Viledon App
Freudenberg Filtration Technologies

Water repellent with drainage effect

Viledon hydroMaxx coalescer prefilters provide gas turbines and compressors with optimal protection against moisture, salt and corrosion

Even something that has been thoroughly tried and tested can be further developed and improved. This is demonstrated by the new Viledon hydroMaxx coalescer pre-filter for gas turbines and compressors from Freudenberg Filtration Technologies. Like its Viledon Compact F 45 R predecessor, the reversed pocket filter impresses with its excellent droplet separation capacity thanks to the drainage effect on the front of the filter. This new generation of filters boasts additional features as well. They are easier to handle and install while also being lighter and more flexible to ensure operational reliability.

One of the core competencies of Freudenberg Filtration Technologies is the ability to combine different filter types and classes into a customized total system, tailored to meet specific environmental conditions and customer requirements. Gas turbines at coastal locations or in tropical and subtropical regions, as well as on offshore platforms, absorb water droplets and often salt as well with their combustion air. In particular, the penetration of salt-containing water leads to reduced compressor efficiency and corrosion on the blades as well as in the hot gas area of the power turbine. The latter occurs especially when sulfur compounds from the fuel react with the salt’s sodium ion. Effective protection of the turbomachine against penetration of water and salt can be achieved if the installed fine or EPA filter is kept dry.

Available in a range of geometries, Viledon coalescer prefilters prevent the ingress of water and salt. They increase operational reliability and plant availability, reduce maintenance costs and protect against unscheduled downtime. The new top model among coalescer filters is the reverse pocket filter Viledon hydroMaxx. This filter does an excellent job of keeping the downstream filter stages dry and significantly reduces the intake of salt particles and hydrocarbons. It also avoids the undesirable pressure difference increase that is frequently caused by saturated fine and EPA filters.

The reverse media concept

Special features of the Viledon hydroMaxx product line include Freudenberg’s self-produced permanently water-repellent filter medium, from which water drops simply roll off, and the reverse-media concept. This means that the individual filter pockets face forward with the closed side facing in the direction of airflow.

This enables an optimum drainage effect with additional deposition of dust particles. Unlike a traditional pocket filter, water is not retained by the filter but forms into droplets and rolls off, washing away the dust at the same time. This unique reverse-mounting technique for the prefilter ensures that water and dust are spatially removed well before reaching the downstream fine filter with a good “safety distance”.A further advantage of the Viledon hydroMaxx product line is the new self-supporting integrated plastic cage system that gives the filter a high degree of structural stability and low weight. The new filter can be easily installed in a few simple steps, facilitating filter changeover. In addition, top-quality construction ensures maximum functional reliability. Rather than being clamped in some way, each filter bag is foamed into a PUR front frame and completely welded to eliminate leakage.

Various 2-in1 solutions

The new modular clip-on system is a true innovation in terms of handling and flexibility. By means of a simple plug-in technique, Viledon hydroMaxx prefilters can be connected to the downstream intermediate or end filter stages to form a single unit. In this simple and efficient way, a variety of space-saving 2-in1 solutions can be implemented as required. There is no need to invest in an additional filter wall.

Finally, the Viledon hydroMaxx prefilters have already been evaluated according to the new ISO 16890 test standard, which replaces the previous EN 779. Their good separation efficiency means that they achieve an ISO ePM10 50% rating.