Tubular Heat Exchangers

The VARITUBEŽ tubular heat exchanger is specifically designed for the thermal

treatment of low to high-viscosity products as well as products containing particles,
pulp and fibres.

The VARITUBEŽ system is mainly used in heating, cooling and aseptic systems.

Application-oriented technology
According to the required production capacity and the physical properties of the product, the most appropriate design can be selected from numerous versions of our VARITUBEŽ heat exchangers. Depending on the area of application, customised designs can also be developed and installed. Our VARITUBEŽ range is used for many products that need to be heated, cooled, pasteurised and UHT treated.

Technical concept


The VARITUBEŽ tubular heat exchanger is a straighttube heat exchanger with one or more inner tubes situated in a shell. The inner tubes can either be plain or corrugated. Corrugation and the optimised product/media volume ratio increases the thermal efficiency of our heat exchangers. Their modular design allows for easy installation and easy extensions or future modifications. VARITUBEŽ modules are TÜV-approved and manufactured from 1.4571 (AISI 316 Ti) material. A sanitary O-ring sealing system and product flow paths without "dead zones", ensure highest production reliability and product quality.


Available type range:


VARITUBEŽ S – Singletube

for indirect heat treatment of products containing pieces. Product recovery is possible using pigging technology. Tubular heat exchanger in which the product flows in one straight inner tube, while a heat carrying medium flows around it in an external shell. The inner tube is mounted in a "floating" manner to compensate for the different thermal expansions caused by high temperature differences between shell and inner tube.


VARITUBEŽ M – Multitube

with indirect heat exchange which is also suitable for products containing particles of approx. 18 mm diameter. The product flows in several straight inner tubes while a heat carrying medium flows around it in a shell. The inner tube is mounted in a "floating" manner to compensate for the different thermal expansions caused by high temperature differences between shell and inner tube.



Further characteristics of VARITUBEŽ S and M

Modular design with 2 or 4 modules
Removal inner bundle
Plain or corrugated inner tubes
Lengths of 3 or 6 m
VARITUBEŽ P –
used for the direct product/product heat recovery of smooth, fibre-contained and viscous products. In this tubular heat exchanger the product is guided through several straight inner tubes surrounded by the same product, which flows in a counter-current direction in the shell. The inner tubes are mounted in a "floating" manner and can be removed as a complete bundle for inspecting the product flow path.


VARITUBEŽ SK –

specially designed flow device keeps the heat exchanger free from deposits – processes products containing fibres with a length of up to 30 mm. This heat exchanger is available as a M version (VARITUBEŽ M-SK) and as a P version (VARITUBEŽ P-SK).


Function principle

Flow devices installed on the bottom plate provide additional, jet-type acceleration of the product in the reducer at the connection bend. The flow breaks at the outside of the displacement device and generates a transverse flow directly in front of the tube bottom plate. The transverse flow ensures that no fibres collect on the tube bottom plate. Much longer production cycles are thus achieved.


VARITUBEŽ HS – Multitube

with indirect heat exchange, suitable mainly for hot water generation and heating of CIP media for high thermal performance and volume flow rates of up to 60 m3/h. This tubular heat exchanger features product guiding in several inner tubes which are bent around 180°. The heat carrying medium flows in the surrounding shell. This design allows for compensation of the different thermal expansions between inner bundle and shell, which could be caused by high temperature differences.


VARITUBEŽ E – Multitube

with indirect heat exchange, suitable mainly for hot water generation and heating of CIP media for medium thermal outputs and volume flow rates of up to 165 m3/h. The tubular heat exchanger guides the product through several straight inner pipes surrounded by a carrier medium in a shell. The inner tube is mounted in a "floating" manner to compensate for the different thermal expansions caused by high temperature differences between shell and inner tube.