Flowserve MJ Slurry - Manual (Page 10)

MJ SLURRY USER INSTRUCTIONS ENGLISH 71569294 - 02/08
Page 10 of 54
®
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.
M SLURRY
pump size
Noise Level dbA
(at 1 m (3 ft) reference 20 µPa)
Pump speed
rpm
Sound Power
Level dbA
2.5 MJ091 75 2250 89
3 MJ091 75 2250 89
3 MJ111 77 2000 91
4 MJ121 77 1300 91
5 MJ141 78 1180 92
4 MJ122 80 1780 94
5 MJ142 80 1600 94
6 MJ162 77 1180 91
8 MJ192 78 1000 92
6 MJ163 81 1350 95
8 MJ193 82 1180 96