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Noise generated by a Petrol Driven Float on a construction site
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#1 Posted : 14 October 2009 14:00:00(UTC)
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Posted By shaun7474
We have a sub contractor working for us on a construction site. He will be laying a concrete floor within a coldroom using a petrol driven power float. The noise rating for the float is 94dB. The float operator will wear ear defenders with an SNR of 27dB - and the same goes for any other operatives in the room when the float is being used. The builder wants to know what the safe distance will be from the machine for other operatives/trades who may be in the vicinity where hearing protection will not be required. He has said this is our responsibility to provide this information to him. Do you think this is correct or should he take responsibility?
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#2 Posted : 14 October 2009 14:20:00(UTC)
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Posted By Richard Altoft
He has told you of the hazard and given details.He has a responsibility to do all that is reasonably practicable to reduce risk. However beyond that it is the Principal Contractor (if there is one) and the employers of any others at risk to respond and to take action to protect their own workforce.
In real terms a "safe distance" calculation by him would have to assume no other noise energy inputs after the float which is unrealistic unless all other work activities have stopped. Hence the various creators of those other noise inputs should do their own calculations based on what they know about the float and their own works. Noise readings and directions on adequate PPE by the PC is the practical way forward
R
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#3 Posted : 14 October 2009 16:00:00(UTC)
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Posted By Robert K Lewis
If this was science forum I could refer you to this link below

http://www.campanellaaco...com/faq.html#basic_decay

This gives the computation if you really want it. But at the levels you state one will expect to achieve around 67-70dB(A) around 15-20m fromm the nearest point of the floor perimeter that is being floated. Note this is not the centre of the floor and thus you have a countour around the structure/area.

This is the absolute best case and one might expect some higher values for a variety of atmospheric conditions and environmental obstructions.

Bob
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