Flowserve VTP Wet Pit - Manual (Page 9)

VERTICAL TURBINE PUMPS (VTPS) CENTRIFUGAL PUMPS ENGLISH 71569224 – 10-13
Page 9 of 76 flowserve.com
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
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
pA
at 1 m
(3.3 ft) from the machine, for “free field conditions
over a reflecting plane”.
For estimating sound power level L
WA
(re 1pW) then
add 17 dBA to the sound pressure value.
The noise levels shown in table 1.9.1 are
extracted from typical motor manufacturer’s
data/catalogue to provide the average expected
motor noise values at no load for reference only and
are not guaranteed. The values could vary
depending upon the test and surrounding conditions.
The combined noise level of the pump and the motor
could exceed the values shown. It is to be noted that
adding motors with similar noise levels increases the
total noise level. Therefore, the dB correction to the
values listed above is required to obtain the
combined noise levels of motor and the pump.
Actual on-site noise measurement by experts is
recommended and safety measures are to be taken
accordingly.
Typical vertical motor noise data (Hollow 1.9.1
and Solid shafts)
Motor
Frame
Size.
NEMA
RPM Sound
Pressure
(dBA )
(WP- I
enclosure)
Sound
Power
(dBA )
(WP- I
enclosure
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
Specific machine performance 1.10
For performance, parameters see section 1.5, Duty
conditions
. Whenever there is a contract
requirement to incorporate specific machine
performance into User Instructions, those are
included here. In cases where performance data has
been supplied separately to the purchaser, the same
should be retained with these User Instructions, if
required.