What are the types of pipe cleaning pigs
Commonly cleaned natural gas pipelines clean pigs have piglets, polyurethane foam pipe cleaning pigs, mechanical pipe cleaning pigs, caliper pipe cleaning pigs, smart pipe cleaning pigs (leakage testing pipeline cleaning pigs), and to reduce the sequential delivery of mixed oil Isolated pipe cleaning pig. Here is a detailed explanation of the type of pipe cleaning pigs.
Clear tube
The pig is made of neoprene, hollow, and the wall thickness is 10% (30~95 mm). The check valve is controlled by the check valve of the water injection vent hole on the pigging ball to control the pipe clearing. the amount. The pig cleaning ball mainly removes the liquid in the pipe and the separation medium, including the isolation of different oil products in the sequential transmission of oil, and excludes the air inside the pipe during the pipeline water pressure test. The shortcoming of the pig is that the ability to remove the block and dust is poor. For example, if the diameter of the branch pipe is larger than 1/2 of the diameter of the main pipe, or the equal-diameter tee, and there is no protective baffle, it is easy to cause the ball to malfunction.
2. Polyurethane foam pipe cleaning pig
The length of the polyurethane foam pipe cleaning pig is 1.75~2 times, the interference is generally 25 mm or the pipe diameter is 5%~10%, and it has high elasticity, toughness and certain wear resistance. The deformation exceeds 50%. . The foam pipe cleaning pig has strong passing ability and is easy to pass through the elbow. Even if the jam occurs, it can rely on its high deformation performance to pass, or increase the pressure to break it, and unblock the pipe by itself, without causing a rolling accident. Foam Pipe Cleaning Pig's foam debris does not cause any damage to the inner wall of the pipe and is suitable for cleaning pipes with inner wall coating. The disadvantage is that the ability to remove debris is general, mainly used for water absorption and cleaning of pipes, and can only be used once and has a short running distance.
3. Mechanical pipe cleaning pig
Mechanical pipe cleaning pigs can not only remove the liquid in the pipe, but also remove solid impurities, and install steel brushes and scrapers as needed to enhance the pigging effect. Mechanical pipe cleaning pigs have a long service life and can generally run 800~1000 km. They can be equipped with tracking equipment, caliper plates and magnets. The disadvantage is that the passability is slightly poor, and it is not suitable for multiple bends, valves and pipes with large deformation.
4. Measuring pipe cleaning pig
The caliper cleaning pig measures the geometry, ellipticity, unevenness and weld penetration of the pipe to provide the original basic data of the pipeline condition, and provides the basis for pipeline maintenance and pigging. The diameter of the diameter measuring pig is about 60% of the diameter of the pipe. The cup is flexible and can pass through the hole of the shrinkage hole by 15%. The key technologies for caliper cleaning pigs are speed control, inspection accuracy, reliability, and post-processing data analysis. Before the intelligent pigging (in-pipe inspection), the caliper pipe should be fired first to clean the pigs, determine the internal condition of the pipe, and test the pipeline passing capacity.
5. Intelligent pipe cleaning pig
Intelligent pipe cleaning pigs consist of data acquisition sensors, support systems, drive systems, cups (steel brushes), probes, power systems and signal processing systems, which are 4 to 5 times longer than regular pipe cleaning pigs. In order to make the pipeline inspection smoothly, the ordinary pipeline cleaning pigs are fired before the intelligent pipeline is cleaned, and the pipeline is cleaned, and then the caliper pig is launched to determine the internal condition and the passage capacity of the pipeline. Pipeline information determined by intelligent pipe cleaning pig collection includes pipe geometry deformation measurement, pipe dent, wrinkle, ellipticity, bend radius and other information; pipe metal loss, wax deposition and corrosion degree; pipe crack defect location, area and severity.
The above is about the type of pipe cleaning pigs. I hope that everyone can understand the type of pipe cleaning pigs, and it is helpful for everyone to choose to use pipes to clean pigs.
