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Non destructive testing (NDT)
Non destructive testing (NDT) includes various test methods used to detect material defects and weaknesses that will show up over time. Common to the methods is that one avoids reducing the physical properties of the equipment. Non-destructive testing is used as part of the production or installation inspection to check that the quality requirements are met.
Thickness measurement
AQMA is certified in accordance with NS-EN ISO 9712 - NDT Ultrasound Testing (UT). We have extensive experience from inspection work, and can carry out thickness measurements on all types of vessels. The measurements are summarized in a report and comply with requirements for the respective class company.
  • Kunden stiller med GA-plan, platetegninger og rapporter fra tidligere tykkelsesmålinger. I forkant av inspeksjonen går vi igjennom minimum og orginaltykkelser i samråd med kunde og klasseselskap.
  • Access to the measuring points must be arranged (scaffolding/lift).
  • Work that may conflict with the measurements must be avoided (including welding, painting, high-pressure washing, grinding, etc.).


The transition from analogue to digital and portable devices has made Ultrasound testing one of the chosen and most widely used methods.

With Ultrasound Testing, we examine materials for hidden defects using sound pulses that are sent into the material and reflected from any defects. The method can be used on most metals (iron, steel, aluminum, concrete, etc.). It detects cracks, bonding defects, laminations and volumetric defects (slag and pores). Ultrasonic measurement is also used as the most common test method in connection with thickness measurement

Visual inspection is easily explained by what the inspector can see with his eyes and It is often used to detect defects in the surface.

By visually inspecting the object's surface, we can detect surface and welding defects such as cracks, pores, slag, edge wounds and more. Good lighting is important to detect irregularities using the VT methodology. It is the most underestimated, but at the same time most used NDT method.

Penetrant testing is used for materials that are not absorbent or porous, and it reveals cracks and other types of defects that break the surface. It is also used for leak testing.

A liquid with special penetrating properties is painted on the object and the liquid penetrates into the defective areas of the object. The liquid should then be washed away and a developer applied. The developer causes the liquid to be drawn out of the defective area, and as a result you will see a red bleeding field on the object.

Magnetic powder testing is limited to materials that can be magnetized and reveal defects in the surface. The method is favorable for thicker / coarser surfaces.

The object or workpiece is magnetized and then test agents are applied, at the same time as the object is inspected to assess the result. The object must be cleaned so that it is free of paint and other coatings that interfere with the magnetic field.

Radiography, or X-ray, is an effective method of checking a material or weld for internal defects. RT can be used on all types of material. 

For larger thicknesses (> 40 mm) UT is often used instead, as the quality of the radiographic image decreases its larger material thicknesses.

Eddy current is used to check a material or weld for defects both in and just below the surface.

The method has approximately similar applications to the magnetic powder method, but a great advantage is that you can also use eddy current on painted surfaces. This method is often used on objects that have been put into operation in connection with condition control.

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