Corrosion Mapping with Sonotech

It is important to recognise corrosion / erosion patterns as early as possible. Sonotech has different ultrasonic systems available to determine the remaining lifetime of the plant, based on the measured corrosion and erosion rates.

It is important to recognise corrosion / erosion patterns as early as possible

Today many plants follow a predictive maintenance strategy. It is therefore important to recognise corrosion / erosion patterns as early as possible. Different ultrasonic systems are available to determine the remaining lifetime of the plant, based on the measured corrosion and erosion rates. The measurement data will be entered into the RBI database. The accuracy of the measurement is very important for the output of the RBI database.

The following inspection techniques are available for Corrosion Mapping:

  • SeeScan corrosion mapping with video tracking
  • Hydroform PAUT corrosion mapping technique
  • PAUT Line scans for wall thickness measurement
  • TOFD line scans for wall thickness measurement
  • Manual wall thickness spot / point measurements

Protect your assets with our SeeScan® corrosion mapping solution

Effective corrosion maintenance strategies can positively impact the safe and profitable operational performance of your industrial equipment and ultimately prevent an unexpected and costly shutdown of your entire plant. It is therefore critical to be able to identify signs of aggressive corrosion early, in order to develop tailored and targeted strategies.

Our SeeScan® corrosion mapping solution assists you in developing maintenance strategies based on the actual condition of your assets. Easily integrated with an existing structured maintenance program, SeeScan® can provide information you need to precisely calculate the remaining lifetime of your industrial plant. Providing visual results in an easy-to-understand topographical color map and comprehensive reporting on affected areas, SeeScan® helps you to avoid unplanned shutdowns. Highly trained in ultrasonic corrosion detection, our specialists are on hand to conduct corrosion mapping services anywhere in the world.

Our qualified inspectors have extensive experience in providing non-destructive testing services for diverse global customers. We implement state-of-the-art technology to fulfill your individual inspection requirements. Our specialized SeeScan® corrosion mapping solution enhances inspection quality, simplifies processes, speeds up inspection and presents clear results.

Make an appointment and let SeeScan® corrosion mapping work for you!

Functional and profitable with accurate corrosion mapping services

Benefit from the advantages of our corrosion mapping services.

SeeScan® corrosion mapping can accurately monitor progressive damage so that you can develop effective and cost-efficient maintenance strategies. With SeeScan® you can conduct online measurements at high temperatures to improve the probability of detecting corrosion and precisely pinpoint developing trends. Mapping many different as well as complex geometries, SeeScan® provides visual data about a defined test area. This way it presents thickness measurement results in an easy-to-understand topographical color map.

SeeScan® corrosion mapping services reduce costs and minimize inspection times to support you in maintaining the operational functionality and profitability of your assets and investments.

Corrosion mapping with our SeeScan® inspection approach

Combining conventional ultrasonic testing procedures with miniature video camera technology, SeeScan® provides a simple yet highly effective method of collecting and displaying ultrasonic data during corrosion inspection.

Using a small video camera, SeeScan® records data via a tiny infrared LED light mounted on top of a transducer. The infrared light generates a bright spot, which is assigned a coordinate on the X-Y pixel matrix of the video image. The system simultaneously tracks a synchronized ultrasonic signal and converts the measured thickness or amplitude to a correlating color. The combined information is then displayed on the monitor in real time as a composite color image to provide you clear and accurate data in an easy-to-read format.

SeeScan® evaluates the condition of:

  • Lines and piping
  • Vessels that cannot be opened due to economic or operational reasons
  • Systems prone to hydrogen damage
  • Complex structures such as valves, tee pieces and dome ends

SeeScan® enables you to conduct non-invasive, in-service inspection at temperatures ranging from -25° C to over 300° C.


An important factor is the reproducibility of the measurements. Measuring exact on the same location is essential, to avoid false assumption on corrosion rates. Manual wall thickness measurements are taken at key points only. There is a large chance that the actual thinnest point at the measurement location is missed, even when the procedures prescribes a 100% inspection. Other error sources can come from different equipment settings, changed surface conditions and operator errors. It is therefore risky to use the obtained wall thickness data for trending purposes as it can lead to large deviations between subsequent inspections. These deviations in corrosion and erosion rates influences the remaining life time calculations adversely. The SonoInspec corrosion mapping technologies eliminate these drawbacks.


Hydroform is a semi-automated phased array solution for corrosion mapping. The probe has a permanent water column for coupling, comparable with an immersion-tank inspection technology. Therefore, a wedge is not needed and wedge echoes are banished to the past. Hydroform is a manual propelled fast corrosion mapping tool. The near-surface resolution is excellent because of the permanent water column. The hydroform tool is not available for corrosion mapping on objects at high temperature.

PAUT line scans

PAUT line scans is a fast and simple way for mapping the wall thickness. The probe is connected to a wheel encoder for axial positioning. The high temperature phased array probes can be used to detect area’s with material loss up to 350°C (662°F).

TOFD line scans

Especially when wall thickness measurements are required at very high temperature >350°C (662°F), TOFD line scans can be an excellent solution. TOFD is an extreme accurate measuring technology. The coverage can be guaranteed by marking up a grid for inspection.

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