The chassis drives powerful permanent rare-earth magnetic bridges over the tank floor plate, saturating the carbon steel to its magnetic limit. Where localized volume loss or corrosion pitting exists, the magnetic field lines burst outward, escaping the steel boundary. The 256-sensor Hall Effect array logs this escaping magnetic flux, calculating material volume loss based on the signal amplitude. Floormap3Di-R | MFL Tank Floor Scanner | Nexxis USA

The Floormap3D I-R MFL tank inspection is a powerful NDT technique that provides accurate, detailed information about the condition of storage tanks. Its benefits, including accurate defect detection, detailed 3D mapping, increased safety, and reduced downtime, make it an attractive option for industries that rely on storage tanks.

It’s powerful but not intuitive. Setting up a new tank geometry (especially with odd-shaped sumps or internal columns) takes frustratingly long. The first time, you’ll need a 2-hour call with Silverwing support. Once templates are saved, it’s fine, but the initial learning curve is steep.

Buy the “advanced pit analysis” module upfront. Without it, the automated depth sizing is only ±15%. With it, and proper calibration on an NTS plate, we regularly achieve ±5% compared to UT.

This is not a “starter” MFL tool. Between the scanner, Rover-R robot, cables, and annual software licenses, you’re easily over $150k. If you only inspect one or two tanks per year, this is overkill—stick with a hand-pushed Floormap3Di (non-robotic).