Silverwing is now part of Eddyfi Technologies
Tank Bottom Mapping

Magnetic Flux Leakage (MFL) is a perfect technique for tank bottom inspection, it allows for rapid screening of large areas compared to other methods such as ultrasonic (UT). Being able to screen more of the tank bottom results in a higher Probability of Detection (POD) which gives operators and engineers a far better understanding on the condition of the tank floor.

A perceived downside to using traditional MFL for tank bottom inspection is that the technique could not reliably size or determine the classification of the corrosion, whether it’s a, lake, cone or pipe. This is because MFL is guided by the principle of volume loss which provides an estimated percentage loss (EPL) and not an actual defect dimension.

The technique itself remains the same but Silverwing through years of research and advanced signal processing have managed to bring MFL into the modern age. Silverwing’s Floormap3Di-R brings to the market two major features for defect classification and analysis allowing for a more accurate inspection with reduced UT prove up; those features are MFLi and Dynamic Cursor (DC).

Floormap3Di-R - MFL Tank Bottom Inspection

MFLi - Magnetic FLux Leakage Intensity

The Floormap introduces a new high contrast plate view based on the intensity of the MFL signal response.

The MFLi defect map uses multiple colour palettes to highlight areas of corrosion, reduce the effect of spurious indications and can be used to classify defect type.

This powerful detection and classification tool can reveal the presence of small diameter pitting, SRB attack, erosion patterns and other features that require further verification.

Floormap3Di-R - MFLi view

MFLi View

DC - Dynamic Cursor

The unique Dynamic Cursor (DC) sizing and verification tool assists in identifying difficult to size defects such as deep pits, bacterial attack and through holes.

The Dynamic Cursor is based on a comparison principle, the expected volume loss and diameter of ‘known depth’ reference defects are compared to inspection surface defects.

The DC works by allowing thescreen cursor to form a ring when moved over an indication which dynamically changes to show the expected diameter of the defect – where inconsistancies are seen re-evaluation may occur.

By using the DC, prove-up inspections such as pit gauging and ultrasonic measurements can be targeted towards the most relevant defects, reducing overall inspection time and improving inspection accuracy.

At a glance, the operator is able to determine which indications are likely to have been sized within expected accuracy levels, and which defects may have been oversized or undersized due to volumes being significantly different to the reference defects.

Floormap3Di-R - Dynamic view

Dynamic Cursor View

Floormap3Di-R - Dynamic view

The result

Silverwing combines these unique features, along with STARS for top and bottom discrimination and by doubling the travel speed to 1m/s has resulted in one the most advanced and fastest tank bottom scanner available today, Floormap3DiM-R.