Flowserve QLQ Vertical Worthington - Manual (Page 9)

QLQ, QLQC USER INSTRUCTIONS ENGLISH 87900027 – 06/14
Page 9 of 61
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 80 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
conditions, pipework design and acoustic
characteristics of the building.
Typical sound pressure levels measured in dB and
A-weighted are shown in the table in section 1.9.1.
The figures are indicative only; they are subjected to
a +3 dB tolerance and cannot be guaranteed.
The dBA values are based on the noisiest ungeared
electric motors that are likely to be encountered. The
third column table shows 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 should be combined with the level for the driver
obtained from the supplier. Consult a Noise
Specialist for the combined calculation.
If the motor is driven by an inverter, it may show an
increase in noise level at some speeds.

For units driven by equipment other than
electric motors or units contained within enclosures,
see the accompanying information sheets and
manuals.
1.9.1 Typical vertical motor noise data (Hollow
and solid shafts)
Motor
Frame
Size.
NEMA
RPM
Sound
Pressure
(dBA )
Sound
Power
(dBA )
180
3600 70.0 78.0
1800 60.0 68.0
1200 & slower 55.0 63.0
210
3600 70.0 78.2
1800 60.0 68.2
1200 & slower 55.0 63.2
250
3600 75.0 83.4
1800 70.0 78.4
1200 & slower 60.0 68.4
280
3600 75.0 83.8
1800 70.0 78.8
1200 & slower 60.0 68.8
320
3600 75.0 84.0
1800 65.0 74.0
1200 & slower 65.0 74.0
360
3600 75.0 84.2
1800 65.0 74.2
1200 & slower 65.0 74.2
400
3600 80.0 89.5
1800 70.0 79.5
1200 & slower 65.0 74.5
440
3600 80.0 90.0
1800 70.0 80.0
1200 & slower 70.0 80.0
449
1800 85.0 97.8
1200 & slower 80.0 92.8
5000
3600 90.0 102.8
1800 85.0 97.8
1200 & slower 80.0 92.8
5800
3600 90.0 103.7
1800 90.0 103.7
1200 & slower 80.0 93.7
6800
1800 90.0 103.9
1200 & slower 85.0 98.8
8000
1800 90.0 104.7
1200 & slower 85.0 99.7