Case Study Petrol Station Groundwater Monitoring

Petrol Station Groundwater Monitoring in Spain

The Scope of the Project

Petrol station had a leak contaminating groundwater. After repairing the leak and remediating the site, an on-line monitoring system was put in place to make continuous follow up of the site in case new contamination appeared.

The Challenge

Petrol station is in a high dense city and contamination affected underground a parking and buildings, threatening human health. After repair and restoration, it was important to make sure a “reboot” of the contamination did not appear. Bi-monthly manual monitoring was initially requested by regulators. After showing our wireless monitoring system, regulators decided to accept this method.

Liquid based leak detection installation
Liquid based leak detection installation

The Solution

The first step was to make sure remediation was completed and no hydrocarbons were present in the groundwater. Three wells were selected for control: 2 were 2” and one was 4”. Sensors were installed in the wells and covered with the standard metal lid of the chamber. After, repeaters were installed as close as possible to their sensors ensuring a good radiofrequency communication. Finally, the gateway was in
place and checked the system worked properly. Total installation took 1,5 hours.

The Outcome

Case Study Petrol Station Groundwater Monitoring
Case Study Petrol Station Groundwater Monitoring

Three weeks after the implementation of the system alarm was triggered in “P3” and “P1” showing initial reboot and mobilization of the old spill. This allowed for quick intervention and recovery measurements were put in place. After sensors were put back in place to keep monitoring of any new alert. Couple of times alarm were triggered and corrective actions were taken following the introduction of sensors again.
Our sensors saved time and money allowing for a very quick detection of a reboot and correction activities could be taking at the beginning of the episode.
Sensor in well “P11” still kept monitoring in case a reboot also occurs in that area. System has been working for over 3 years without alarm in this well.

For more information contact us or read here.

TCR 6-7 applied through 4 inch flange

TCR® 6/7 – Tank cleaning without opening the manhole

The Scope of the Project

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 Challenge

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.

TCR 6-7 applied through 4 inch flange
TCR 6/7 applied through 4 inch flange
Tank Cleaning Robot TCR6 Side
TCR 6 Unit
TCR 7 Unit
TCR 7 Unit

The Solution

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 Outcome

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.

TCR 15 inserting into tank

Fuel Tank Cleaning with TCR® 15

The Scope of the Project

The client: Repsol Italy

The scope of the project was to remove all residuals and sludge from the underground fuel storage tanks while keeping the gas station partially operational. Furthermore, the customer, highly focused on safety, requested to reduce the risk for technicians by using our remote underground storage tank cleaning robot TCR® 15. The requested result was to provide a safe and environmentally friendly procedure to reach degreased and clean tank surfaces.

The Challenge

This request was the pilot project for the underground tank washing robot TCR® 15 and as every first project, several new difficulties could come up. Furthermore, it was for the customers importance to keep the gas station partially operational so the organization and planning was of utmost importance to execute this task hassle-free while keeping the project completion time as low as possible.

TCR 15 inserting into tank
TCR 15 inserting into tank

The Solution

Together with the client Wolftank Adisa technicians developed a detailed tank operation plan with a time schedule witch they focused on. Therefore, the technicians could focus on the final result. Giving the fact that the TCR® 15 is completely ATEX Zone 0 certified and has a mounted camera connected to a remote display, the operators were able to follow the fuel tank washing process live within a safe area and if necessary, immediately optimize the cleaning process.

Fuel Tank Cleaning Robot TCR 15
Fuel Tank Cleaning Robot TCR 15

The Outcome

The standard tank cleaning robot with his spraying nozzles and rotating arm removed any sludge from the tank wall with up to 200 bar water pressure. The installed suction unit, connected to a standard tank cleaning truck, immediately removed the loosen sludge from the bottom of the fuel tank, all fully remotely and within one single process.

Since the Wolftank Adisa technicians were trained properly, all 5 fuel tanks were successfully degreased at a glance. In the end more than ready to get to get operational again. The customer and technicians were satisfied with the pilot project outcome: Remote cleaned underground fuel storage with no man entry and maximum safety.

The pilot project was a big success for Wolftank Adisa and their innovative underground fuel tank cleaning robot TCR® 15.

Read more about the TCR® 15 or get in contact with us for further information.

Ringwall restored by Wolftank Adisa

Ring wall rehabilitation in Italy

The Scope of the Project

Ring walls are crucial areas of an aboveground storage tank, exposed to weathering such as high UV radiation. This area carries the weight of the tank itself including the product inside too. Beside the above-mentioned heavy load, this ring is exposed to intense movements caused by weather conditions and up- and unloading of the product. The proper protection and rehabilitation of the ring wall is therefore important to warranty the integrity of the tank.

Untreated Ring Wall
Ringwall Before Wolftank Adisa Intervention

Untreated Ring Wall
Ringwall Before Wolftank Adisa Intervention

The Challenge

The customer was a private refinery on the North East coast of Italy which has been operating since late 50’s in the heavy oil crude refining sector. Always committed to the implementation of a policy attentive to the strengthening and improvement of the plant, the company has consolidated its presence on the national market and has significantly increased exports to various foreign markets. Therefore, the challenge of the customer is to maintain the integrity of rather dated assets in an environment with high level of corrosion due to the proximity of the sea.

The Solution

Because the ring wall of the tank showed both heavy signs of wear in the concrete substrate and of corrosion in the metal one, we applied a solution that would repair both in a homogeneous and weather-resistant way. On a sand blasted treated surface we therefore applied a series of different layers as shown in the picture.

Advantages of our ring wall coating solution:

  • Excellent anti-corrosion barrier which helps to extend the life of the tank
  • Two-component primer with high adhesive power on different surfaces
  • VOC-free protective coating with high elasticity
  • Final layer with high electrical conductivity

The Outcome

Refurbished Ring Wall by Wolftank Adisa
Restored Ringwall

The rehabilitation of this ring wall was judged by the customer beyond expectations both from the point of view of the result and of the operations that were conducted quickly and flawlessly. As a result, more interventions on ring walls have been planned to protect other tanks, in Italy but also in other countries.

The Applied Water Tank Lining

Drinking water tank lining in Spain

The Scope of the Project

There are lot of steel storage tanks for drinking water all over the world which must be protected in order to save the asset, the valuable drinking water. As the water is highly corrosive for steel vessels the steel surface must be separated from the stored liquid. The most effective way to prevent the contact between the two materials is a drinking water tank lining. Wolftank Adisa has its own lining system for drinking water storage tanks irrespective of the size and shape of the vessel.

The Challenge

The Applied Water Tank Lining
The applied water tank lining

The biggest challenge was that our Spanish partner AlterEco has never applied this lining system in Spain. This was a completely new solution for our partner and the market. On the other hand, AlterEco has already collected enough experiences with Wolftank owned systems such as Duplo® and other single and double wall applications. They have the experienced manpower and the proper equipment for such a lining work. They got to know the specifications of the products and application steps and they could smoothly execute the project.

The Solution

Manhole View Of Water Tank Lined
Manhole view of the lined water tank

The first step to ensure the accurate adhesion between the subsurface and the coating is the surface preparation. For this project we used instead of the conventional surface preparation method such as grid-blasting or jet-blasting our rust converter agent which must be applied after the mechanical removal of the rust. Usage of this methodology the implementer saves not only time because the application takes only a few hours and the reaction time of agent is 2-3 hours but money as well because it is not required the costly blasting equipment, the grid and there is no any dust or residuals which must be removed which also costs time and money.

Subsequently the coating must be applied. The resin which is used for drinking water is 2-component epoxy-based resin that can be applied with airless spraying machine or it can also be rolled. In this case the lining was rolled in two layers.

The Outcome

The drinking water tank lining can be applied all over the world. The system has many advantages especially the short downtime because of the easy and fast application.

The expected extend of the lifetime is up to 10 years.