1.9 Noise level
Attention must be given to the exposure of personnel to the noise, and local legislation will define when guidance to personnel on noise limitation is required, and when noise exposure reduction is mandatory. This is typically 80 to 85 dBA.
The usual approach is to control the 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 attention is drawn to the following table to give an indication of equipment noise level so that you can take the appropriate action in your plant.
Pump noise level is dependent on a number of operational factors, flow rate, pipework design and acoustic characteristics of the building, and so the values given are subject to a 3 dBA tolerance and cannot be guaranteed.
Similarly the motor noise assumed in the “pump and motor” noise is that typically expected from standard and high efficiency motors when on load directly driving the pump. Note that a motor driven by an inverter may show an increased noise at some speeds.
If a pump unit only has been purchased for fitting with your own driver then the “pump only” noise levels in the table should be combined with the level for the driver obtained from the supplier. Consult Flowserve or a noise specialist if assistance is required in combining the values.
It is recommended that where exposure approaches the prescribed limit, then site noise measurements should be made.
The values are in sound pressure level LpA at 1 m (3.3 ft) from the machine, for “free field conditions over a reflecting plane”.
For estimating sound power level LWA (re 1 pW) then add 17 dBA to the sound pressure value.
Motor size |
| Typical sound pressure level LpA at 1 m reference 20 μPa, dBA |
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3 550 r/min | 2 900 r/min | 1 750 r/min |
| 1 450 r/min | |||||
and speed |
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kW (hp) | Pump | Pump and | Pump | Pump and | Pump | Pump and |
| Pump | Pump and |
| only | motor | only | motor | only | motor |
| only | motor |
< 0.55 (< 0.75) | 72 | 72 | 64 | 65 | 62 | 64 |
| 62 | 64 |
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0.75 (1) | 72 | 72 | 64 | 66 | 62 | 64 |
| 62 | 64 |
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1.1 (1.5) | 74 | 74 | 66 | 67 | 64 | 64 |
| 62 | 63 |
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1.5 (2) | 74 | 74 | 66 | 71 | 64 | 64 |
| 62 | 63 |
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2.2 (3) | 75 | 76 | 68 | 72 | 65 | 66 |
| 63 | 64 |
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3 (4) | 75 | 76 | 70 | 73 | 65 | 66 |
| 63 | 64 |
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4 (5) | 75 | 76 | 71 | 73 | 65 | 66 |
| 63 | 64 |
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5.5 (7.5) | 76 | 77 | 72 | 75 | 66 | 67 |
| 64 | 65 |
7.5 (10) | 76 | 77 | 72 | 75 | 66 | 67 |
| 64 | 65 |
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11 (15) | 80 | 81 | 76 | 78 | 70 | 71 |
| 68 | 69 |
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15 (20) | 80 | 81 | 76 | 78 | 70 | 71 |
| 68 | 69 |
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18.5 (25) | 81 | 81 | 77 | 78 | 71 | 71 |
| 69 | 71 |
22 (30) | 81 | 81 | 77 | 79 | 71 | 71 |
| 69 | 71 |
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30 (40) | 83 | 83 | 79 | 81 | 73 | 73 |
| 71 | 73 |
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37 (50) | 83 | 83 | 79 | 81 | 73 | 73 |
| 71 | 73 |
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45 (60) | 86 | 86 | 82 | 84 | 76 | 76 |
| 74 | 76 |
55 (75) | 86 | 86 | 82 | 84 | 76 | 76 |
| 74 | 76 |
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75 (100) | 87 | 87 | 83 | 85 | 77 | 77 |
| 75 | 77 |
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90 (120) | 87 | 88 | 83 | 85 | 77 | 78 |
| 75 | 78 |
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110 (150) | 89 | 90 | 85 | 87 | 79 | 80 |
| 77 | 80 |
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150 (200) | 89 | 90 | 85 | 87 | 79 | 80 |
| 77 | 80 |
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200 (270) | | | | | 85 | 87 |
| 83 | 85 |
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300 (400) |
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| 87 | 90 |
| 85 | 86 |
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The noise level of machines in this range will most likely be of values which require noise exposure control, but typical values are inappropriate.
Note: for 1 180 and 960 r/min reduce 1 450 r/min values by 2 dBA. For 880 and 720 r/min reduce 1 450 r/min values by 3 dBA.
Page 9 of 28 | flowserve.com |