Flowserve Worthington WXB User Manual
Page 10
WXB USER INSTRUCTIONS ENGLISH - 07/14
Page 10 of 51
Power B [HP]
Power [kW]
dB(A) Value
63
125
250
500
1 K
2 K
4 K
8 K
53.7
40
77
67
71
71
69
69
69
67
62
70
52
78
68
72
72
70
70
70
68
63
91.2
68
79
69
73
73
71
71
71
69
64
119.4
89
80
70
74
74
72
72
72
70
65
157
117
81
71
75
75
73
73
73
71
66
206.7
154
82
72
76
76
74
74
74
72
67
269.7
201
83
73
77
77
75
75
75
73
68
354.3
264
84
74
78
78
76
76
76
74
69
464.3
346
85
75
79
79
77
77
77
75
70
609.3
454
86
76
80
80
78
78
78
76
71
798.5
595
87
77
81
81
79
79
79
77
72
1046.8
780
88
78
82
82
80
80
80
78
73
1372.9
1023
89
79
83
83
81
81
81
79
74
Sound pressure readings are for information only and are not subject to guarantee by Flowserve/IDP.
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)
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 (A)
3) For Noise Test Procedure refer to Works Standard L-109
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.
5) Above values are given for 2950 RPM.
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
49 to 38
+3
37 to 25
+4
1
0.5
0
3
2.5
2
1.5
levels to be combined, dB
Difference between two
Octave MID BAND frequency [Hz]
0
1
2
4
6
9
10