ExxonMobil Italy, highly focused on safety and protection of the people working within dangerous areas, were looking for a underground storage tank cleaning technology to completely avoid entering or opening the manhole of a tank. Wolftank Adisa already developed the tank cleaning innovation TCR® 6 & 7. It was the first available technology on the market allowing to wash, clean and degas underground storage tanks without opening the manhole. Even tanks up to 2,5+ m diameter without limits on the tank length and more than 50 cm of solid sludge can be perfectly cleaned.The TCR® 6/7 consists of two different units. It’s completely EX Zone 0 certified and can be operated in any potentially explosive environments while both units fit well into a 4 inch hole. In this case, the filling hole of the underground storage tanks was used. As an addition to the fact that it is the safest tank cleaning method on the market, washing and maintaining of the units is very easy and no lubrification is required.
The TCR® 6 tank cleaning device is the first part in the cleaning process: prewashing the tank. It is operated solely by a pressure pump of 160-230 bar and water flow of min. 60l/min. Furthermore moves by its own water pressure over the entire cylinder length and in combination with the TCR® Tank Cleaning Liquid provides best degreasing and degassing results on the entire storage tank surface.
The second part of the process is the TCR® 7 unit, used for the suction and the cleaning of the lower part of the storage tank. Also this device is designed for water pressure propulsion and removes the solid sludge all over bottom of the cylinder length. No matter if the furthest suction point is the most distant from entry.
All of the requested underground storage tanks were cleaned without opening the manhole and without putting the technicians at risk working in confined spaces. The project was done on time and without any delays. After the cleaning process the storage tanks operated by ExxonMobil were ready for the next steps:
- changing of storage product
- reuse after removing bio-contaminations in the tanks
- safe manhole opening as the tank below is not explosive any more
- tank decommission without manhole opening
The responsible project coordinator for ExxonMobil and Quant Europe, Mr. Calogero Adamo was highly impressed from the technology and stated the following:
“This is the first degassing and cleaning technology I have seen in our Group, which is able to mitigate all predictable safety risks and to keep the process simple enough for field operation. This combination makes it highly attractive also from the economical point of view.”
Overall, more than 500 tanks were treated with this technology for ExxonMobil Italy without any safety issues and with highest customer satisfaction.