8 specific machine performance, 9 noise level – Flowserve MARK 3 GROUP 4 User Manual
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MARK 3 GROUP 4 USER INSTRUCTIONS ENGLISH 71569286 08-12
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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. The levels specified in
the table below are estimated and not guaranteed.
The dBA values are based on the noisiest ungeared
electric motors that are likely to be encountered.
They are 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.
Motor size
and speed
kW (hp)
Typical sound pressure level L
pA
at 1 m reference 20
µ
Pa, dBA
1 750 r/min
1 450 r/min
1180 r/min
980 r/min
Pump
only
Pump and
motor
Pump
only
Pump and
motor
Pump
only
Pump and
motor
Pump
only
Pump and
motor
<0.55(<0.75)
62
64
62
64
60
62
60
64
0.75 (1)
62
64
62
64
60
62
60
64
1.1 (1.5)
64
64
62
63
62
64
60
63
1.5 (2)
64
64
62
63
62
64
60
63
2.2 (3)
65
66
63
64
63
66
61
64
3 (4)
65
66
63
64
63
66
61
64
4 (5)
65
66
63
64
63
66
61
64
5.5 (7.5)
66
67
64
65
64
67
63
65
7.5 (10)
66
67
64
65
64
67
63
65
11(15)
70
71
68
69
68
71
67
69
15 (20)
70
71
68
69
68
71
67
69
18.5 (25)
71
71
69
71
69
71
68
70
22 (30)
71
71
69
71
69
71
68
70
30 (40)
73
73
71
73
71
73
70
72
37 (50)
73
73
71
73
71
73
70
72
45 (60)
76
76
74
76
74
76
72
75
55 (75)
76
76
74
76
74
76
72
75
75 (100)
77
77
75
77
75
77
73
76
90 (120)
77
78
75
78
75
78
73
76
110 (150)
79
80
77
80
77
78
75
78
150 (200)
79
80
77
80
77
78
76
78
200 (270)
85
87
83
85
81
83
80
82
300 (400)
87
90
85
86
83
85
82
84
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.