PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05
®
1.8 Specific machine performance
For performance parameters see section 1.5,
Duty
conditions
. When the contract requirement specifies
these to be incorporated into User Instructions these
are included here. Where performance data has
been supplied separately to the purchaser these
should be obtained and retained with these User
Instructions if required.
1.9 Noise level
When pump noise level exceeds 85 dBA 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 dBA. 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
(L
pfA
).
The
figures are indicative only, they are subject to a +3 dB
tolerance, and cannot be guaranteed.
The values are based on the noisiest 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".
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 20µPa
)
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
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)
102
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)
←
←
←
←
←
83
←
80
300
(400)
-
-
-
-
←
84
←
81
←
Motors in this range are generally job specific and noise levels should be calculated based on actual equipment installed.
For 960 rpm reduce 1450 rpm values by 5 dBA.
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