Complying with specifications and safety standards, protecting operators and the environment, controlling operating costs and energy consumption, limiting production line downtime, meeting deadlines, and avoiding product recalls due to potential filtration defects…
To meet all these requirements effectively, the key is to implement a preventive replacement program adapted to the filter systems you use. Replacing filters too late exposes you to all the risks mentioned above. Replacing them too early leads to unnecessary production stoppages and avoidable expenses. Adopting a well-structured filter replacement schedule instead allows you to anticipate orders and manage inventory and production more efficiently.
Discover all our recommendations for setting up an optimized maintenance program.
Reducing utility production costs
Take the example of air filters. As they are used, filters gradually clog due to the impurities they retain, restricting airflow. To allow the air being treated to continue passing through the filter, pressure must be increased more and more.
To establish an accurate filter replacement planning program, it is therefore necessary to monitor differential pressure. This value, measured in bar or psi, corresponds to the difference in pressure upstream and downstream of the filter. Its evolution reflects the flow restrictions caused by filter aging.
However, compressing air has a cost—one that increases as the required pressure rises. Regular filter replacement therefore represents a potential source of savings in air production and, more broadly, in utility generation.
Some manufacturers provide recommendations on the matter, but economic considerations also come into play, as the optimal decision results from a balance between rising energy costs (due to higher pump activity) and the cost of replacing your filters.
Meeting sanitary requirements, particularly regarding bacterial contamination
Some filters must be regularly sterilized to meet bacterial standards, for example in the pharmaceutical or food industries. This operation is often carried out using steam. However, this high-temperature process applies strong stresses to the filtering elements, which eventually wear down the media over time, altering it or compromising its integrity.
Manufacturers often provide filter replacement guidelines, based on the average number of sterilization cycles a filter can withstand—typically around a few dozen to a hundred. While these recommendations are useful, it is important to remember that each installation subjects its filters to constraints specific to its own process. These constraints may also fluctuate depending on the composition and particle load of the raw materials used or of the products being filtered.
Expert advice
In the case of filters used for bacterial filtration, monitoring the contamination level of utilities or treated products provides insight into the condition of the filters. For example, if the filtered air or water shows higher contamination than usual, it is a sign that the filters are failing or at least nearing the end of their service life.
Focus: should all filters in a system be replaced, or only some of them?
Do you necessarily save money by replacing only the damaged filter rather than all the filters operating within the same production system? Experience shows that this is often not the case.
Take the example of a dust-collection system. Dust collectors are designed by taking several factors into account, including particle size and the total volume of air to be treated. Designers also consider the increase in pressure drop and the decrease in flow rate that occur as the filter ages.
Initially, all filters installed in parallel within the dust collector are new. Their flow resistance and the airflow passing through them are uniform. These parameters evolve together over time. When a new filter is installed to replace a failing one, its resistance is much lower than that of the other clogged filters. The airflow through this new filter will therefore be abnormally high for a time, until it becomes clogged enough for its flow resistance to match that of the already-loaded filters. The freshly replaced filter will thus experience accelerated deep clogging and stress during this period, ultimately reducing its lifespan and influencing how the other filters evolve.
By contrast, replacing all filters in the dust collector ensures uniform pressure drop. Each filter then operates under the optimal flow and pressure-drop conditions for which it was designed. This nominal operation makes cleaning cycles less frequent, extends the overall service life of all filters, and reduces downtime of the dust-collection system. The outcome is lower maintenance and operating costs.
Thus, replacing all worn filters in a filtration system is often a far better investment than replacing only those already showing signs of failure.
Contact a filtration expert
We are at your service
Our experts place their knowledge and expertise at your disposal for liquid filtration, air and gas filtration, decontamination, and separation technologies.
