advanced inspection equipment
mec-floorscanners new

MEC-Floorscanners

The MEC-Floorscanners have been proven in the field to have a high Probability of Detection (POD) of approx. 95% for pitting and general corrosion. A high detection reliability rate for corrosion is essential to the condition assessment or risk-based inspection and for all subsequent decisions.

 

The MEC-Floorscanners offers an alternative cost effective solution with the benefits of a reliable and thorough inspection for a peace of mind.

The MEC-Floorscanners are designed to cover the maximum inspectable areas of the shell including areas unreachable by other inspection systems and offer the following features and benefits in terms of defect assessment, integrity and monitoring support:

  • High defect detection sensitivity for tank floors with
    • plate thickness up to 30mm
    • coating and composite thickness up to 10mm
    • temperatures up to 150 deg C
  • High inspection speed of approx. 25m/min with minimal surface preparation prior to inspection
  • Ability to inspect stainless steel, carbon steel and non-ferromagnetic tank floors
  • Ability to inspect lined and unlined tank floors
  • Ability to detect corrosion at the overlap welds in lined tanks
  • Minimal dead zone on the floor plates adjacent to the tank shell and floor plate overlaps with the ability to inspect almost straight to the tank shell.
  • Differentiation between topside and underside defects through separate mapping

 

The MEC-Floorscanners offer the following advantages in comparison to the Saturation Low Frequency Eddy Current Floorscanners:

  • More powerful magnetic unit
  • Integrated hall sensor for immediate control of flux level
  • Display to show flux level for the control of wall thickness range
  • Fast magnet on/off switch
  • Eddy Current electronics with single sensor pre-gain
  • Data acquisition via TCP and with a standard rugged notebook
  • Notebook can be mounted on the floorscanner control unit
  • Power supply in an easy-to-carry Pelicase box
  • Optional headset for communication

 

Due to its electromagnetic background, the Saturation Low Frequency Eddy Current technique on which the MEC-Floorscanners is based is often compared to the Magnetic Flux Leakage (MFL) technique. However the advantages of the Saturation Low Frequency Eddy Current technique against the MFL technique for the inspection of storage tank floors has proven to be multiple.

The table below shows the comparison between the two techniques.


Saturation Low Frequency Eddy Current

Magnetic Flux Leakage

Plate thickness

Up to 30mm

Up to 10 mm

Coating

Up to 10mm for any type of coating

Up to 2mm

Distinguish defects from false calls

Yes (by Signal Phase)

No

Distinguishing topside from underside defects

Yes (by Signal Phase)

No

Material magnetic properties

Allows tolerances

Have to remain constant

Defect detection sensitivity

From below 20% wall loss

From > 20% wall loss

Shape of corrosion

Relative independent

More dependant

Saturation level in parent material

Little influence as no saturation is required

Strong influence as saturation is required

Mapping

Yes (by Signal Phase)

Separate for topside and underside

Limited

Inspecting close to the shell

Yes (by Signal Phase); Dead zone ~ 20mm

-

Speed

20-30m/min, independent of speed change

20-30m/min, influenced by speed change

Preparation prior to inspection

Low preparation and limited cleaning required

Higher preparation and cleaning required