QUESTIONS & ANSWERS

  

Adsorber as an alternative to nitrogen

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Nitrogen blanketing of containers is preferable when the purpose is to shield the substance from oxygen to prevent oxidation. However, if the main purpose is to protect the substance from humidity, an adsorber is a much better choice. It is easier to handle and cheaper to use.

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Can an adsorber be regenerated by compressed air?

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After an adsorber has been completely loaded, the silica gel is no longer absorbent and must be regenerated or replaced. This is also possible through the compressed air in the company. However, it requires a long time and causes high costs. Therefore it is not reasonable.

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At what temperature and humidity should an adsorber be used?

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The use of an adsorber is a sensible, effective and inexpensive measure on many plants. However, there are conditions where the use is not recommended. For example, an air humidity of less than 50-60% rH and a temperature higher than 80°C are environmental conditions that speak against the use.

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How is the correct air pendulum volume determined?

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To properly select an adsorber for use on a hydraulic tank, the air flow rate is an important value. The air flowing through the adsorber must be dehumidified by the desiccant. In this process, the quantity and speed have an effect on the efficiency. But how is this air flow determined? What approaches are there and how accurate are they?

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How do I remove liquid water from a tank?

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If a hydraulic power unit, diesel tank or other systems are operated without a silica gel filter, water can quickly become trapped in the tank due to condensation. After the substance reaches the absorption capacity, the water will settle at the bottom of the tank and cause damage. How can this water be removed quickly and cheaply? Is there a solution for this that can be used immediately?

 


What is the correct air flow rate for an adsorber?

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Which air flow rate or volume flow is correct for the successful use of an aeration dryer and how is it determined. In our current Question of the Month we pursue this question and give you the answer.

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Can an adsorber be used on a compressor?

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In principle, it is possible to install an adsorber to dry the supply air on a compressor. However, it is absolutely not recommended. Due to the large amount of air that a compressor draws in, an average-sized adsorber would be loaded with 3kg of silica gel within a very short time and would require maintenance. This enormous maintenance effort is out of proportion to the benefit. It is more advantageous to insert an adsorber in the compressed air line after the compressor, since the adsorption dryer installed on the compressor separates the large amount of water.

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How much does an adsorber dry the air?

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In case of high humidity in the environment from 70% rH, the use of a silica gel filter is recommended. This dries the air drawn into the system to prevent contamination of the substance it contains. But how efficient is an adsorber? What residual moisture and dew points can be achieved? Both values depend on the saturation state of the adsorber and are at 2% rH & -35°C at the beginning. In the course of the product life cycle, these values increase to 30% rH & 0°C.

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Why does an adsorber turn purple?

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There are substances that are aerated and turn the silica gel orange purple on contact. In principle, orange gel turns a dark green or white when it comes into contact with water. However, amines and AdBlue, among others, which evaporate from a tank and enter the adsorber, can discolor the silica gel purple. This silica gel is no longer able to absorb water and must be replaced.

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What pressure does an adsorber build up and why?

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Functionality Adsorber

All original GIEBEL Adsorbers® consist of harmless and reusable materials. This includes among others Acrylic glass, aluminium, galvanized steel, polyamide (PA), polyoxymethylene (POM), NBR, FKM, EPDM, activated carbon, silica gel orange.

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When is silica gel or activated carbon used in the adsorber?

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Whether the hydrophilic silica gel (water-attracting) or the hydrophobic adsorbent activated carbon (water-avoiding) is used depends on the objective of the application. If air humidity is to be prevented from entering the system, a silica gel filter is used. On the other hand, if the environment is to be protected from oil aerosols or other pollutants, an activated carbon filter must be used.

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Can an adsorber be mounted from top to bottom?

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An aeration dryer is always mounted vertically. The connection is located at the bottom of the system. This has advantages, because due to the constructional design the air inlet openings are on the same side and thus increase the IP protection. However, if an adsorber has to be mounted from top to bottom, this is possible up to a certain size. It is better to use the specially designed TB-RV series.

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Can silica gel adsorb liquid water?

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The question is often asked whether silica gel can absorb water? Yes, as long as it is present as humidity in the air or as the highest mist. Liquid water cannot be adsorbed by narrow-pored silica gel. Special silica gels or other adsorbents are used for this purpose. Liquid water produces such a high energy release that the silica gel grain is destroyed and breaks. This is visible in the adsorber as dust.

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Can silica gel be regenerated in the microwave?

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Silica gel is regenerable and can be reused very often - this is a major advantage of this desiccant and has contributed to its widespread use. But how is the silica gel dried in practical handling? Simple and effective is drying in a standard household oven at 120°C. But can silica gel also be regenerated in the microwave? Yes, but only under certain conditions.

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Is oil in a tank dried by an adsorber?

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If the oil in a hydraulic tank is already loaded with water, a ventilation dryer can help to a certain extent. On the one hand, no new moisture gets into the oil, on the other hand, the air inside the tank is dried and thus also the oil. However, this happens only very slowly and serves to solve the problem of oil drying.

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Why can an adsorber be loaded very quickly?

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If a ventilation dryer becomes saturated very quickly, this can have several causes. In this video we will deal with this. The most common reason is a high volume flow to be dried and an adsorber selected too small. On the other hand, it is possible that the moisture comes from the system and the adsorber is loaded from both sides.

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Combine nitrogen blanketing with adsorber?

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The use of a tank air dryer in combination with a blanket of an inert gas, such as nitrogen, is not necessary. The reason is the function of both approaches. The nitrogen blanketing creates a continuous overpressure. On the other hand, the adsorber needs a regular negative pressure to dry the sucked in air. This effect is explained in the following video.

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How many plugs must I pull out during assembly?

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When mounting an adsorber without valves, the openings are closed with protective plugs. In this way, the adsorber can be stored for a long time without loading. However, the plugs must be removed during commissioning. And there is always the question, how many? In systems with a slow air flow only 1-2 plugs, whereas in systems with a high air flow all 4 plugs.

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Do I use an adsorber with or without valves?

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We are often asked whether an adsorber should be used with or without valves. This decision depends on the plant and the application. It is important whether a long maintenance interval or a favourable purchase price has priority. Long maintenance intervals require the protection of the desiccant by valves.

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WHY DOES THE SILICA GEL IN THE ADSORBER TURN BROWNISH?

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In most cases silica gel orange-green is used when a breathing filter is used. In practice, the silica gel does not always turn green, but rather brown. We explain the reasons for this in our blog post.

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What is the maintenance interval of an adsorber?

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Anyone who uses an aeration dryer has already made the right decision. However, the interval until the next maintenance is individual. We explain the reasons for this in this article.

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