8 noise level – Flowserve ESP2 User Manual
Page 8
ESP2 USER INSTRUCTIONS ENGLISH PCN-(71569292) 4-12
Page 8 of 64
1.8 Noise level
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.
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
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.
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.
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.
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, L
pA
at 1 m reference 20 μPa
Motor size
and speed
kW (hp)
3550 r/min
2900 r/min
1750 r/min
1450 r/min
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.