Flowserve FRBHJC User Manual
Page 9
FRBHJC USER INSTRUCTIONS ENGLISH 71569179 11-04
Page 9 of 36
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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 Lwa sound power level (re 1pW)
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.
FRBH pump size
Sound Pressure
dBA @ 1 m (3 ft)
Sound Power
dBA
Pump speed -rpm
2 FRBH-121
75
89
1780
3 FRBH-121
75
89
1780
3 FRBH-101
75
89
1780
3 FRBH-141
77
91
1780
4 FRBH-111
77
91
1780
4 FRBH-141
78
92
1780
6 FRBH-111
80
93
1780
6 FRBH-142
81
95
1780
8 FRBH-182
83
98
1180
8 FRBH-152
85
99
1780
10 FRBH-182
85
99
1180
6FRBH-183
85
100
1780
8FRBH-183
86
101
1780