Round tanks for aggressive brine made of Polystone® G black HD

Fast planning, coordination & production

Fast switch-overs are essential for a tank builder. Every customer query involves new requirements: What media are being stored? What static loads apply? Where will the tank stand? How fast does the tank have to reach the customer? And what construction material provides the maximum process reliability and durability under these conditions?

“Every tanks has different requirements,“ said Mario Erdec, Managing Director at Erdec d.o.o. “Close consultation with our customers is always the first step. Only in this way can we take the right decisions during design, and plan and construct tanks that fit perfectly in the given time.“ In the final analysis, reacting quickly to customer requirements means above all one thing for the tank builder: a competitive advantage.

As a developer and manufacturer of tanks for the chemical industry, swimming pools and fish farms, Erdec d.o.o. has established itself as a flexible provider for different market requirements. At the location in Durdevac, Croatia, the company produces round and rectangular tanks according to customer‘s drawings in various dimensions. With this know-how, Erdec is often asked to develop new applications by international clients, too. In such cases, tanks are needed at short notice – for example, for the construction of tanks for storing aggressive brine for Magyar Közút, the biggest public road maintenance company in Hungary.

Choosing the right material

If there is a risk of slippery roads, Magyar Közút‘s road salters are filled with brine and ensure the roads are safe. The brine solution based on sodium chloride (NaCI), calcium chloride (CaCl₂) or urea is mixed and stored in the round tanks. During the planning and construction of the tanks, the experts of Erdec have to take two factors above all into consideration: high resistance to brine and high UV and weathering resistance, since the tanks are deployed outside. Magyar Közút also has to be able to rely on the planned service life of the tanks of several years under these conditions. Therefore, choosing the right material is decisive.

Close coordination

But also the close project coordination plays just as important a role: special mixing and filling technology is installed in the tanks produced by Erdec. For this installation RASCO d.o.o., from Kalinovac, Croatia, is responsible. The company is a world leader in the road service sector and provides a wide range of snow plows, road sweeping and road salting vehicles. RASCO has developed special matching mixing and storage tanks for them. RASCO has the tanks produced at Erdec and then installs the technology itself.

The experts of Erdec visited RASCO on site and familiarised themselves with the requirements over several meetings. Mario Erdec explained, “We coordinated the design within a short period and produced the tanks so that RASCO in turn could quickly supply Magyar Közút. Having a reliable partner at your side is very helpful for projects like this.“

Mixing tanks for liquid salting vehicles: a brine solution is produced with modern technology, based on sodium chloride (NaCI), calcium chloride (CaCl₂) or urea

High chemical resistance: storage tanks for brine solution made of Polystone® G black HD

Polystone® G black HD (PE-HD)

Erdec got advice from Röchling at its location in Planá nad Lužnicí, Czech Republic, in choosing the material. As a long-standing customer, Erdec has for many years been using various Röchling tanks materials made of everything from PE to PP. Röchling recommended Polystone® G black HD (PE-HD) for the application. The material was specially developed to build tanks, providing high resistance to chemical media and exhibiting very good UV and weather resistance. The material withstands the brine solution over the long term and is suitable for the outdoors. It is in use worldwide for the construction of tanks.

Fast production

Röchling supplied the sheets and matching welding rods at short notice. It also performed the dimensioning for the design of the tanks with the software for tank building RITA®. The programm “RITA® 4.0 - Röchling‘s Integrated Tank building Assistant“ developed by Röchling and certified by TÜV Nord calculates free standing, pressureless circular and rectangular tanks under consideration of the current guideline DVS. Erdec coordinated the final design with the RASCO engineers. Thanks to the close cooperation between Erdec, RASCO and Röchling, it was possible to deliver the tanks at short notice.

“We are pleased to have fulfilled the requirements of RASCO. We work at building better tanks every day,“ summed up Mario Erdec. “Having a partner like Röchling at our side, which has great experience in tank building, is a clear competitive advantage. We can react quickly to differing market requirements.“

Project overview