should be smooth and flat. When the bottom soil layer is collapsible soil, it should be replaced (about 1.0m deep) and compacted.
3. The width and depth of the trench at the joint in the trench should be increased by 250~300mm compared with the non-joint.
4. The position of the corrugated compensator is provided. The soil level at the bottom of the corrugated compensator should be determined according to the actual arrival size of the compensator.
5. The slope of the upper layer along the pipeline should be consistent with the slope of the pipeline.
6. 100mm around the directly buried pipeline is made of fine sand. The diameter of the sand should be no more than 8mm, and the sand layer should not be mixed with clay, brick, stone, iron and other debris.
7. When the pipeline is disposed in the soil layer with strong corrosive slag and debris, the backfill should be replaced with less corrosive soil and layered and compacted.
8. The trench must be drained, and the drain can be used. The collecting basin is drained by a water pump.
The installation of the pipe installation pipe must be carried out after the pipe trench excavation and the trench bottom soil layer are qualified. Pay attention to the following requirements when installing;
1. Before the pipeline is ditched, the anti-corrosion layer on the surface of the pipeline should be carefully inspected. If the anti-corrosion layer is damaged, it should be treated in time.
2. When the pipeline is docked, the axis and slope of the pipeline design should be guaranteed.
3. The prefabricated insulation pipe can be installed in a single ditch, or it can be hoisted after welding two or more tissues. When the welded pipe section is long, it is advisable to use two or more cranes to lift the lower pipe. The position of the lifting point is selected according to the equilibrium condition. It is strictly forbidden to push the pipe directly into the ditch.
4. After the welding of the working steel pipe is completed and passed the inspection, the work of the joint insulation and the outer casing connection can be processed. The vertical mold can be used for the polyurethane foaming, and then the heat shrinkable tape is used to seal the joint part as a whole. The straight pipe is overlapped by 100mm; the outer casing can be first butt welded, and the hole is foamed after passing the seal inspection.
5. When the project is completed on the same day, the pipe end should be blocked with a blind plate to prevent mud and water from entering the pipe.
6, prefabricated insulation pipe has cold installation, hot prestressed installation and one-time compensator installation three ways.
7. Cold installation is to directly connect the sections of the pipe section, and after the inspection is passed, it can be backfilled according to the standard;
8. The hot prestressed installation is to first weld the pipe to 60% of the working temperature, and then backfill it.
9. The one-time compensator must be welded when the pipe is heated to 60% of the working temperature, and then backfilled and compacted.
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