Fig. 1

 

Fig. 2

Which Type of Silencer to Choose

The selection of the best suited silencer is based on:

  • AERODYNAMIC PROPERTIES – (BxH)
  • ACOUSTIC – (L)
  • AERODYNAMIC PROPERTIES: the size of section BxH can be calculated using Figure 3 modeling of air flow capacity as function of the head loss.
  • ACOUSTIC PROPERTIES: the values of noise mitigation per octave bands of the Series S 200/100 silencers vary depending on the length and can be calculated with the diagram in Figure 5.

For noise remediation requirements different than those indicated in the diagram, we can provide silencers’ dissipative elements with different thickness.

 

Example

For an air duct with flow capacity of 20.000 m 3 / h and with maximum head loss of 10 mm. H2 0, Figure 3 diagram indicates a silencer type S202/100 (BxH = 800 x 1000 mm.).
If the noise abatement required is greater than 25dB at the octave frequency of 250 Hz then Figure 5 indicates the usage of a silencer with L = 1500 mm.

 

Head loss

Fig. 3

List of standard types

 

B H L = 1000 L = 1500 L = 2000 L = 2500 L = 3000
400 1000 S 201/100/1000 S 201/100/1500 S 201/100/2000 S 201/100/2500 S 201/100/3000
800 1000 S 202/100/1000 S 202/100/1500 S 202/100/2000 S 202/100/2500 S 202/100/3000
1200 1000 S 203/100/1000 S 203/100/1500 S 203/100/2000 S 203/100/2500 S 203/100/3000
1600 1000 S 204/100/1000 S 204/100/1500 S 204/100/2000 S 204/100/2500 S 204/100/3000
1200 2000 S 205/100/1000 S 205/100/1500 S 205/100/2000 S 205/100/2500 S 205/100/3000
1600 2000 S 206/100/1000 S 206/100/1500 S 206/100/2000 S 206/100/2500 S 206/100/3000
1800 2000 S 207/100/1000 S 207/100/1500 S 207/100/2000 S 207/100/2500 S 207/100/3000
2000 2000 S 208/100/1000 S 208/100/1500 S 208/100/2000 S 208/100/2500 S 208/100/1000
2024000 2000 S 209/100/1000 S 209/100/1500 S 209/100/2000 S 209/100/2500 S 209/100/3000

 

Fig. 4

Dimensions in mm

Noise mitigation

Fig. 5

 

General properties

 

Maximum Temperatures: 600° C
Fire reaction: fire proof
Vibration resistance: excellent
Humidity resistance: excellent
Steam and gas resistance: excellent

These silencers’ characteristics are merely indicative. Alfakel retains the rights to apply further modifications.

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