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Section 4
MFE Mark III Mapping Scanner General Description
The MFE Mark III Mapping Scanner is specifically designed to efficiently and accurately create a
color-coded map of the metal loss (typically caused by some form of corrosion) in an above
ground storage tank floor. The process for creating this “corrosion map” begins with using the
MFE Studio Software to draw the tank floor layout. Once a “blank floor map” is created, the
next step is to use the MFE Mark III Mapping Scanner to scan the floor for metal loss while
using the MK III Real Time Display Software to record each scan. Since it is important the
scanning speed remains constant and that the distance scanned is accurately measured as the
signals are recorded, an encoder is used in conjunction with a motor unit to propel the mapping
scanner across the tank floor. After each individual scan is complete, it is assigned to its proper
place on the floor map. Once the corrosion map is complete, it can be used to determine the
ideal repair strategy for the tank floor.
It is also important to note that this scanner has the ability to be operated in a Stop-On-Defect
Mode. In this mode, a signal threshold is set on the Real Time Display. Any signal amplitude
greater than the set threshold will trigger an alarm that will “freeze” the signal on the screen
and simultaneously disengage the motor so that the unit stops on top of the defect. The motor
cannot be re-engaged until the alarm is reset. Since the manual scanner requires constant
visual contact from the operator (looking away for even a few seconds during a scan could
result in missed defects), this Stop-On-Defect Mode offers an advantage in that if the operator
looks away for a few seconds then the unit will still stop once it detects a defect. Not only will
the scanner stop moving forward, but the signal will freeze on the screen so the operator can
quickly locate the defect.
The mapping scanner can also be converted into a Manual Scanner. It basically requires the
removal of the Motor Box, Motor Battery Box, and the Control Box. An illustration of the
Manual Scanner can be found in Section 11. In the Manual Scanning Mode, the scanner is
pushed “manually” by the operator. Since the signal response is speed dependant, it is
important to push the scanner at a relatively fast pace. In this mode, the defects can be quickly
located by “rocking” the scanner back and forth over the defect. This mode of operation is
discussed in more detail in Section 11.2.
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