What are the various types of magnetic particle testing used in tank inspection?

The engineering and tank storage sector relies heavily on facility upkeep and maintenance.

This implies that tank facility administrators and operators must remain updated on the newest auditing requirements for all of their facilities’ parts, equipment, and procedures. 

But how can this be done without interfering with everyday operations or jeopardizing the equipment’s integrity? This is where worldwide inspection services companies come into play. 

Many facilities have embraced non-destructive testing methods because of their consistent and accurate results and the testing process’s reliability. This kind of testing causes no harm to the equipment’s elements, implying that frequent testing is more practical. Facility administrators can rest assured that their premises are up to standard and that their staff is safe.

Magnetic particle assessment, which is used to find faults on the top of magnetic objects, is a form of non-destructive testing (NDT).

Testing for Magnetic Particles

During magnetic particle screening, an object or substrate is evaluated for surface and subsurface faults. Magnetic particle testing is often used to assess ferromagnetic materials, including iron, nickel, and cobalt.

Inspection Method

The technique of magnetic particle testing is two-fold: first, magnetize the object, and then disseminate metal particles over it while the magnetic field is still active.

API 653 tank inspections inspectors must first magnetize a surface with a magnetic current before examining a magnetic particle. This will highlight any possible surface flaws.

Direct Magnetization 

An electric current is transmitted directly through the item or surface being investigated in direct magnetization. In the ferromagnetic item, this produces a direct magnetic field.

Indirect Magnetization 

Instead of putting an electric charge via the item, indirect magnetization produces a magnetic field from the outside.

When determining the proper magnetic flow for magnetic particle inspection, tank inspectors must consider the object’s geometry, the sorts of defects to be detected, the type of material, and how shallow the current must be for faults to be identified.

If there are no external faults, the magnetic charge will stay constant along the surface of an object; nevertheless, if even a minor surface defect is found, the magnetic flow will be disrupted, causing the magnetic energy to expand out from the site of fault, resulting in a flux leakage field.

Inspectors scatter magnetic nanoparticles over the defect to make it apparent to the naked eye once one flux leakage field has been produced. Any flaws in the surface will attract the particles.

Testing of Wet Magnetic Particles

The magnetic atoms are dispersed out while hanging in a liquid carrier in a wet magnetic particle examination.

 Wet magnetic particle testing is more effective than dry magnetic particle screening at spreading an even covering of magnetic granules over the field. More minor surface flaws are observable when smaller rupture fields occur on the object’s surface because liquid particles flow more smoothly for more extended periods.

Dry Magnetic Particles Assessment

In dry magnetic particle testing, dust particles are used to look for surface flaws. Minor subsurface faults on rough surfaces or subterranean welds are commonly detected using this method.

The current causes a pulse when the field is magnetic, allowing the dust granules to travel over the field. The extra powder is softly blown away while the electromagnetic current is still administered. The particles will collect over the surface imperfections, similar to wet magnetic particle analysis, making the faults more visible.…