PE pipes are very important in the construction process, which is related to ensuring that there will be no problems or leakage accidents during long-term use. So there are technical requirements for his construction.
1. Construction sequence: digging trenches, installing pipelines, partially backfilling, pressure testing, laying marker posts, and fully backfilling.
2. The section of the pipe trench and the foundation of the pipeline, as well as the size of the excavation section of the pipe trench, have a significant impact on the construction progress and cost. Usually, longer pipelines are prefabricated on the ground to reduce the excavation width of the trench.
The pipeline foundation requires flatness and sufficient strength, and excavation of the pipe trench must prevent disturbance to the original soil of the foundation. When manually excavating pipe trenches, it is required that the bottom of the trench be flat, dense, and free of sharp objects. The bottom of the ditch can have undulations, but it must support the pipe smoothly. If there is over excavation, it must be backfilled and compacted.
3. Pipeline connection
(1) Choose the connection method, which mainly includes hot melt connection, mechanical connection, electric melt connection, etc. The hot melt connection method is widely used due to its advantages such as low cost, good pipeline interface quality, and no need for pipe fittings.
(2) Key points for quality control of hot melt connections: Hot melt connections require high technical skills from operators, and attention should be paid to the appearance inspection of interface quality, requiring the formation of uniform flanges at the interface.
In the application process, it often encounters the problem of connecting the main pipe according to actual needs. Traditional pipes must first cut off a section of the main pipe and then install a tee to complete the connection. The saddle tee can be connected using a saddle docking method, that is, a saddle docking welding machine is used to directly connect a saddle tee to the main pipe, and then the equipped cutting knife is used to cut the main pipe. This completes the tapping of the main pipe, and the construction is very fast.
When connecting PE pipes, steel pipes, and valves with steel pipe flanges, it is advisable to use steel plastic flange connections: the PE pipes can be connected to the corresponding plastic support rings using hot melt butt welding. The connection between the steel pipe end and the metal flange should comply with the corresponding steel pipe welding regulations. Then, the flange plate can be used to complete its connection with the steel pipe.
Flange connections are also applicable for their mutual connections. Generally speaking, there is no need for a sealing ring between them, but it is still necessary to add a sealing ring under large-sized and high-pressure working conditions. When the PE pipe support ring is flanged with pipes of other materials, a sealing ring must be used.
Have you understood the detailed introduction of the technical requirements for PE pipes? Once you have mastered the technical requirements, you will be very proficient in practical operation.