1. Applications
  2. General dehumidification solutions
  3. Humidity regulation in gas distribution stations

Humidity regulation in gas distribution stations

External dehumidification systems for drying Ex zones

In gas distribution stations, the pressurized natural gas must be depressurized in order to be fed into the local grid. As a result of the pressure reduction, the pipeline cools down extremely due to the evaporation enthalpy so that the dew point of the ambient air is not exceeded throughout the year. Condensation water and icing occur. In this case, a dehumidification system installed outside the Ex zone provides protection for the building structure, metal parts and electronic equipment. 

The consequences of condensation water and high humidity levels in gas distribution stations are well-known – and expensive: corrosion of pipes, stairways and other metal parts as well as moisture-related failures of the control electronics may entail incalculable costs. If you want to prevent this from the outset, investing in a professional dehumidification system pays off.

The solution: dehumidifiers with recirculation or ventilation mode installed externally

Since for technical reasons there are no dehumidifiers for gas Ex zones, the only solution for gas distribution stations are devices installed outside the potentially explosive area. As regards the operating mode, there are two options:

  1. Dehumidification in recirculation mode (pressure-neutral) in combination with monitoring equipment such as a gas detector. Benefit: slightly lower energy demand.

  2. Dehumidification in ventilation mode (excess pressure). Here, the energy demand is slightly higher, but it is ensured that the required minimum quantity of fresh air is maintained in the station.

The Trotec Group implements dehumidification systems in gas distribution stations with the mobile desiccant dehumidifiers of the TTR series marked with "D". Owing to the simple air quantity setting option "Duoventic", they can be used for both scenarios. TTR 400 D and TTR 500 D operate on the TTR Trisorp Dual principle with two separate air flows and separate fans for each circuit. In addition to the ventilation mode with dried fresh air from outside, this also enables the recirculation mode. This way it can be guaranteed that the gas distribution station is kept continuously dry.

Industrial services: safety in the Ex zone due to trial operation

Thanks to the Trotec industrial services team the implementation of a safe dehumidification concept around the Ex zone of the gas distribution station is ensured: If necessary, we will test the functioning of our solution with mobile devices and only install the stationary systems after a successful trial phase. Thus, not only the humidity but also your budget will be kept under control as there will be no unexpected retrofits.

Further solutions


Upon request, we also produce customized desiccant dehumidifiers as special models

Upon request, we will readily produce tailor-made desiccant dehumidifiers as special models “made in Germany” perfectly geared to your needs, e.g.:

  • TTR industrial desiccant dehumidifiers with hygienic design
  • TTR industrial desiccant dehumidifiers for PWIS-free dry air
  • TTR industrial desiccant dehumidifiers with extremely low dew point

Makes use of the possibility of having special models with tailored components for your individual needs planned, designed and manufactured in close consultation with our specialists.
Click here to find out more ...

Further application examples for air dehumidification

  • Environmental simulation climate chamber

    In climatic chambers and wind tunnels three factors need to be simulated at the best possible rate: air temperature, wind strength and humidity. For the latter, the automotive industry needs dehumidifiers, which also perform well at dew points below 0°C, as well as high-performance desiccant dehumidifiers.

    Additional information
  • Dehumidifying & air cleaning for coating

    There are three parameters to be controlled when coating car components: room temperature, humidity and the dust content in the air. In addition to dehumidifiers and heating devices we also provide sustainable air cleaners with special volumetric flow regulation for this production stage in the automotive industry.

    Additional information
  • Dehumidification in tents

    When preparing a tent or another type of temporary accommodation, good room conditions are essential. This applies particularly to makeshift dwellings accommodating large numbers of people. This can be tent cities or container villages for asylum seekers, tent camps for youth groups, tents used as a place to sleep at large events, and also containers serving as a temporary home for seasonal...

    Additional information
  • Drying hygroscopic bulk material

    Varying and too high humidity values can ruin the pourability of powders and granules – and thus entail high consequential costs. In order for hygroscopic bulk material not to go lumpy nor to block hauling paths, the entire air in the chemical and pharmaceutical production must be pre-dried. Using adsorption dryers of the TTR series that's no problem.

    Additional information
  • Drying after silo cleaning

    After the cleaning of storage containers and silos you have to count on them to be fully dried for new bulk material to be protected against moisture from the beginning. And since drying can be effected in a quick and economical manner, we advise decision makers from the chemical and pharmaceutical industry to consider our high-performance dryers of the TTR series.

    Additional information
  • Drying pellets

    Who turns his back on proper air conditioning for production and storage facilities risks serious damage to the product. This is also true for the manufacturing of pellets. The biofuel is particularly susceptible to excessive humidity values. For the untreated raw wood withdraws the humidity from the air and absorbs it. With devastating consequences for both the customer and the manufacturer:...

    Additional information
  • Dehumidification in hotels

    A suitable room climate is a prerequisite for the well-being of hotel guests. If the air in the room is too warm or humid, it appears to be stale and muggy. Often damages appear at the building structure and interior within a short period of time. Wallpaper will be dotted with mould stains, curtains and clothes as well as linen become damp and musty and – if it comes to the worst – mildew runs...

    Additional information
  • Dehumidification in indoor ice-skating rinks

    Due to the difference in temperature between air and the icy surface, condensation inevitably forms in every ice rink – especially when humid air keeps flowing in from outside through the refrigeration system. The solution against dripping water on the ice and against damage to property constitutes a dehumidifier. It prevents condensation in the offing.

    Additional information
  • Drying compressed air

    The most frequent causes for a production stop are too much water vapour in the machines and installations, and corrosion inside the pipelines. Therefore, too humid compressed air should be avoided by all means. An effective option is the use of high-performance dehumidifiers. The answer to the question of how dry the compressed air has to be in order to guarantee optimum production conditions and...

    Additional information
  • Mobile devices for sanitary, heating and ventilation engineers

    Many sanitary, heating and ventilation engineers use the mobile devices from the Trotec Group. Here sanitary, heating and ventilation engineers find everything they regularly need for their daily business to bridge the downtimes of stationary installations – all from a single source: mobile heating devices and central heating units, mobile air handling units or cooling systems right down to...

    Additional information
  • Dehumidification after restoration work

    With an extensive reconstruction flats and houses are being polished up so as to quickly attract potential buyers. Estate agents rely on this service for a better marketability. But home builders also very much appreciate it when their own four walls are in immaculate condition before they move in. The future inhabitants’ thrill of anticipation increases along with the progress in construction...

    Additional information
  • Dehumidification in cinema halls

    A cinema audience essentially wants one thing: to unwind and get away from the daily routine by succumbing to a world of fiction. Loud voices and unwelcome sources of light can be just as annoying as an inappropriately tempered auditorium and a poor air quality. Precisely because it is difficult to properly ventilate cinema facilities, they are usually equipped with powerful air-conditioning...

    Additional information
  • Humidity regulation in gas turbine power stations

    Gas turbine power stations significantly contribute to the coverage of short-term peak loads. A sophisticated humidity regulation helps to prevent the breakdown of individual gas turbines due to corrosion and problems with the electronics.

    Additional information
  • Offshore: Preventing corrosion

    Corrosion of metal parts in the nacelle of a wind turbine or in the tower itself as well as electrical failure are among the most typical humidity damages in offshore surroundings. They cause substantial additional costs as they increase the expense for maintenance and repair and may lead to operational downtimes. Plus, they reduce the turbine's life. In this case, strategically positioned...

    Additional information
  • Dehumidification in bridges

    Inside bridges, steal beams, electric lines and technical rooms are subject to high humidity. For decades, it has now proven an efficient alternative to high-maintenance anti-rust paint to instead use dehumidifiers to keep bridges dry on the inside. Trotec desiccant dehumidifier of different capacities are used for dehumidification.

    Additional information