Use and maintenance of PE non-excavation crossing pipes
PE non-excavation through pipes are generally connected by flanges. The flange root is made of antistatic and flame retardant PE material for flange connection. The flange root and the pipe body are directly butt welded together. The flange root is equipped with a loose metal flange, and the pipe is directly flanged and expanded to form the flange root. , And then equipped with a looper metal flange.
The connection method is the same as that of ordinary pipelines, but flanges and flanges can be bolted. It is not necessary to add a gasket when sealing itself.
If the landfill installation is not carried out, the non-excavation PE pipes must be fixed (branch, brackets, hangers, etc.) to ensure that the pipeline will not cause axial channeling under the action of pressure or water hammer (air hammer). To prevent the pipeline from being deformed or pulled from the flange connection.
Since the rigidity of PE non-excavation crossing pipes is lower than that of steel pipes, it is necessary to prevent the PE non-excavation crossing pipes from swinging and flexing under pressure. When installed vertically, the distance between the two fixed points should be no more than 2m.
For horizontal installation, the distance between the two fixed points should be ≤1100mm for pipes of Φ110 ～ Φ160; ≤1500mm for pipes of Φ160 ～ Φ225.
PE non-excavation through pipe installation principle Pipe elbows, tees, and different diameters are where the fluid changes greatly, which will generate fluctuations and impact forces, which will cause vibration at the pipe. These places will also be subject to fluid pressure. The thrust must be fixed by using a support bracket, etc. Fix it with cement or brick piers, etc., and lay pipes or fittings in the piers, similar to valves.
，对 PE非开挖穿越管内表面污垢进行高压水射流剥离清洗。 PE non-excavation through the pipe cleaning and nursing application of high-pressure water cleaning: high-pressure water jet using more than 50Mpa , PE non-excavation through the pipe internal surface dirt stripping and cleaning. This technology is mainly used for short-distance pipes, and the pipe diameter must be greater than 50cm. The PIG pigging technology relies on the driving force generated by the pump to drive the fluid to drive the PIG (pig cleaner) forward in the pipe, and the dirt accumulated in the PE non-excavation through the pipe is discharged out of the pipe to achieve the purpose of cleaning. Chemical cleaning of PE non-excavation crossing pipes is to use chemical agents to temporarily modify the pipeline. Temporary pipelines and circulating pump stations are used for circulating chemical cleaning from both ends of the pipeline. As the main material of non-excavation systems, PE non-excavation crossing pipes must be installed and maintained in strict accordance with relevant regulations.