Sound Pressure Level - Grundfos NB Installation And Operating Instructions Manual

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:
4-pole:
6-pole:
Maximum sound pressure level
[dB(A)] - ISO 3743
Motor [kW]
Three-phase motors
2-pole
0.25 56
0.37 56
0.55 57
0.75 56
1.1 59
1.5 58
2.2 60
3 59
4 63
5.5 63
7.5 60
11 60
15 60
18.5 60
22 66
30 71
37 71
45 71
55 71
75 73
90 73
110 76
132 76
160 76
200 76
250 82
-1
n = 2900 min
-1
n = 1450 min
-1
n = 970 min
4-pole 6-pole
41 -
45 -
42 40
42 43
50 43
50 47
52 52
52 63
54 63
57 63
58 66
60 66
60 66
63 66
63 66
65 59
66 60
66 58
67 58
70 61
70 61
70 61
70 61
70 65
70 -
73 -
Maximum sound pressure level
[dB(A)] - ISO 3743
Motor [kW]
Three-phase motors
2-pole
315 82
355 77
400 -
60 Hz motor
2-pole:
4-pole:
6-pole:
Maximum sound pressure level
[dB(A)] - ISO 3743
Motor [kW]
Three-phase motors
2-pole
0.25 -
0.37 -
0.55 -
0.75 -
1.1 64
1.5 64
2.2 65
3 54
4 68
5.5 68
7.5 73
11 70
15 70
18.5 70
22 70
30 71
37 71
45 75
55 75
75 77
90 77
110 81
132 81
4-pole 6-pole
73 -
75 -
75 -
-1
n = 3500 min
-1
n = 1750 min
-1
n = 1170 min
4-pole 6-pole
- -
- -
- -
- -
51 -
52 62
55 60
57 67
56 67
62 67
62 70
66 70
66 57
63 57
63 59
65 59
65 61
65 64
68 64
71 63
71 63
75 62
75 62
43