Grundfos NB - Sound Pressure Level

13.3 Sound pressure level
The data in this table applies for pumps including
motor, such as MG, MMG and Siemens motors.
The values stated are maximum sound pressure
levels. Tolerances are according to ISO 4871.
50 Hz motor
2-pole:
n = 2900 min
-1
4-pole:
n = 1450 min
-1
6-pole:
n = 970 min
-1
Motor [kW]
Maximum sound pressure level
[dB(A)] - ISO 3743
Three-phase motors
2-pole 4-pole 6-pole
0.25 56 41 -
0.37 56 45 -
0.55 57 42 40
0.75 56 42 43
1.1 59 50 43
1.5 58 50 47
2.2 60 52 52
3 59 52 63
4 63 54 63
5.5 63 57 63
7.5 60 58 66
11 60 60 66
15 60 60 66
18.5 60 63 66
22 66 63 66
30 71 65 59
37 71 66 60
45 71 66 58
55 71 67 58
75 73 70 61
90 73 70 61
110 76 70 61
132 76 70 61
160 76 70 65
200 76 70 -
250 82 73 -
Motor [kW]
Maximum sound pressure level
[dB(A)] - ISO 3743
Three-phase motors
2-pole 4-pole 6-pole
315 82 73 -
355 77 75 -
400 - 75 -
60 Hz motor
2-pole:
n = 3500 min
-1
4-pole:
n = 1750 min
-1
6-pole:
n = 1170 min
-1
Motor [kW]
Maximum sound pressure level
[dB(A)] - ISO 3743
Three-phase motors
2-pole 4-pole 6-pole
0.25 - - -
0.37 - - -
0.55 - - -
0.75 - - -
1.1 64 51 -
1.5 64 52 62
2.2 65 55 60
3 54 57 67
4 68 56 67
5.5 68 62 67
7.5 73 62 70
11 70 66 70
15 70 66 57
18.5 70 63 57
22 70 63 59
30 71 65 59
37 71 65 61
45 75 65 64
55 75 68 64
75 77 71 63
90 77 71 63
110 81 75 62
132 81 75 62
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