Project Description

Oil and Gas pipelines are used in harsh environments and regular cleaning of the pipelines prevents the build-up of waste in the pipelines, improves the total flow and efficiency of the system and also helps to prevent corrosion and other forms of damage. The cleaning pigs are designed to clean pipes effectively and usually contain many powerful giant neodymium magnets.


The powerful permanent magnets are a vital component in cleaning pigs. They have high magnetic force, capable of attracting ferrous debris from a distance. They are usually in the form of components for easy mounting. The use of multiple rows of magnet boxes in the cleaning pigs is to ensure that they cover the maximum internal diameter of the pipe.

N42 N50M Strong Permanent Magnets for Oil & Gas Industry

The neodymium magnets have higher remanence, coercivity, and energy product, increasing magnetic force and making the product more compact. But they are sensitive to oxidation and require surface treatment, like NiCuNi.

NdFeB magnets are available in various temperature ratings, from 80-220℃. The specific application determines the choice between ambient and high-temperature magnets. The current range of magnet materials for pipeline cleaning pigs includes grades N35 and N42 (80°C), N52 (60°C), N50M and N52M (100°C), N40H, N48H to N52H (120°C).

While expensive, the benefits of utilizing neodymium magnets on pipeline cleaning pigs far outweigh the cost, as they can remove ferrous debrisfrom a pipeline, ensuring the line is ready for an In-Line Inspection.

Ferrite magnets are another type of permanent magnet used in cleaning pigs, with low cost and high corrosion resistance. Though not as powerful as neodymium magnets, their high coercivity and low cost make them ideal for high temperature applications.


The most common shape of the permanent magnets we currently produce for pig accessories is in block form. However, if you require segment or round magnets, we can customise them to your specific requirements.

Square magnets are simple in structure and generally easy to machine. However, for very large size block, the production is not as simple. Not all large size magnets can be machined due to the limitations of the tooling and material properties. The largest NdFeB magnet block we can currently make is about 200x200x35 mm, and the grade is N35. If you need a high temperature grade, such as N48H, the maximum square size is about 100x100x30 mm, 200x50x50mm.

Also if the magnetisation direction is too long, the blanks cannot be pressed out or the magnet may be magnetised without saturation. Currently our longest magnetization direction is around 50-65 mm. And if the rectangle magnet is very large, we can use several smaller magnet blocks assemblied into the big size you want.

Custom Large Neodymium Magnets Block for Pipeline cleaning Pig


Usually the magnet block will be fully encased by stainless steel boxes and then installed on the metal bodies of the pipeline cleaning pigs. China Magnets Source has extensive experience in the production of custom magnetic assemblies.

  • Expertise – Our team of engineers can help you choose the right magnet material, coating, glue, production method, etc.
  • Software – We are able to use finite element analysis modelling to ensure optimum design.
  • Hardware – We can design and manufacture all kinds of fixtures in-house. For complex magnetic assemblies that is enclosed in a durable housing, we can provide Ultrasonic welding.


custom dipole magnet, halbach cylinder, China Magnets Source, magnet supplier
custom N52 flat Halbach, China Magnets Source, magnet supplier
custom segment halbach, China Magnets Source, magnet supplier
Linear halbach magnet, China Magnets Source, magnet supplier

Our high performance magnets and magnetic components can endure and withstand the extreme conditions faced within oil and gas: both on and off shore and from shallow wells to geothermal depths.

In addition to magnetic cleaning pig, we also supply high performance magnets and magnetic components for many other applications in the oil and gas industry, including:

  • Drives
  • Sensors
  • Drilling
  • Couplings
  • Lifting Magnets
  • Separation & Filtration
  • Magnetic Holding & Mounting
  • Pipeline marker magnet assemblies
  • Non-destructive pipeline inspection


China Magnets Source is committed to providing a customized, high-quality magnet for the oil and gas industry. By the way, Logo is available to add for magnetic box assembly according to your requirement.

If you are a project manager and your pipeline inspection project requires these high-performance built-in magnets or magnetic assemblies, whether you are buying magnet samples or bulk quantities, please do not hesitate to contact us. Our experts will make the perfect choice for your needs.

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