What industrial Noise pollution is, its causes and effects

Major noise pollutants in a factory

Measures to reduce the Noise in a factory

Industrial pollutants are not limited to solid waste, liquid waste, and gaseous wastes. Industrial processes can also cause loud noises which are Noise Pollution. Industrial processes impair the hearing of workers, bystanders or residents. Residents in nearby can also be affected by noise pollution from safety alarms and heavy truck traffic in industrial areas.

Industrial & manufacturing plant noise causes lower productivity, safety communication is less, more cases of worker fatigue is reported, absenteeism is also higher. Irritability and temper changes are also caused due to too much noise in the working environment.

85 dBA for 8 hours a day is the standard accepted to minimize the hearing risk. Noise levels above 140 dB are not considered safe for any period of time.

With proper planning and design of the process, factory layout, machinery, and equipment, we can reduce the Noise of a plant by using Industrial Silencers, Acoustic enclosures to reduce the overall noise in the process and petrochemical plant.

Noise can permanently damage hearing by a single brief exposure to a high noise level, such as a firecracker bursting near the ear. Hearing damage can also occur gradually to continuous exposure to noise.

Noise levels in dBA compared with known sources

  0 dBA Threshold for hearing
35 dBA Residential at night
40-50 dBA Residential in Daytime
65 dBA Office
75 dBA vacuum cleaner
82 dBA Railway Station
100 dBA Motorcycle riding, Handheld Drill
110 dBA Rock Music, Jack Hammer
115 dBA Ambulance, Riveter
140 dBA Jet engine takeoff


Noise pollution causes various physical, psychological and physiological disorders and results in damaging human health. It is important to take all the necessary precautions to control the threat of noise pollution for environment protection.

One of the basic principles of noise control is that noise should be reduced as near the source as possible.

While planning the Industrial process the dBA level should be considered and should also be monitored continuously. Some process that can be considered is Welding instead of riveting, Pressing instead of forging, Grinding instead of chipping, etc…

While selecting the machine tools and equipment, care should be taken to choose the tools which generate less noise than the ones that are cheaper.

Identification of Noise Source

Impact Noise of general equipment and machinery noise. Example of Impact noise is Gearbox noise, electric motor noise, hammering and riveting. These noises are generally induced by pressure fluctuations in the equipment but mechanical vibrations induced by metal to metal contact.

Atmospheric intake, air-turbulence noise from air and steam exhausts noise. Air compressors and Exhausters, burners cause Noise pollution through the Steam and gas vents, ejectors, pneumatic exhausts, etc..

Noise radiated by pipelines downstream of pressure reduction or pressure regulating valves, fan ducts, compressor pipework systems including aftercoolers, receivers, etc.

Noise radiates through the walls of the duct or pipework where fluid borne noise levels within the duct are very high and are transmitted freely through the system. It may also be evident in the form of “induced ringing” of pipework, as may occur in compressor pipework.

How to reduce Industrial noise:

Noise can be effectively reduced at the source, with an Industrial silencer that lowers the escape velocity of the exhaust. The maximum effect of the silencer is obtained from silencers by installing them as close as is practical to the noise source.

To reduce the noise of small pneumatic tools, an exhaust collecting sleeve is incorporated into the tools.

To reduce noise in larger portable tools is to conduct the exhaust air away, through a second line, to a remote silencer.

While lifting parts from dies or when the jet of air is used for cleaning of there is a lot of noise generated this can be reduced by keeping the air pressure minimum for the operation.

Noise caused by bends in pipes and ducts, turbulence at outlets and valves can be reduced by streamlining and by lowering the velocity of air or gas passing through them.

Noise caused by the handling and dropping off materials on hard surfaces can be reduced by with resilient materials as surface and for containers. Fitting rubber tires to trolleys reduces a lot of Noise in the movement of materials.

Proper maintenance of machinery and equipment can reduce the machine rattling and vibration movements. Proper lubrication reduces the noises caused by friction in machines, conveyors, and roller trolleys.

The acoustic enclosures can be employed in Toolroom, Diesel Generating set operation, Hammers, etc…

To know more about the type of noise, determination and selection of Industrial silencer visit our webpage …..https://www.engineeringequipmentindia.com/industrial-silencer/