FP USER INSTRUCTIONS ENGLISH 71576286 - 07/06
1.9 Noise level
When pump noise level exceeds 85dBA attention must be given to prevailing Health and Safety Legislation, to limit the exposure of plant operating personnel to the noise. The usual approach is to control exposure time to the noise or to enclose the machine to reduce emitted sound. You may have already specified a limiting noise level when the equipment was ordered, however if no noise requirements were defined then machines above a certain power level will exceed 85 dB(A). In such situations consideration must be given to the fitting of an acoustic enclosure to meet local regulations.
Pump noise level is dependent on a number of factors - the type of motor fitted, the operating capacity, pipework design and acoustic characteristics of the building. Typical sound pressure levels measured in dB and
The figures are indicative only, they are subject to a +3 dB tolerance, and cannot be guaranteed.
The values are based on the noisiest ungeared electric motors which are likely to be encountered. They are LpA sound pressure levels at 1m (3.3ft) from the directly driven pump, for "free field over a reflecting plane". For estimating LwA sound power level (re 1 pW) add 14 dB(A) to the sound pressure value.
If a pump only has been purchased, for fitting with your own driver, then the "pump only" noise levels from the table should be combined with the level for the driver obtained from the supplier. If the motor is driven by an inverter, it may show an increase in noise level at some speeds. Consult a Noise Specialist for this calculation
For units driven by equipment other than
electric motors or units contained within enclosures, see the accompanying information sheets and manuals.
Typical sound pressure level, dBA, LpA at 1 m reference 20 μPa (LwA sound power1 pW where LpA >85 dBA)
Motor size | 3550 r/min | 2900 r/min | 1750 r/min | 1450 r/min | |||||
and speed | Pump and | Pump | Pump and | Pump | Pump and | Pump | Pump and | Pump | |
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kW (hp) | motor | only | motor | only | motor | only | motor | only | |
dBA | dBA | dBA | dBA | dBA | dBA | dBA | dBA | ||
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<0.55 (<0.75) | 71 | 66 | 64 | 62 | 64 | 62 | 63 | 62 | |
0.75 (1) | 74 | 66 | 67 | 62 | 67 | 62 | 63 | 62 | |
1.1 (1.5) | 74 | 68 | 67 | 64 | 67 | 64 | 65 | 64 | |
1.5 (2) | 77 | 70 | 70 | 66 | 70 | 66 | 66 | 66 | |
2.2 (3) | 78 | 72 | 71 | 68 | 71 | 68 | 68 | 68 | |
3 (4) | 81 | 74 | 74 | 70 | 74 | 70 | 70 | 70 | |
4 (5) | 82 | 75 | 75 | 71 | 75 | 71 | 71 | 71 | |
5.5 (7.5) | 90 (99) | 77 | 83 | 73 | 76 | 73 | 72 | 71 | |
7.5 (10) | 90 (99) | 78 | 83 | 74 | 77 | 74 | 73 | 72 | |
11 (15) | 91 (100) | 80 | 84 | 76 | 78 | 76 | 74 | 73 | |
15 | (20) | 92 (101) | 83 | 85 (94) | 79 | 80 | 79 | 76 | 75 |
18.5 (25) | 92 (101) | 83 | 85 (94) | 79 | 80 | 79 | 76 | 75 | |
22 | (30) | 92 (101) | 83 | 85 (94) | 79 | 81 | 79 | 77 | 75 |
30 | (40) | 100 (109) | 85 (94) | 93 (102) | 81 | 84 | 80 | 80 | 76 |
37 | (50) | 100 (109) | 86 (95) | 93 (102) | 82 | 84 | 80 | 80 | 76 |
45 | (60) | 100 (109) | 87 (96) | 93 (102) | 83 | 84 | 80 | 80 | 76 |
55 | (75) | 100 (109) | 88 (97) | 95 (104) | 84 | 86 (95) | 81 | 82 | 77 |
75 (100) | 100 (109) | 90 (99) | 95 (104) | 86 (95) | 88 (97) | 81 | 83 | 78 | |
90 (120) | 100 (109) | 90 (99) | 95 (104) | 86 (95) | 90 (99) | 81 | 85 (94) | 78 | |
110 | (150) | 100 (109) | 91 (100) | 95 (104) | 87 (96) | 91 (100) | 83 | 86 (95) | 79 |
150 (200) | 101 (110) | 92 (101) | 96 (105) | 88 (97) | 91 (100) | 83 | 86 (95) | 79 | |
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