1. Interference fit to form a seal: Interference fit between the foam pig and the pipeline is realized, that is, the outer diameter of the pig is slightly larger than the inner diameter of the pipeline, so as to form a seal between the pig and the inner wall of the pipeline, isolating the front and rear fluids.
2. Pressure difference pushes operation: Due to the sealing between the pig and the inner wall of the pipeline, it will cause a pressure difference before and after the pig, and this pressure difference will push the pig to run along the pipeline.
3. Remove impurities in the pipeline: The foam pig relies on the scraping and scouring effect of itself or its equipment to remove the scale or sediment in the pipeline.
4. Material characteristics: The foam pig is usually made of foam rubber or foam plastic, which has good elasticity and flexibility, and is easy to pass through elbows with a small radius of curvature, which is suitable for water removal and drying inside the pipeline.
5. Wear-resistant scraping materials: Some foam pigs are cross-wound and coated with various wear-resistant scraping materials at their tail or surface to enhance their ability to remove impurities in the pipeline.
6. Electronic tracking system: Some foam pigs can carry electromagnetic emitting devices, which together with ground receiving instruments form an electronic tracking system to monitor the position and status of the pig in the pipeline.
7. Adapt to complex pipeline conditions: Due to its high elasticity and toughness, the deformation amount of the foam pig exceeds 50%, so it has a strong passing ability, even in the event of jamming, it can rely on its high deformation performance to pass, or by increasing the pressure to make it rupture, and release the pipe blockage by itself.
To sum up, the principle of the foam pig is to form a seal through its interference with the inner wall of the pipeline, use the pressure difference in the pipeline to drive the pig to run, and rely on its own scraping and scouring action to remove impurities in the pipeline. At the same time, the characteristics of its material enable it to adapt to complex pipeline conditions and effectively complete pipeline cleaning operations.
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