Flowserve DMXD User Manual

DMX/DMXD/DMXH/DMXD
H
USER
INSTRUCTIONS
ENGLISH
71569282
-
10/09
Page 8 of 60
Oil lubricated units only:
1.8
Specific
machine
performanc
e
For performance parameters see 10.4
Customer
Data Sheet.
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
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 hav
e 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.
1.9.1
Pump
noise
levels
The following tables may be used to determine the
estimated sound pressure levels (SPL), expressed in
dBA
(dB), for
DMX/DMXD/DMXH/DMXDH pumps.
The values shown have been derived from actual
noise test data and are based on the following
conditions:
a)
Equipment is
located in
a
free field
above
a
reflecting plane in which the reduction in noise
level in all directions is 6 dB in each octave band
for each doubling of distance.
b)
Background
noise is
10 dB
(minimum) below
all
noise levels in each octave band.
c)
The
values
shown a
re at
a distance
of 1
m
(3.281 ft), horizontally from major pump surfaces
and 1.5 m (4.78 ft) above the floor using the
standard pressure reference of 20 µPa
(0.00002 N/m
2
).
d)
Overall
noise
level,
dBA
("A" scale
) is
determined
at points of maximum noise level, and the values
of all mid-band frequencies are basis "C" scale
readings.
1.9.2
Overall
noise
level
Tables below show dBA levels for two stage and
three or more stage pumps, based on the best
efficiency point BEP at design RPM and required
impeller diameter.
For specific gravities less than 1.0, use 1.0 specific
gravity.
For specific g
ravities above
1.0, use
the
actual specific gravity.
When the required condition flow falls outside the
range of 75% to 125% of BEP, a Part Load
Correction (PLC) must be added to the noise levels
as follows:
Percent of BEP at required Impeller
Diameter
PLC DB
74
to
62
%
or
126
to
136
%
+1
61
to
50
%
or
137
to
150
%
+2
49
to
38
%
+3
37
to
25
%
+4
Brake Horse Power at
Best Efficiency
Point.
dBA
2 Stage pump
250
to
350
87
350
to
500
88
500
to
700
89
700
to
940
90
940
to
1100
91
1100
to
1300
92
1300
to
1500
93
Above
1500,
contact
Flowserve
94

Flowserve DMXD Specifications

General

Brand	Flowserve
Model	DMXD
Category	Water Pump
Language	English