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Determine the pump sound level


Every rotating pump makes a noise. For sources of noise which are emitted in the open air, the sound level decreases by 6 dB (A) when the distance is doubled. The table shows the change in the noise level at different distances from the source.

For example, if we use a diesel driven pump as the source of the noise, this has an LWA value of 90. That means 90 dB (A) at 0 meters distance from the pumpset. If we then compare at a distance of 33 feet (10 meters) away from the pumpset, then the calculation is:

LWA-value:  90                    
Distance:  33 ft (10 meters)
Correction: -28,0 dB(A)

Noise level of the pumpset at 33 ft (10 meters): 62 dB(A)

distance to heart sound source
Correction (c)
ft
dB(A)
3,3
8,0
6,6
14,0
9,9
17,5
13,2
20,0
16,5
22,0
19,8
23,5
23,1
24,9
26,4
26,0
29,7
27,1
33
28,0
49,5
31,5
66
34,0
82,5
35,9
99
37,5
115,5
38,9
132
40,0
148,5
41,0
165
42,0
181,5
42,8
198
43,5
231
44,9
264
46,0
297
47,1
330
48,0
363
48,8
396
49,6
429
50,3
462
50,9
495
51,5
528
52,1
561
52,6




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