Specific Machine Performance; Noise Level - Flowserve CPX User Instructions

1.8 Specific machine performance

For performance parameters see section 1.5, Duty
conditions. Where performance data has been supplied
separately to the purchaser these should be obtained
and retained with these User Instructions.

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
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)
1 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.
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CPX, CPXR, CPXN and CPXP USER INSTRUCTIONS ENGLISH 71569117 02-10
Typical sound pressure level L
3 550 r/min
Pump Pump and Pump
only motor only
72 72
72 72
74 74
74 74
75 76
75 76
75 76
76 77
76 77
80 81
80 81
81 81
81 81
83 83
83 83
86 86
86 86
87 87
87 88
89 90
89 90
1 1
–
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 L
(3.3 ft) from the machine, for "free field conditions
over a reflecting plane".
For estimating sound power level L
add 14 dBA to the sound pressure value.
at 1 m reference 20 µPa, dBA
pA
2 900 r/min
Pump and Pump
motor only
64 65 62
64 66 62
66 67 64
66 71 64
68 72 65
70 73 65
71 73 65
72 75 66
72 75 66
76 78 70
76 78 70
77 78 71
77 79 71
79 81 73
79 81 73
82 84 76
82 84 76
83 85 77
83 85 77
85 87 79
85 87 79
1 1
85
87
(re 1 pW) then
WA
1 750 r/min 1 450 r/min
Pump and Pump
motor only
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
at 1 m
pA
Pump and
motor
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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