We use state-of-the-art technologies for the production of heat exchangers

 

Key production technologies

Production technologies are very important to us because they contribute more than 80% to the production of a welded heat exchanger. The technologies arose from several years of practice and development. We have adapted them to our needs and they represent our valuable know-how.

With the help of technology, we minimize errors - each exchanger has the same welding parameters and the same weld quality. We use special welding machines that meet the most demanding criteria for welding heat transfer plates. Each body is welded in the same maximum quality.

The quality of our products in addition to the use of cutting-edge technology is also ensured by the professionalism and skill of our permanent employees.

WELDING IS PERFORMED BY THE TIG METHOD WITHOUT THE USE OF ADDITIONAL MATERIAL AND THANKS TO THIS EXCHANGER  MEETS THE STRICTEST TESTING CRITERIA.

Welding of plates

The heat exchanger body itself contains worktop whichare welded to each other around the outer circumference and the inner inlet holes by the TIG method. The heat exchanger body usually has four necks which are also TIG-welded to the worktop bundle.

Heat exchanger casing

The welded heat exchanger body is then compressed between the covers, the design of which comes either in a fully welded form (picture at the bottom right) or in covers with screws (picture at the bottom left). These covers are designed to meet the operating pressure and their material is usually made of coated structural steel or stainless steel with glass beads surface treatment.  

We do our best for achieve top quality and reliability which is why every heat exchanger is subjected to a leak and pressure test.

Heat exchanger leak test

Plates and their thermal efficiency

Heat exchanger plates are basic modular elements and play a major role in the excellent thermodynamic properties of  Standard Line and T-Heat Line. Thanks to the optimal corrugation of the plates, it is possible to achieve a heat transfer coefficient of up to 7000W/m2K.

By arranging the plates, two separate spaces are created between which heat transfer takes place. The functional surface of the plates can be electrochemically polished according to the customer's needs which together with the highly turbulent flow leads to minimizing of the formation of deposits and contamination (clogging effect). The internal arrangement of the media flow can be optimized with regard to the required intensity of heat transfer maximum reduction of pressure loss or according to the special requirements of the cooling or heating process.  

The intensity of heat transfer and the pressure loss of the heat exchanger depend among other things on the angle of the bending of the wave and the resulting turbulent flow. Different types of plates are used in the exchangers namely plates with a larger angle of the bending of the wave and plates with a smaller wave pitch angle. Very often the combination of both is used.

Production of own plates

In addition to welding machines, we also have our own press shop. We manufacture and press our own plates which we use in the production of welded heat exchangers. Heat exchange plates, their shapes, sizes or corrugations are the result of years of development, experience and especially practice. Our plates are among the TOP products on the market with regard to the heat exchange surface and the highest possible heat transfer supported by the lowest pressure loss.  

Thanks to the different sizes of the plates, their number, depth and angle of the bending there are various types of applications. Heat exchangers can be made with one-sided or two-sided connection.

According to the customer's needs, the exchanger can be fitted with two or even more necks in front and back. Multi-neck heat exchangers are mainly used for deaeration, degassing or as additional media supply/discharge, etc. If necessary the heat exchanger produced by our company can be connected in parallel or in series. For demanding applications such as a large temperature gradient, high neck loads, the use of different vapours, etc. we use expansion joints. This solution largely eliminates the adverse effects of forces in the exchanger together with the damping of pressure shocks transmitted from the connected piping or the flow of media which directly affects the overall life span of the heat exchanger.  

Working, heat exchange plates of the heat exchanger with a thickness of 0.6 mm are made of different types of alloys and steels always according to individual types of media flowing inside the heat exchanger. As standard, we supply plates from the most commonly used austenitic stainless steel of quality 1.4404 (AISI 361L).

Currently, we can offer material from:

• austenitic steel 1.4404, 1.4571

• superaustenitic steel 1.4539 or 1.4547

• nickel alloys 2.4819 (Hastelloy)

• titanium alloys 3.7025 or alloys of tantalum

• other materials available upon customer's request

Regular investments in technology

Because technology is our top priority, we make investments in it annually. We are constantly modernizing our technology in order to streamline the production process and improve the quality of our production. In the last year, we have invested several million in the modernization of presses. In addition to presses and welding machines, we have our own machining, CNC equipment, CNC plasma and other technologies.