The noise of a working pump can be divided into basic noises determined by design features and additional noises that arise during operation.
Both basic sources of noise in a pump are related to the rotational frequency and power of the electric motor. The European standard ISO 3743 limits the noise emitted by the pump during operation depending on the power and rotational frequency of the electric motor.
Power |
2900 rpm |
1450 rpm |
960 rpm |
0.25 |
56 |
41 |
- |
0.37 |
56 |
45 |
- |
0.55 |
57 |
42 |
40 |
0.75 |
56 |
42 |
43 |
1.10 |
59 |
50 |
43 |
1.50 |
58 |
50 |
47 |
2.20 |
60 |
52 |
52 |
3.00 |
59 |
52 |
63 |
4.00 |
63 |
54 |
63 |
5.50 |
63 |
62 |
63 |
7.50 |
68 |
62 |
66 |
11.0 |
70 |
66 |
66 |
15.0 |
70 |
66 |
66 |
18.5 |
70 |
63 |
66 |
22.0 |
70 |
63 |
66 |
30.0 |
71 |
65 |
59 |
37.0 |
71 |
66 |
60 |
45.0 |
71 |
66 |
58 |
55.0 |
71 |
67 |
58 |
75.0 |
73 |
70 |
61 |
It is important to remember that an increase in sound pressure by 6 dB(A) is equivalent to doubling the noise level. For example, increasing the sound pressure from 40 to 46 dB(A) is equivalent to doubling the noise level, and from 40 to 52 dB(A) is equivalent to quadrupling it.
As can be seen from the table above, the noise generated by a pump is closely related to the rotational speed of the impeller, so it can only be influenced by reducing the rotational speed. However, reducing the rotational speed also reduces the pump's productivity, so installing a frequency controller can have a significant effect if the pump is selected with a large power reserve, as well as in systems with peak water consumption.
The issue of reducing pump noise has become relevant with the appearance of boiler rooms and heat points in residential buildings equipped with circulation pumps for heating systems and booster pumps for water supply systems.
According to existing building codes, the heat point room should not be adjacent to residential premises, but architects often turn a blind eye to this during the design phase.
The predominant noise in an apartment can be not the basic noise from the pump in the basement, but the noise transmitted through enclosing structures from the vibration of pipelines and through the pump foundation.
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