Focus on: Compressed Air Process, Controls & Plant October/November 2026 www.pwemag.co.uk Plant & Works Engineering | 19 supporting stable performance and helping extend the life of sensitive equipment. The most effective and reliable filter housings and elements are designed with application and service life in mind. Features like flow-optimised internal geometry and robust construction will support smooth, uninterrupted flow across a wide range of pressures and capacities. Elements should offer high contaminant-holding capacity and filtration performance that supports effective separation of solids, liquids and aerosols. Maintenance and adaptation Filtration needs may change with process updates, flow adjustments or filter media upgrades. Standardised and modular housings and filter configurations in a compressed air filtration system can be adapted over time without redesigning the filtration system. This allows a system to grow and change alongside a business’s operational needs instead of replacing an entire installation when requirements shift. Also, high-quality housings are often designed for dual-use, allowing the internal configuration to be flipped to allow air to flow from the inside-to-outside (for removing liquid aerosols) or outside-to-inside (for dry dust), depending on the specific contamination challenge. Modern filtration systems prioritise uptime by making maintenance as fast and infrequent as possible. To help avoid guesswork, smart monitoring systems use differential pressure indicators to alert the operator when the energy cost of a clogged filter exceeds the cost of a new element. Housings made of durable materials can help extend their operational lifespan, even when exposed to the acidic condensate that naturally collects at the bottom of the filter bowl. By using these modular and standardised components, a facility can maintain a living system that is easy to service, cost-effective to operate, and ready to adapt to new technology or production demands. Durable materials and service-friendly designs also support straightforward maintenance to help keep systems running with little interruption. System integrity and compliance In industries where air and gas purity is critical, ISO 8573-1, the global standard for compressed air purity, provides a clear framework for managing air quality, specifying purity classes of compressed air with respect to particles, water and oil independent of the location in the compressed air system at which the air is specified or measured. ISO 8573-1 is essentially a preventative health plan for systems that rely on compressed air. Standardising the quality of air flowing through pipes allows organisations to move from reactive to predictive maintenance to help reduce unplanned downtime. It also supports consistent product quality, as compressed air stops being an imprecise utility and becomes a measurable and controllable part of the manufacturing process. An ISO 8573-1 compliant unit has undergone rigorous laboratory tests on the housing-element combination, not just the element alone. When the original combination of components is used, the operator can be assured by the manufacturer’s data that the air exiting the filter meets a specific class of purity. If a different element is used, that certified performance rating is technically no longer valid. Strong combination Choosing from a range of particulate, coalescing and activated carbon elements means operators can configure filtration setups that support their regulatory and internal quality requirements. When a housing and a filter element are engineered as a unified system, they function like a lock and key. The sealing surfaces are precision-machined for an airtight seal, even under extreme pressure fluctuations, heavy vibration and thermal cycling that are common in industrial compressor rooms. The zero-bypass seal is the most critical point in any filter as it is the interface where the element meets the housing. This is usually managed by an O-ring or a specialised gasket. If an element is even 1mm off in size, or if the gasket material is slightly different from the original specification, air will take the path of least resistance. This bypass allows contaminated air to slip around the filter media instead of going through it. When the housing and element are developed together, the sealing surfaces are precision-machined for an airtight seal, even under extreme pressure fluctuations, heavy vibration and thermal cycling that is common in industrial compressor rooms. Standardised systems also allow for cascading filtration or multi-stage filtration, where air passes through increasingly finer media. This is important for element protection, total cost of ownership and air control. While generic elements might look similar, they often lack the specific engineering tolerances required to guarantee the performance of the entire system. High-purity filter elements are engineered with dense, fine fibres to trap microscopic particles and oil aerosols. If these delicate elements are exposed to raw compressed air, the fine pores of the element will clog almost immediately, requiring a premature and costly replacement. The use of a coarse particulate or general-purpose coalescer as a pre-filter captures the heavy lifting contaminants first. This allows the high-efficiency element to focus solely on the microscopic contaminants it was designed for, which may significantly extend its service life. The total cost of ownership for a system is influenced by how often elements are changed and how much energy the compressor consumes. Using a series of filters means the stages can be tailored to a specific air volume so that no single filter becomes a bottleneck that forces the compressor to work harder. Consistent results Housings and filter elements that are developed together can help provide reliable, consistent results across a compressed air or gas system. Whether compressed air is being filtered in a multi-stage purification setup or serving gas systems under high pressure or corrosive conditions, reliable housing and filtration combinations support stable operating conditions. For further information please visit: www.donaldson.com Please note: This information is provided for general guidance only and should not be considered legal, regulatory, or technical advice. Wolfgang Bongartz, Global Product Manager Industrial Gases at Donaldson
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