Out of sight, out of mind.

Why guess when you can actually see using new video technology?

by: Peter Sutherland

In 2016, the EPA conducted a study to investigate the corrosion effects of storing ultra low sulphur diesel in underground tanks.

They conducted random internal video inspection of 46 tanks and identified that 83 per cent of steel tanks inspected showed significant corrosion.

Another application of video inspection is during the tank cleaning process to verify that all areas of the tank have been cleaned. It is possible to actually watch the cleaning process while it is being conducted to give feedback and assist the cleaning technician to get all areas of the tank bottom.

Water leaking through the crack in fiberglass

This picture shows a large crack in the side of a single wall fiberglass tank with water entering through the crack.

Fiberglass

This is a picture of a 25-year-old DW Fibreglass tank with a brine filled annular space in Florida. When water was poured into the annular space with the tank empty we were able to see with the video camera that there were several cracks and water was seen entering the tank through three of these cracks. It was also noted that there was a section of the bottom of the tank that was deflected inward.

Cracked steel wall

This picture shows a single walled steel tank that was coated with an epoxy liner. The liner is cracked at several points and delaminated from the tank.

Crack in the fiberglass

This picture shows a much smaller and more subtle crack in the wall of a single walled fibreglass tank. The tank had failed a precision leak test and the subsequent internal video inspection located some small cracking on the tank wall.

Severe corrosion on the top half of this single walled steel tank.

corrosion of steel tank

This picture shows severe corrosion and tuberculation on the top of a single walled steel tank in Texas.