INTRODUCTION

The storage of dangerous goods in tanks must be executed in a safe way. In order to reduce the economical as well as the environmental risks, a thorough knowledge of the tank condition, and in particular the tank bottom and shells, is of outmost importance.

With the knowledge and inspection experience of De-Tect Unit Inspection, we provide your installation with added quality, cost reduction, business security and improved safety, for both existing and new installations. NDT gives a clear insight into the risk of leakage or other safety critical defects, which increases the integrity and safety within the installation and hence avoids undue operating expenses.

Non-Destructive Testing of Storage Tanks includes several methods of examining materials, components and connections in order to order identify and quantify material defects and degradations.

Tank Bottom Inspection

For the inspection of tank bottoms De-Tect Unit Inspection offers you a quick and above all reliable inspection by combining two techniques: Magnetic Flux Leakage (MFL) and Ultrasonic Testing (UT). By using these two techniques corrosion is detected effectively (MFL) and reliably quantified (UT).

MFL is a detection technique, which detects volumetrically changes. A strong magnet induces a magnetic field in the material. On a corrosion spot, a leakage field will arise. The larger the corrosion the larger the field will be.

After the fast MFL inspection is done the “suspicious” areas of the tank bottom surface will be quantified by the slow but more accurate UT.

Specialized TFT Equipment

Silver Wing Floormap MFL 2000

New generation Tank floor scanner technology driven, not operator dependent

The Floormap 2000 is one of a new generation of Magnetic Flux Leakage systems for the inspection of Bulk Liquid Storage Tank floors.

The system takes advantage of the latest developments in magnet design to give enhanced performance on thicker floor plates (10mm and above).

The ergonomic mechanical design allows the magnet carriage to be ‘broken' from the floor with much less effort than previous designs, despite the increased magnetism.

An on-board computer allows full data acquisition of signals detected by Magnetic Flux Leakage (MFL) in such a way that mapping of defect indications can be carried out in the graphical reporting software either on the on-board computer or on an alternative desktop computer.

The reporting software allows the grouping of defects according to severity in operator definable colour coded band.

• It is standard practice to cross check some areas of pitting detected and sized by the Floormap 2000 by an ultrasonic technique in order to confirm material loss, as a percentage of the plate thickness, and verify the MFL banding.
• Any variation between the MFL banding and the ultrasonic results can be corrected for in the reporting software.
• The Floormap 2000 has been designed to detect under floor conical pit or lake type corrosion represented by an artificial reference hole 40% deep. Under ideal conditions pitting of approximately 20% loss in a 6.0 mm plate can be detected and sized.
• Floor thicknesses over 12.5 mm and up to 20 mm can be inspected by switching to manual mode. It is not possible to quantify or map corrosion in these thicker plates due to the lower flux levels induced in the plate. However it is possible to detect corrosion 50% deep or greater in material up to 15 mm thick and between 60 – 70% deep in materials up to 20 mm thick. A secondary NDT method, normally ultrasonic, is then used to quantify the material loss.

Click Here for Tank Floor Testing Video