FLOORMAP-L and FLOORMAP are the inspection software packages for the ISONIC workstation providing the express ultrasonic inspection and mapping of the pitting (corrosion) in the large metallic plates either flat or curved. The ultrasonic coverage of the whole plate is provided without scanning above the whole surface of the plate. The typical objects under test are:
  • Annular plates of the storage tank - inspection from outside
  • Shell and walls of the storage tank - inspection from outside
  • Floor plates of the storage tank - inspection from inside
  • Inaccessible pipe walls – inspection from outside (for example the pipe walls above the concrete support, coated pipes, etc.)
  • Walls of the underground storage tanks – inspection from outside
The specially designed probe emits the ultrasonic beam having the width, duration of the wave package and basic wavelength comparable with the thickness of the plate. The components of the emitted wave package interfere between the plate's surfaces. The probe’s dead zone is located under the fillet weld, so the probable echoes from the welding area are significantly suppressed. After passing through the fillet weld area the ultrasonic wave package saturates the volume of the plate while propagating. Pitting and corrosion damage if any returns an echo picked up by the probe.

The echo height correlates with the depth and surface dimensions of the pitting (corrosion damage), so the degree of the damage may be evaluated through the referring to the amplitude of the received signal.

The defects located on both surfaces of the plate may be detected, however it's impossible to distinguish between echoes obtained from the defects belonging to the different surfaces

FLOORMAP-L inspection software package provides the pitting (corrosion damage) mapping of the plate through the linear scanning along the plate edge, for example the lip of annular plate, with capturing, processing and storing of all received ultrasonic signals (A-Scans). The mapping procedure may be either time-based (timed) or encoded (true-to-scale). The simplest one axis incremental encoder is required for the encoded imaging



FLOORMAP inspection software package provides the pitting (corrosion damage) mapping of the plate through the:

  • continuous linear scanning with the probe along the plate edge / reservoir shell
  • probe swiveling near the shell at one or few points in front of mapping area
  • combination between linear scanning and swiveling


The true-to-scale map is created using the capturing, processing and storing of all received ultrasonic signals in correlation with the probe position and swiveling angle, which are encoded non-mechanically using the typical ISONIC airborne ultrasound technique





The piece of annular plate with the real and artificial defects is shown below:


To view movies illustrating the inspection of this sample click on the appropriate link (Windows Media 9 Codec is required in order to view the movies):