Floormap MFL Tank Bottom Inspection

The Leader. Made Faster.

The Silverwing Floormap tank bottom inspection system combines two technologies: Magnetic-Flux Leakage (MFL) and Surface Topology Air-gap Reluctance Sensors (STARS). Featuring top and bottom plate corrosion views and capable of going as fast as 1 m/s (3.2 ft/s), Floormap improves the complete tank inspection process.



  • Top and bottom plate corrosion views
  • High-speed up to 1m/s
  • Motor-driven for consistent results
  • Easy to understand corrosion data
  • Dedicated reporting software
  • 3 operating modes, mapping, stop-on-defect, and free-scan


  • Storage tank bottoms/floor
  • Storage tank roofs
  • Screening of annular plates
  • Ship decks

Want to see Floormap in action? Book a demo!

Two Technologies: MFL and STARS

Magnetic Flux Leakage (MFL)

MFL is a rapid and robust corrosion detection technique. It relies upon strategically placed Hall effect sensors to detect the magnetic leaking field that is created by corrosion. On its own, MFL cannot differentiate if the corrosion is topside or bottom side of the tank bottom.

Surface Topology Air-gap Reluctance Sensors (STARS)

STARS is a patented technology that determines whether corrosion is top side or bottom side. When combined with MFL users can switch between top side, bottom side, and complete plate views to show the origin of the corrosion. STARS also provides a simple visual representation of the inspection surface through thick non-magnetic material up to 10 mm (0.39 po) thick.

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The high-resolution sensors of Floormap yield an excellent Probability of Detection (PoD) of a defect as small as 2 mm (0.08 in) in diameter. When used with advanced signal processing and defect classification tools, corrosion detection and sizing capability are significantly improved over other systems. Results translate on-screen into easy-to-interpret views of scanned areas, making it easier to understand the condition of tank bottoms.

Variable Speed

Floormaps are some of the fastest motor-driven scanners on the market. It is capable of variable speeds up to 1 m/s (3.2 ft/s), which is twice as fast compared to the previous model improving inspection efficiency and reducing the time spent in tanks.

Data Acquisition

Floormap collects crucial inspection data very quickly, which is made possible by the high-power, rugged touch-screen computer, and advanced software processing built-in. Floormap produces detailed plan views of inspection areas, enabling operators to view scanned tracks and switch between multiple views, which are all designed to offer a more in-depth understanding of the tank bottoms without the need for complex signal interpretation, as seen with other NDT technologies. So, basically, the operator views an image of the scanned surface and simply determines the nature and geometry, the location and percentage loss of a defect.

These powerful tools can speed up the inspection process, reduce the amount of UT prove up, while increasing inspection confidence, which leads to better Risk-Based Inspection (RBI) calculations.

Having this information in an easy-to-understand format leads to faster and more reliable inspections and maintenance decisions.

MFL View
Details all defects in the unfiltered RAW representation.

Shows only top-side defects, even through coatings up to 10 mm (0.25 in).

MFLi High-intensity View
Helps to classify corrosion.

Available Models


Advanced model combining the benefits of Floormap-R and Floormap3DiM-R for a full-featured system offering maximum flexibility. Three inspection modes: Mapping, free-scan and stop-on-defect.



Intermediate model including a mapping mode. Unlike Floormap-R, Floormap3Di-R captures, saves, and produces corrosion maps of tank bottoms. You can analyze the maps after each scan or perform post-inspection in the dedicated SIMS reporting software, enabling tank engineers to compare and review historical data sets to determine optimal repair strategies.


Basic model with free-scan and stop-on-defect modes designed to rapidly screen storage tank bottoms. Free-scan mode displays live MFL views of the plate, color-coded to show the magnitude of MFL signals or as simple black-and-white views only showing defects above a preset threshold. Stop-on-defect mode stops the scanner whenever defects are detected above a preset threshold.

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Operational principles
  • Magnetic-Flux Leakage (MFL) and Surface Topology Air-gap Reluctance Sensors (STARS)
Detection method
  • 256 Hall effect sensors, 64 channels
Top and bottom discrimination
  • Yes, using STARS technology
Test through coating
  • Yes, if non magnetic
  • Variable, 500 mm/s to 1 m/s (19.7 in/s to 3.3 ft/s)
Maximum scan width
  • 300 mm (12 in)
Maximum single scan length
  • 32 m (105 ft)
Positional accuracy
  • ± 0.04% (± 3 mm over 8 m) (± 3/32 in over 26 ft)
Dimensions (W × D × H)
  • 510.0 × 690.0 × 980.5 mm (20.0 × 27.1 × 38.7 in)
Minimum man-way size
  • 500 mm (20 in)
Transit case
  • Meets IATA requirements for transporting magnetisable material
Power requirements
  • 1 × 12 V, 42 A/h, sealed, lead acid batteries
  • Supplied with two batteries and two chargers for continuous use
  • Up to 4 hours, typical
Operating temperature
  • -30–55 °C (-22–131 °F)
Relative humidity
  • 10–95%
Real-time analysis
  • Defect size, X/Y position, plate view, top/bottom, MFL, MFLi, STARS
SIMS reporting suite
  • Full version—three user licenses included
  • Read-only version—unlimited
  • Operating system requirements: Windows® XP, Windows Vista, Windows 7, Windows 8, or Windows 10
  • 5-day training and examination
  • 2-week level 1 and level 2 SNT courses