Flowserve MP1 Sier-Bath - Manual (Page 10)

MP1 USER INSTRUCTIONS ENGLISH 26999958 – 10-12
Page 10 of 48 flowserve.com
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 Table 2 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 LpA at 1 m (3.3
ft) from the machine, for “free field conditions over a
reflecting plane”.
For estimating sound power level LWA (re 1 pW) then
add 14 dBA to the sound pressure value.

For units driven by equipment other than
electric motors or units contained within enclosures,
see the accompanying information sheets and
manuals.
Table 2 Max Sound Levels of Pumps
Multiphase Twin
Screw
pump size
Sound Pressure
Level
dBA @ 1 m (3.3 ft)
Pump
Speed
rpm
MP1-150-xxx 90 1780
MP1-275-xxx 90 1780
MP1-380-xxx 90 1780
MP1-390-xxx 100 1780