October is recognized by the International Hearing Society as a month to promote hearing protection and increase awareness regarding industrial noise-induced hearing loss.
The campaign takes on special relevance in industrial environments, where operations, maintenance, construction, and inspection workers may be repeatedly exposed to high-intensity acoustic sources.
The World Health Organization estimates that more than 1,500 million people currently live with some degree of hearing loss and projects that the figure could exceed 2,500 million by 2050.
The organization further notes that a significant portion of hearing loss can be prevented through public health measures and the reduction of harmful exposures.
In an industrial facility, the problem is not limited to how much industrial noise a machine produces. Compressors, turbines, pumps, control valves, venting systems, and rotating equipment can generate different acoustic fields depending on their operating conditions.
Exposure depends on intensity and time
Noise-induced hearing loss is related to repeated exposure to sufficiently intense sounds.
Damage can occur gradually and is not necessarily accompanied by an immediate signal allowing the worker to identify an injury. Tinnitus, difficulty understanding conversations, or problems perceiving certain sounds may appear as warning signs.
The WHO recommends reducing the volume of personal devices, limiting exposure time, maintaining distance from noisy sources, and using hearing protection when necessary.
For safe listening, the organization also employs the concept of the combination between sound level and exposure duration, as the same noise level does not represent the same risk when the duration of stay changes.
This relationship is particularly important in maintenance. A technician who remains for a few minutes next to a high-intensity source faces a different condition than another worker who remains for hours within a high-noise area.
Therefore, evaluating only the instantaneous decibel level may be insufficient to characterize occupational exposure.
Protection starts before the hearing protector
Industrial noise control must begin, whenever technically possible, at the source and the transmission path. Acoustic encapsulation, vibration isolation, silencers, barriers, process modifications, and proper maintenance can reduce noise before it reaches the worker.
This has a direct connection to maintenance engineering. An abnormal mechanical condition can modify the acoustic behavior of equipment. Imbalance, misalignment, bearing wear, cavitation, or gear problems can generate industrial noise components that accompany other symptoms of deterioration.
Sound, therefore, can also become a complementary signal within a condition monitoring strategy. Hearing protectors remain a fundamental barrier when engineering controls do not sufficiently eliminate exposure. However, their use should not substitute for source evaluation.
In industrial safety, protecting the worker and reducing the hazard at the source are two different actions that can be part of the same strategy.
Hearing is also a safety function
The importance of hearing in an industrial plant goes beyond avoiding future sensory loss. In certain operations, auditory perception contributes to identifying conversations, alarms, warning signals, and abnormal changes in specific equipment.
An excessively noisy environment can hinder this perception and increase communication demands during an intervention.
For that reason, hearing protection must be integrated with the general risk assessment of the area. The selected equipment must provide sufficient attenuation without creating conditions that prevent necessary communication or the perception of critical signals.
Selection must respond to the task, the acoustic environment, and the facility’s safety requirements.
SOURCE and PHOTO: https://www.prnewswire.com
