Installation precautions for HDPE pipes in municipal engineering
High-density polyethylene (HDPE) pipes have been widely used in the field of municipal engineering due to their excellent corrosion resistance, flexibility, connection reliability and long service life, especially in water supply and drainage, gas, power sheathing and sewage treatment systems. However, HDPE pipes still need to strictly follow the specifications during installation to ensure the quality of the project and the safety and stability of pipeline operation.
Preparation before construction
1. Material acceptance: Confirm that the HDPE pipes and fittings used meet the design and national standards, and check whether there are cracks, scratches, deformation and other defects on the surface of the pipe.
2. Construction site inspection: Clean the construction site to ensure that the foundation is flat and there are no sharp stones or hard objects to prevent damage during pipeline laying.
3. Equipment preparation: Prepare corresponding Pipe Welding Machine, hot melt sleeve machine, electric melting machine according to the scale of the project.
Key points for installing HDPE pipes
1. Correct handling and storage:
Handle with care during handling to avoid severe impact and falling.
Place the pipe on a flat surface during storage to avoid long-term direct sunlight and heavy pressure.
2. Selection of pipe connection method:
Butt-melt: Suitable for the connection of large-diameter straight pipes. The welding surface must be kept clean, and the welding temperature and pressure must meet the standards.
Electrofusion connection: Suitable for connection with limited space or special pipe fittings. The welding surface should be cleaned before connection, and the operation should be strictly carried out in accordance with the parameters provided by the electrofusion pipe fitting manufacturer.
Flange connection: Suitable for connection with metal pipes or equipment interfaces. Sealing gaskets should be used to tighten the bolts evenly.
3. Pipeline laying and backfilling:
Pipeline laying should be straight and stable, and the turning point should be constructed according to the minimum bending radius to prevent damage caused by forced bending.
Backfill soil should be compacted in layers. It is forbidden to directly roll the top of the pipe with large machinery to avoid local pressure causing pipe deformation.
Issues to be noted during construction
1. Temperature influence:
HDPE materials are greatly affected by temperature. During winter construction, the heating and cooling time should be appropriately extended, and in summer, overheating and deformation should be prevented.
2. Welding quality control:
After each welding, the flatness and uniformity of the weld should be checked, and the welding strength test should be performed if necessary to ensure that the welding is firm and reliable.
3. Prevent foreign matter from entering the pipeline:
During the installation process, the pipeline opening should be temporarily blocked to prevent mud and debris from entering and affecting subsequent use.
Completion acceptance and pressure test
Pressure test: After the installation is completed, a water pressure or air pressure test should be carried out according to the specifications to check the sealing and pressure bearing capacity of the pipeline system.
Inspection of the interface between the inspection well and the pipeline: Ensure that the interface between the inspection well and the pipeline is tight and there is no leakage.
Completion data is complete: including construction records, welding records, pressure test records, etc., to provide guarantees for subsequent operation and maintenance.
Later maintenance suggestions
Regularly check the operation of the pipeline, focusing on the ground settlement area and the interface.
For areas with shallow burial depth and large external force influence, protective measures can be added to extend the service life.
The application of HDPE pipes in municipal engineering not only improves the durability and economy of the pipe network, but every detail in the installation process cannot be ignored. Scientific and standardized construction management is the key to ensuring the long-term safe operation of the HDPE pipe system.
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