The SDT system allows to notice, through ultra-sounds, the presence of the littlest anomaly of the tank, which is put under depression, permitting in this way to estimate immediately the damage, or the presence of cracks or openings in the tank.
Furthermore, this intervention doesn't require to empty the tank, because it's a depression system which doesn't permit the liquids to get out of eventual holes in the tank.
Finally, we guarantee all the safety and trusting characteristics, because it is a system which respects the laws concerning the control of the tanks. It's easy to follow the stages of realisation on the scheme:

• The tank is disconnected from the loading, aspiration and balance pipes
  
• The aspiration and balance pipes are sealed
  
• We connect a rapid pipe connection at the loading pipe of the tank, into which we introduce the connection cables between the drills and the SDT system
  
• One drill is put above the liquid, the other will be immersed into the product
  
• We'll connect the aspiration pump of the air with vacuum breaking safety-valves at the rapid pipe connection, which is prepared considering the volume and the type of tank which has to be tested.
  
• We'll put the tank under depression and the sensors will detect ultra-sounds produced by holes or cracks
  
• The ultra-sounds are transmitted to the SDT system which emits a sound and shows them on the display of the PC.

Metric control of thickness

This examination is necessary to identify the eventual presence of corrosions and therefore to find out the average thickness of the tank's sheet, which has to be proved by manual examination or by ultra-sounds. This operation allows to know the thickness in different points at the inside of the tank which will be registered on a specific card.

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