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A PRACTICAL GUIDE FOR THE REDUCTION OF NOISE FROM CONSTRUCTION WORKS ENVIRONMENTAL PROTECTION DEPARTMENT NOISE POLICY GROUP , Table 4—Approximate sound pressure levels in dB(A) Leq at 15 metres for various piling methods 28 , a crushing force of approximately 90 tonnes exerted by the jaws can be achieved

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A small change in the number you see on the vacuum specification makes a huge difference to the noise you will hear A reduction of 3db equates to the noise level reducing by half! The noise level of a standard vacuum cleaner is around 78-80 dB For the most quiet vacuum cleaner you want to be looking for a noise level of less than 72dB

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That’s a common question here at low decibel, The back of the envelope answer is that for every 10 dB increase, sound level doubl This means a standard blender (which blends at about 88 dB) is twice as loud as a lower decibel model that blends at 78 dB and four times as loud as an ever lower decibel model that blends at 68 db In other .

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Noise is measured as a “dose” that is calculated as a combination of the noise level and duration of the noise The level is measured using the decibels scale, which is abbreviated as dB This scale is a logarithmic scale meaning the noise level doubles with each 10 dB increase—at a level of 80 dB normal conversation is possible, while at .

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Introduction • New “Control of Noise at Work Regulations 2005” replaced current noise regulations from 6th April 2006 • Headline: 5 dB reduction in exposure which triggers duties to control • Opportunity: A revised framework for management of noise risks • New regulations, new emphasis

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Example noise levels, dB* Established noise control methods Further information (links) 100 (granulators) Granulators (and other size reduction machines eg agglomerators, crumbers, shredders, pelletisers) Methods include: • use feed conveyor to remove operator from higher noise areas • situate size reduction

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Figure 101 Desired noise spectrum for an overall level of 90 dB(A) To adequately define the noise problem and set a good basis for the control strategy, the following factors should be considered: type of noise noise levels and temporal pattern frequency distribution noise ,

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