Tank Bottom Corrosion Screening. Compact, Easy-to-use Mini MFL Scanner

Handscan MFL corrosion detection mini-scanner from Silverwing is designed to complement the Floormap range floor scanners.


  • High PoD of corrosion issues
  • Easy to use by any operator
  • Ideal Floormap companion for inaccessible or hard-to-reach areas such as under heater coils
  • Low profile with extendable handle for unlimited applications
  • Suitable for shell-to-annular areas and under pipework
  • Latest-generation permanent magnet technology
  • Separate battery-operated light MFL control module
  • Cost-effective inspection tool


Signals from corrosion, above the operator-controllable threshold, appear as visual and audible alarms. Its low-profile and extendable handle enable scanning in otherwise inaccessible areas of storage tanks such as the shell-to-annular area, under pipework and heater coils.

Inspection data from the Handscan can be added into the SIMS reporting software manually when used in conjunction with the Floormap floor scanners to produce a complete fingerprint of a tank floor’s condition.

How It Works

The operator first connects the sensor cable to the scanner head and electronics module. The MFL control module is then turned on, the required floor thickness configured, and the alarm sensitivity is adjusted using a reference plate with known artificial defects. All the operator has to do then is push the scanner head and monitor the MFL control module for alarms. Any area identified by Handscan can then be marked for further analysis with a secondary inspection technique, usually Ultrasonic Testing (UT).



Operational principle
  • Magnetic-flux leakage
  • 16 off Hall effect sensors
Scan width
  • 150 mm (6 in)
Propulsion method
  • Manual pushing/pulling
  • 0.5 m/s (1.6 ft/s)
  • Extendable
  • Required clearance under pipework: 120 mm (4.7 in)
Maximum thickness
  • 15 mm (0.6 in)
Test through coatings
  • Yes, if non magnetic
Maximum coating thickness
  • 6 mm (0.24 in)
Maximum sensitivity
  • 10% underfloor on uncoated 6 mm (0.24 in) plates
  • 20% underfloor on coated 6 mm (0.24 in) plates
  • 5 m (16.4 ft)
Power requirements
  • 12 V battery operation
Transit case
  • Meets IATA requirements for transporting magnetizable material
Operating weight
  • 18 kg (39.6 lb)—scanner head and MFL control module