Examples of noise emission declaration data and risks
Noise emission declaration data
The noise emission data below is an example of the sort of information that you find included in the instructions supplied with equipment. Similar, perhaps abbreviated, information should appear in technical sales literature. Manufacturers use text and tabulated formats and often a combination of both.
Declaration of conformity with the reporting of sound power level in accordance with Outdoor noise Directive 2000/14/EC is often made in the format of the model table provided in that Directive.
Example 1 – a machine falling within the scope of Machinery Directive 2006/42/EC
Edge banding machine ABC123
The emission sound pressure levels at the operator positions are: at the infeed 83.6 dB(A), uncertainty, K, is 4.0 dB(A) and at the outfeed 76.7 dB(A), uncertainty, K, is 4.0 dB(A).
The sound power level is 98.6 dB(A), uncertainty, K, is 2.8 dB(A).
Operating conditions and procedures during noise testing are in accordance with EN 1218-4:2004 + A2:2009. Sound pressure level at the operator positions have been measured in accordance with EN ISO 11202:2010. The sound power level has been determined in accordance with EN ISO 3746:2010. Uncertainty has been determined in accordance with EN ISO 4871:2009.
Example 2 – A machine in the scope of the Outdoor noise directive 2000/14/EC
Vibratory compactor AA11
The emission sound pressure level at the operator’s position, LpA, is 93 dB(A), uncertainty, K, 1.7 dB(A).
The sound power level is 103 dB(A), uncertainty, K, 2.0 dB(A).
The test area, operating conditions under load, and period of observation are in accordance with Annex C to EN 500-4:2011. Sound pressure level has been measured according to EN ISO 11204:2010. The sound power level has been determined in accordance with Outdoor noise Directive 2000/14/EC and EN ISO 3744:2010. Uncertainty in measurement has been determined in accordance with EN 4871:2009.
Before making your final decision on noise, you must be satisfied that noise information you are going to compare has been measured in the same way for each of the machines you are considering. The supplier should be able to tell you what noise test code was used from the instruction manual – either alongside the noise information or on the certificate of conformity.
If you buy new equipment and noise information is not provided in the instruction book (or was not in the technical sales literature) please inform HSE at [email protected] – providing the name of the manufacturer and the equipment model number.
Example of information concerning noise risk supplementing the noise declaration
Example 1 - information concerning installation and assembly for reducing noise
The machine should be mounted on the vibration isolation system specified to prevent vibration entering the floor and radiating as noise in the factory.
Example 2 - instructions on the use of machinery and employee training for low noise
Ensure that the acoustic hood is locked into position before operating the machine. Hearing protection must be worn to control the residual noise risk from this machinery.
Example 3 - information on safeguarding and complementary measures to control noise
Noise has been minimised at source. We supply noise havens for control consoles and other noise control equipment that should be used when your main application of the machine produces more than 80 dB(A), for example cutting carbon steel plate of more than 3mm.
Example 4 - information on need for personal protective equipment (hearing protection)
For very high level continuous noise:
Noise from this machine varies greatly according to its application. The performance of hearing protection needs to be carefully selected to match your application of the machine. Hearing protection with an SNR 20 dB or less is usually adequate for thin plate (noise below 90 dB(A)). For cutting of thick plate (when noise is likely to exceed 100dB(A)) outside the noise haven, hearing protection should have a SNR of 30 dB or more.
Or for high level low frequency noise:
This generator set produces high levels of low frequency noise. Use hearing protection with an assumed protection value of between 5 and 19 dB for the 63 Hz octave band.
Or for peak noise:
In the unlikely event that anyone is required to work near the cartridge when it discharges you should ensure that hearing protection used has an M value of at least 19 dB.
Example information on residual risk from noise
75 dB(A) according to EN xxxx:2005
It is known that noise determined according to EN xxxx:2005 as above, under-represents workplace risk.
Noise at workstations is usually below 80 dB(A) when cutting carbon steel plate less than 3mm thick. Noise is about 85 or 86 dB(A) when cutting 6mm carbon steel plate and is higher for thicker metal. Noise is likely to exceed 100 dB(A) when cutting 40mm carbon steel plate or 25mm stainless steel plate.