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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.
Motor size
and speed
kW (hp)
< 0.55 (< 0.75)
0.75 (1)
1.1 (1.5)
1.5 (2)
2.2 (3)
3 (4)
4 (5)
5.5 (7.5)
7.5 (10)
11 (15)
15 (20)
18.5 (25)
22 (30)
30 (40)
37 (50)
45 (60)
55 (75)
75 (100)
90 (120)
110 (150)
150 (200)
200 (270)
300 (400)
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 32
Typical sound pressure level L
3 550 r/min
Pump
Pump and
Pump
only
motor
only
72
72
64
72
72
64
74
74
66
74
74
66
75
76
68
75
76
70
75
76
71
76
77
72
76
77
72
80
81
76
80
81
76
81
81
77
81
81
77
83
83
79
83
83
79
86
86
82
86
86
82
87
87
83
87
88
83
89
90
85
89
90
85
FM USER INSTRUCTIONS ENGLISH 71576526 - 03/07
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 L
(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.
at 1 m reference 20 μ Pa, dBA
pA
2 900 r/min
1 750 r/min
Pump and
Pump
motor
only
65
62
66
62
67
64
71
64
72
65
73
65
73
65
75
66
75
66
78
70
78
70
78
71
79
71
81
73
81
73
84
76
84
76
85
77
85
77
87
79
87
79
85
87
at 1 m
pA
1 450 r/min
Pump and
Pump
Pump and
motor
only
motor
64
62
64
62
64
62
64
62
66
63
66
63
66
63
67
64
67
64
71
68
71
68
71
69
71
69
73
71
73
71
76
74
76
74
77
75
78
75
80
77
80
77
87
83
90
85
flowserve.com
64
64
63
63
64
64
64
65
65
69
69
71
71
73
73
76
76
77
78
80
80
85
86
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