Tank Floor Inspection
KontrollTechnik GmbH uses two types of SLOFEC® FloorScanner. The main differences are the weight, the dimensions and the testable wall thickness, respectively the application to a maximal coating thickness. The SLOFEC® FloorScanners allow to inspect tank floors with wall thickness up to 25 mm and coatings up to 10 mm in a more effective way than other methods. The SLOFEC® FloorScanners are designed to cover the maximum of inspectable areas – including areas unreachable for other systems.
SLOFEC® FloorScanner FS300PM.V2
| Testable plate thickness range | up to 14 mm – without coating up to 8 mm – with 4 mm coating thickness |
|---|---|
| Minimal space under obstacles | 130 mm |
SLOFEC® FloorScanner FS400EM.V2
| Testable plate thickness range | up to 25 mm – without coating up to 12 mm – with 10 mm coating thickness |
|---|---|
| Minimal space under obstacles | 300 mm |
Scanning Procedure with the SLOFEC® System
The SLOFEC® Scanner System consists of the SLOFEC® Scanner and the eddy current computer for data acquisition and data analysis.
The SLOFEC® Scanner will be operated by an assistant, who is in permanent contact with the SLOFEC® operator. The SLOFEC® operator and the scanner assistant agree the track position and the direction of scan movement. During inspection, the SLOFEC® operator records the data and analyses the signals online.
The sensor arrangement of the FS300PM.V2 and FS400EM.V2 floor scanners allows the testing close to welds and to the tank wall. The untested space to the tank wall is approx. 20 mm and at both sides of longitudinal welds approx. 10 mm.
System calibration
The depth of corrosion pits will be analysed in comparison to artificially made reference defects. In order to achieve an optimal instrument setting, a calibration plate of the same material and thickness as the plates in the tank floor to test will be used.
During the testing indications from corrosion will be periodically re-inspected by ultrasonic test and the results compared with the result of the SLOFEC® testing. In case of deviations the SLOFEC® system can be re-adjusted in order to achieve an optimal defect depth analysis.
Advantages of the SLOFEC® Method
- sensitive and safe defect detection
- separation between signals from topside and underside defects
- separation between signals from defects and noise
- small untested zones close to the tank wall and to plate welds
- testing under installations and heating pipes down to 130 mm space
- testing of plates up to 25 mm thickness (the testable plate thickness depends on the scanner type)
- high testing speed
- no coupling fluid is necessary
- testing through non-conductive coatings up to 10 mm thickness
- comprehensive result documentation in 2D colour scan inclusive single plate report, feature list and repair plate input
Result Documentation
The result documentation consists of a coloured tank floor map, single plate reports and if required feature list, repair plate map and repair plate list. In the tank floor map and single plate reports wall thickness reductions will be shown in a 2D-scan image, where the defect depth corresponds to a defined colour.
Documentation
- Inspection overview – shows the inspected area
- Scan defect map – shows colored mapping of defects
- Scan report – shows detailed colored mapping of defects in defined areas
- General settings report – parameters of equipment, calibration and subject data
