DUST & FUME EXTRACTION
WHY DUST CONTROL MUST KEEP PACE WITH CHANGING PRODUCTION ENVIRONMENTS
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Changes to production processes can alter how combustible dust is dispersed. Dave Heathcote, industrial vacuum specialist at Nilfisk, explains why dust management should be reviewed whenever operations change.
dust control strategy that was effective six months ago may not be suitable today because manufacturing environments rarely stand still. A new production line, an equipment upgrade or a change in output can all
influence the way combustible dust is created, dispersed and managed.
Yet dust control measures are often left unchanged, even as production evolves. The problem is that combustible dust risks do not remain static when production changes. Existing dust extraction routines may no longer be sufficient, and controls that once worked well may become less effective than expected. Without regular reassessment, the gap between current operating conditions and existing risk controls can gradually widen.
When dust control measures fail to evolve alongside these changes, risks can emerge gradually and often without obvious warning signs. Health and Safety Executive (HSE) analysis of dust fires and explosions reported over a ten-year period identified 295 incidents across UK industry, including 95 explosions with no injury and 41 explosions that resulted in injury or death. These figures underline why dust control arrangements should be reviewed whenever operational conditions change, rather than assumed to remain effective indefinitely. A dust control strategy should never be treated as a fixed measure. It needs to keep pace with the way a site operates and should be regularly reviewed.
DUST RISK STARTS WITH THE PROCESS Combustible dust is created by the process itself, so effective control starts with understanding how materials move through production. This is especially important in manufacturing environments where dry materials are regularly transferred, processed or packaged. In these settings, some dust generation is often unavoidable, making source control central to safe and efficient operation. The most effective way to control combustible dust is to prevent it from spreading beyond the point where it is generated. Once dust escapes into the wider working environment, it becomes more difficult to manage and more likely to accumulate in unwanted areas.
Achieving effective source capture requires an understanding of how the process operates in practice. Dust is rarely generated in one location only, and release points can shift as production conditions change. Controls therefore need to reflect the realities of the process rather than rely on a one-size-fits-all approach.
HOW PRODUCTION CHANGES INFLUENCE DUST BEHAVIOUR
Changes to production can alter dust behaviour without any obvious fault in the system. Longer production runs, faster line speeds, new materials and altered handling methods can all affect how much dust is produced, where it is released and how easily it can be captured or removed. Production changes can also alter where dust travels and settles. A revised transfer point, adjusted airflow pattern or new equipment layout may create new areas where dust can accumulate, even when the process appears to be operating as intended.
Increased dust generation can place greater demands on extraction systems and housekeeping programmes, making existing controls work harder than originally anticipated. Every significant production change should therefore prompt a review of dust control. That review should extend beyond obvious production areas, because changes in dust behaviour often become visible in less accessible parts of the facility first.
THE HIDDEN PROBLEM ABOVE THE PRODUCTION LINE Combustible dust does not only accumulate where production takes place. Significant deposits can build up above the production line on beams, pipework, cable trays, lighting fixtures and other overhead structures that are difficult to inspect and access. Because these areas are often outside routine cleaning programmes, dust can remain undisturbed for long periods.
The consequences of overlooking high- level dust accumulation have been seen in the UK before. At Bosley Mill in Cheshire, where wood was processed into fine powder, an explosion in 2015 killed four workers and destroyed much of the site. While Bosley Mill involved wood dust, the wider lesson applies across manufacturing. Dust hazards often develop gradually in areas that receive little attention until an incident exposes the scale
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of the problem. Production may continue for years without incident, creating a false sense of confidence that existing controls are still performing as intended.
High-level cleaning is therefore a critical part of dust management. Dust found on floors and equipment may indicate a wider issue overhead, where deposits can build unnoticed. If allowed to accumulate, this material can eventually fall back onto machinery, products and working surfaces, creating additional housekeeping and safety challenges. For combustible dust environments, high- level cleaning should be treated as a planned control measure rather than an occasional deep clean. The method used also matters. Cleaning activities should remove dust without dispersing particles into the atmosphere or creating concentrated dust clouds. This is particularly important in ATEX areas, where an explosive atmosphere may be present, and cleaning equipment must be designed to minimise ignition risks.
A production area may appear clean at floor level, but that does not mean dust is being controlled throughout the facility.
CLEANING IS A CONTROL MEASURE, NOT A COSMETIC FIX Routine cleaning has an important role in dust control, but the way it is carried out matters. Poor cleaning methods can disturb settled dust and move it into other parts of the production area, rather than removing it safely. Dry sweeping may improve the appearance of a production area, but it can also put fine particles back into the air. Compressed air can create the same problem on a larger scale, spreading dust into areas that are harder to inspect and control.
Effective cleaning should be based on how the material behaves once it leaves the process. The most appropriate cleaning method for one type of dust may be entirely unsuitable for another. Depending on the material and environment, industrial vacuum systems, local exhaust ventilation or other control measures may be needed. The aim should be to remove dust from the area, not push it elsewhere. Cleaning routines should also be reviewed when equipment layouts, materials or working patterns change. Where cleaning no longer reflects the way the process operates, dust control can quickly become inconsistent.
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