Pneumatic conveying: what a maintenance manager needs to know

Pneumatic conveying is an everyday occurrence in many industrial environments, but its maintenance often remains at a reactive level. When the system works, it is not touched. When it breaks down, costs rise quickly. For the maintenance manager, this means a constant balancing act between availability, costs and production continuity. Explore our pneumatic conveying solutions and see how a properly sized system supports the maintenance objectives.

In this article, we go through three topics that everyone responsible for the maintenance of pneumatic material handling should master: where wear occurs and how to identify it in time, how predictive maintenance is built in practice, and how energy efficiency relates to the management of the whole system.

Critical wear points and their identification

In a pneumatic system, wear is not evenly distributed. It concentrates at specific points where the material changes direction, speed, or density. Identifying these points is the basis of maintenance, as uncontrolled wear leads to unexpected downtime and costly repairs.

The highest risks of wear can typically be found in the following areas:

• Pipe bends and changes of direction are more susceptible to abrasive wear than straight sections. The harder and more granular the material, the faster the wear progresses.
• Feeders and valves, particularly cap valves, are mechanically demanding components. Their leak-tightness and operational reliability directly affect the reliability of the entire transport cycle.
• Pipe joints are prone to both wear and leaks, especially if the system experiences pressure fluctuations or thermal expansion.
• Separators and silo filters accumulate material residues and can become blocked if their condition is not monitored regularly.

The best tool for identifying wear points is a systematic inspection programme based on system knowledge rather than just a visual walkthrough. Wall thickness measurements in critical piping sections, monitoring of pressure drops and recording of valve cycles provide data that can be used to predict the remaining service life of components. This information is valuable because it shifts decision-making from reaction to planning.

The properties of the material have a significant effect on wear. Abrasive, coarse or heavy material puts stress on the system differently than a light powder. Dense phase conveying, where the material velocity in the pipeline is lower, significantly reduces wear compared to dilute phase conveying. If repeated wear occurs in certain areas of the system, it can be a sign that the conveying method or pipeline geometry has not been optimised for the material being used.

Predictive maintenance in pneumatic systems

Predictive maintenance does not mean replacing everything on a schedule, but replacing the right components at the right time based on data. In a pneumatic conveying system, this requires a clear picture of which components are critical for the continuity of production and which can be serviced in connection with a planned shutdown.

A working predictive maintenance programme is built on the following elements:

1. Criticality classification of components: Not all parts are equal. Valves, pipe bends and filters are often more critical than straight pipe sections. Criticality classification guides the allocation of resources.
2. Defining measurement points: Pressure, temperature and flow rates are basic indicators. Deviations from normal values indicate changes in the system state before the problem becomes visible in production.
3. Inspection intervals by material: Consumable materials require a more frequent inspection schedule. Inspection intervals should be determined based on the material properties and operating hours, not solely on the calendar.
4. Spare parts warehouse for critical components: Valves and seals are components whose availability during a shutdown determines the length of the repair time. A small, well-designed spare parts inventory pays for itself quickly.

Automating the system makes maintenance monitoring significantly easier. Once the pneumatic conveying system is integrated into the plant control system, deviations can be detected in real time and addressed before they lead to downtime. This does not require complex additional investments if the system was originally designed with integration in mind. Discover pressure conveyors and see how a fully automated system supports predictive maintenance in practice.

From the maintenance manager's perspective, a proactive approach pays for itself through improved availability and lower repair costs. Unplanned downtime is always more expensive than scheduled maintenance operations, and this is especially true in the process industry, where a break in the production chain has a wide-reaching impact.

Energy efficiency as part of system management

Pneumatic material handling consumes more energy than many other transport methods, and this is a recognised fact. However, that does not mean that energy consumption cannot be influenced. A correctly designed and maintained pneumatic system operates significantly more efficiently than a poorly sized or worn-out assembly.

The greatest energy losses in a pneumatic system typically occur:

• From leaks in the pipework or connections that imperceptibly increase the compressor load
• Incorrectly dimensioned air volume in relation to the amount of material being conveyed
• Blocked filters, which increase the pressure drop and force the compressor to work harder
• Regarding the choice of transport method, if the dilute-phase method is used in situations where dense phase would be a more energy-efficient alternative

Dense phase transport uses less compressed air than dilute phase transport because the material velocity in the pipeline is lower. This is directly reflected in the energy consumption of the compressor. When the system is correctly sized from the outset and maintenance keeps it in working order, energy efficiency remains at a good level throughout its life cycle.

Monitoring energy efficiency should be included as part of standard maintenance tracking. An increase in a compressor's energy consumption without an explicit reason is often a sign of a leak, blockage, or another factor degrading the system's condition. By monitoring energy consumption regularly, problems can be detected at an early stage and rectified before they grow larger.

In an industrial environment where energy costs form a significant part of operating expenses and sustainability targets drive investment decisions, the energy efficiency of a pneumatic system is a strategic issue, not merely a technical detail. A well-managed system supports both production efficiency and the organisation's broader sustainability goals. Explore pneumatic conveying solutions and assess how your system meets today's requirements.

Kopar has designed and supplied pneumatic conveying systems for demanding industrial environments for nearly 50 years. Our experience covers the entire lifecycle from engineering to commissioning and maintenance services. If you want to assess the condition of your system or explore opportunities for development, Contact our experts.