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In the factory's dynamic pipe network and the city's central heating pipe network, due to the large temperature difference between when the pipeline is in operation and when it is deactivated, there is a large gap in the pipeline. thermal expansion. The use of metal bellows to compensate for the thermal expansion of these pipelines has obvious advantages over traditional compensation methods. Metal bellows have small footprint, good sealing performance, are not easy to leak, and have large compensation capabilities. Therefore, in recent years, power pipes in factories have Metal corrugated pipes are widely used in central heating pipe networks in China and cities. Different types of metal corrugated pipes are used depending on the layout of the pipeline.
The application of metal bellows in the connection between equipment and pipelines, equipment and equipment: Metal bellows is used as a flexible connecting pipe for pumps in the inlet and outlet pipelines of pumps. Universal corrugated pipes are installed on the inlet and outlet pipelines of the pump to compensate for the thermal expansion of the pipeline and reduce the thrust of the pipeline expansion on the pump or the vibration caused by the pump operation.
Metal corrugated pipes can be used for flexible connections between storage tanks and pipes. In recent years, storage tanks in oil fields, oil depots, and chemical plants have become larger and larger, and the position of outlet pipelines has changed, which can easily cause damage to the connecting pipelines and tank walls.
.Technical requirements
Comply with transportation industry standards/
.Raw materials: The raw materials of prestressed plastic corrugated pipes should be original granular raw materials. The use of powdered and reconstituted granular raw materials is strictly prohibited. High-density polyethylene () should meet the requirements of B/, and polypropylene should meet the requirements of B/.
3. Appearance: The appearance of the prestressed plastic corrugated pipe should be smooth and uniform in color. The inner and outer walls are not allowed to have broken partitions, bubbles, cracks, hard lumps and scratches that affect use.
. Ring stiffness: The ring stiffness of the prestressed plastic bellows shall not be less than
. Local lateral load: When the prestressed plastic bellows is subjected to lateral local loads, the surface of the pipe shall not be broken. The residual deformation of the pipe after unloading shall not be exceeds the outer diameter of the pipe.
.Flexibility: After the prestressed plastic corrugated pipe is repeatedly bent five times according to the prescribed bending method, and the special plug gauge can pass through the prestressed plastic corrugated pipe smoothly, the flexibility of the prestressed plastic corrugated pipe is qualified.
.Impact resistance: The maximum allowable value of vacuum impact rate R in the low-temperature drop weight impact test of prestressed plastic bellows is.
Storage precautions:
It should be stored away from heat sources and sources of oil and chemical pollution. Outdoor stacking cannot be placed directly on the ground and should be covered.
The storage location should be flat and the stacking height should not exceed 3.
The storage period is generally no more than one year from the date of production.
Supply of prestressed plastic corrugated pipes for bridges in Qinhuangdao, Hebei 15333383687