Should dryer go before or after compressor?

A common query from one of our client this week pertains to the ideal location for air dryers within a compressed air system. Currently, they have positioned their air dryer before the receiver, which has resulted in moisture-related issues in their pneumatic machinery. Traditionally, the preferred placement for air dryers in a compressed air system is immediately after the air compressor and before the receiver. However, is this arrangement truly optimal for the overall performance of the system?

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Air dryers play a critical role in efficiently removing moisture from the compressed air supply. Typically, in a compressed air system, around 60-75% of the moisture is eliminated at the aftercooler stage. While this level of moisture removal suffices for many plant air applications such as cleaning and atomization, pneumatic and instrumentation tasks demand low-moisture air, necessitating the use of different types of air dryers.

Placing an air dryer before the receiver carries several disadvantages:

Moisture that naturally condenses in the receiver may not be effectively removed, leading to higher moisture levels downstream in the system, potentially causing issues with equipment and processes.

Dryers operate continuously regardless of whether the compressor is running or shut off.

The increased workload on the dryer due to its placement before the receiver can result in more frequent maintenance and a shorter lifespan for the dryer.

These points provide a rationale for positioning the air dryer after the receiver in a compressed air system. However, this arrangement also has certain drawbacks, such as the potential for receiver corrosion. Nevertheless, because the benefits generally outweigh these drawbacks, they effectively address and mitigate the associated disadvantages.

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It&#;s a question commonly asked when an end user starts to design their compressed air station - should the dryer be installed before or after the air receiver? Dryer installation downstream of (after) the air receiver has always been the traditional method, with dryer installation upstream of (before) the air receiver being the more modern approach. Nevertheless, each method has its own merits and drawbacks and each may be better suited to certain applications.

So what are the advantages of installing a dryer downstream of (after) the air receiver?

And, what are the advantages of installing a dryer upstream of (before) the air receiver?

Conclusion 

Ultimately the decision of installing the dryer before or after the air receiver will depend on the application. For example, if you wanted &#;wet-untreated air&#; for an application - downstream installation would be the better option as you could take it out of the air receiver before the dryer. Therefore the dryer could be smaller (which reduces the capital equipment outlay and associated energy costs). 

An example where upstream installation may be more beneficial would be where you wanted to store dry air for peak load. This configuration would be more beneficial as the air receiver would store the already dried and treated air. 

Seeking expert compressed air advice would be the best way to determine which configuration would be most beneficial to meet your specific application and compressed air demand requirements.

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