USER INSTRUCTIONS MARK 3 High Silicon Iron ENGLISH 71569249 09-04
®
1.8 Noise level
The values are based on the noisiest non-geared
electric motors that are likely to be encountered.
They represent sound pressure levels at 1 m (3.3 ft)
from the directly driven pump, for "free field over a
reflecting plane". For estimating L
wA
sound power
level (re 1 pW) add 14dBA to the sound pressure
value.
When pump noise level exceeds 85 dB(A) 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.
If a pump unit 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 the combined calculation.
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.
For units driven by equipment other than
electric motors or units contained within enclosures,
see the accompanying information sheets and
manuals.
Typical sound pressure levels measured in dB, and
A-weighted are shown in the table below. The figures
are indicative only, they are subject to a +3 dB
tolerance, and cannot be guaranteed.
Typical sound pressure level, dBA, L
pA
at 1 m reference 20 µPa
3550 r/min 2900 r/min 1750 r/min 1450 r/min Motor size
and speed
kW (hp)
Pump and
motor
dBA
Pump
only
dBA
Pump and
motor
dBA
Pump
only
dBA
Pump and
motor
dBA
Pump
only
dBA
Pump and
motor
dBA
Pump
only
dBA
<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 77 83 73 76 73 72 71
7.5 (10) 90 78 83 74 77 74 73 72
11 (15) 91 80 84 76 78 76 74 73
15 (20) 92 83 85 79 80 79 76 75
18.5 (25) 92 83 85 79 80 79 76 75
22 (30) 92 83 85 79 81 79 77 75
30 (40) 100 85 93 81 84 80 80 76
37 (50) 100 86 93 82 84 80 80 76
45 (60) 100 87 93 83 84 80 80 76
55 (75) 100 88 95 84 86 81 82 77
75 (100) 100 90 95 86 88 81 83 78
90 (120) 100 90 95 86 90 81 85 78
110 (150) 100 91 95 87 91 83 86 79
150 (200) 101 92 96 88 91 83 86 79
200 (270) (1) (1) (1) (1) (1) 83 (1) 80
300 (400) - - - - (1) 84 (1) 81
(1) Motors in this range are generally job specific and noise levels should be calculated based on actual equipment installed.
For 960 r/min reduce 1450 r/min values by 5 dBA.
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