www.hpmag.co.uk HYDRAULICS & PNEUMATICS June 2026 35 easily a single technician can perform the job with minimal tools. Serviceability should be evaluated not just in terms of accessibility, but in terms of its effect on mean time to repair, downtime duration, and operational continuity In many industrial facilities, dryers are often placed in tight, inconvenient spaces, yet access is paramount. For maintenance tasks, such as a simple filter check or complex valve replacement, technicians require adequate room. A compact design might mean that essential service points are pressed against a wall or obscured by piping. Filter accessibility or cartridge replacement time are therefore key considerations so that filters can be replaced without extensive disassembly and essential components like cartridges can be swapped out. If a unit requires significant disassembly or the use of specialised lifting gear just to access a component, the service time increases, which can lead to higher labour costs and greater risk of accidental damage. This is particularly relevant for outdoor installations, such as those on a roof, where accessibility is already a major logistical hurdle. Build considerations Not all compressed air dryers are built for the same timeline. Some are designed for a short economic lifespan, others for more than 20 years in critical environments. Materials coating systems, like those compliant with DIN EN ISO 12944, and component quality all factor into the expected lifespan of a compressed air dryer. One key consideration is that while investing in a longer lifespan might cost more upfront, it may potentially save significantly when it comes to TCO. In addition to robust construction, the system should also be designed for low pressure drop, as unnecessary restrictions force compressors to run at higher discharge pressures, increasing energy consumption and operating costs. However, oversizing components is not systematically beneficial. While larger equipment may reduce pressure losses, excessive oversizing can negatively affect control stability, part-load efficiency, and system dynamics. Optimal performance is achieved through appropriate sizing based on realistic operating conditions, including average flow, peak demand, and load variability. Monitoring parameters such as pressure drop, flow rate, pressure dew point, and power consumption enables identification of inefficiencies and supports data-driven maintenance strategies, helping to extend service intervals and minimise unplanned downtime. Other considerations It is important to verify that the pressurecontaining components comply with applicable regulatory requirements. In Europe, this mainly includes PED compliance and CE marking, while internationally ASME may be required. Depending on the application, ATEX compliance may also be necessary. In addition, material certification according to EN 10204 (e.g., 3.1 or 3.2) is often required for pressure-containing components and local laws and regulatory interpretations should always be considered. If you are exporting or moving equipment across borders, design certifications might become even more critical. Compressed air contains not only moisture and particulates but also gaseous components inherent to atmospheric air. While these gases are normally harmless in standard pneumatic applications, their presence becomes critical in specialised processes such as nitrogen generation, breathing-air systems, electronics manufacturing, and certain laser cutting operations. Carbon dioxide levels may also require consideration in confined environments and sensitive applications. Achieving the required air quality therefore depends on a combination of technologies, including dryers for moisture control (pressure dew point management), particulate and coalescing filtration for aerosols and solids, and adsorption technologies such as activated carbon for vapour-phase contaminants. Choosing an appropriate compressed air dryer demands consideration of a broader range of criteria beyond fundamental specifications alone. Evaluating environmental conditions, maintenance requirements, regulatory standards, and total ownership costs supports a more informed decision for sustained operational reliability and optimised system effectiveness. *This information is provided for general guidance only and should not be considered legal, regulatory, or technical advice. For further information please visit: www.donaldson.com
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