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6 December 2023

How magnets work in diesel flow

While it is true that conventional mechanical filters can remove particles in the same size range as magnetic filters, the majority of these filters are disposable and incur a cost for each gram of particles removed.

There are other penalties for using  only conventional filtration, including energy/power consumption due to flow restriction caused by the fine pore-size filter media. As pores become plugged with particles, the restriction increases proportionally, causing the power needed to filter the diesel to escalate.

Magnet has played a prominent role in the separation of ferrous solids from fluid streams. While a large number of configurations exist, most magnetic filters work by producing a magnetic field or loading zones that collect magnetic iron and steel particles. Magnets are geometrically arranged to form a magnetic field having a non uniform flux density (flux density is also referred to as magnetic strength).

How do magnetic filters work?

Magnets are geometrically arranged to form a magnetic field that has a non-uniform flow density (flow density is also referred to as magnetic power)

Particles separate more efficiently when there is a strong magnetic inclination from low to high. In other words, the higher the magnetic inclination, the stronger the magnetic force that attracts the particles that pull them to the loading zones. The power of the magnetic gradation is determined by the flow density, distance and alignment of the magnets.

Various types of magnets can be used in these filters. The magnets used in some filters can have a flow density (magnetic power) of up to 28,000 gauss. Compare this level with an ordinary refrigerator magnet between 60 and 80 gauss. The higher the flow density, the greater the possible magnetic inclination and magnetic force acting on nearby iron and steel particles.

While there are many configurations of magnetic filters and separators used in process industries, the following is a general classification for common magnetic products used in lubricating oil and hydraulic fluid applications.

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