Flowserve MSP User Manual
Page 10
MSP USER INSTRUCTIONS ENGLISH - 07/14
Page 10 of 35
dB(A) Value
63
125
250
500
1K
2K
4K
8K
4000 rpm
70
64
64
62
62
60
55
50
50
5000 rpm
72
62
66
66
64
64
64
62
57
6000 rpm
76
70
70
68
68
66
61
56
56
7000 rpm
78
68
72
72
70
70
70
68
63
8000 rpm
80
70
74
74
72
72
72
70
65
Sound pressure readings are for information only and are not subject to guarantee by Flowserve.
Decibel readings do not include driver or system noise.
Pump tested at 100% of the best efficiency point at max.impeller diameter with water.
dB correction for combining noises (pump+motor)
Difference between two
levels to be combined, dB
Add to the higher level to obtain
the combined noise level,dB
Note :
1) The values showed are measured at a distance of 1 mt. (horizontally) from major pump
surfaces and 1.5 mt. above the floor.
2) The values shown are expressed in dB.
3) For Noise Test Procedure refer to Works Standard L-109-0
4) The values shown have been derived from actual noise-test data and are based on the following conditions:
- Equipment is located in a free field above a reflecting plane in which the reductionin noise level
in all directions is 6db in each octave band for each doubling of distance.
- Background noise is 10dB minimum below all noise levels in each octave band.
- The values shown are at a distance of 1 meter (horizontally) from the major pump surface and
1,5 meters above the floor, using a standard pressure reference of 0,00002 newton per square meter.
- Overall noise level, dB(A) is determined at points of maximum noise level and the values of all
mid-band frequences are basis A scale readings.
When the required condition flow is outside the range of 75 to 125% BEP, a part load correction (PLC) must be
added to the noise level as follows:
Percent of BEP @ required
impeller diameter
PLC in
dB
74 to 62 or 126 to 136
+1
61 to 50 or 137 to 150
+2
+3
+4
37 to 25
1
0.5
0
49 to 38
3
2.5
2
1.5
Octave MID_BAND Frequency, HZ
0
1
2
4
6
9
10