|
|
THE
SP SILENCER
For Maximum Noise Reduction
The
SP Exhaust Silencer is a single pass silencer designed to give
maximum attenuation of both low and high frequency noise for
air, steam, or gas exhausting to atmosphere.
The gas enters the inlet of the silencer where the flow is disbursed
through the inlet diffuser tube into hundreds of small jet flows.
This provides for quite flow of the gas into the silencer and
the first stage silencing chamber. The diffuser also directs
the flow toward the outer walls of the silencer body. The gas
then repeats the same process contracting and expanding into
the second storage chamber. The second chamber reacts with the
noise the same way as the fist chamber dissipating and absorbing
the noise that is left over. The second chamber also has an
important function as a reflow area. It allows for an even flow
of gas to the outlet. This assures the quiet release of gases
to the atmosphere through an adequately sized outlet.
The first and second absorption chambers are lined with 1/2"
Dalcon Acoustical Material protected by perforated plate. The
perforated plate creates a dimple effect on the acoustical material.
This feature is similar to dimpled acoustical tile. It is this
design that is very efficient in absorbing medium and high frequency
noise. Besides the absorption material please note the strategically
placed dissipative chamber openings on the perforated plate
where there is no acoustical material. These areas are specifically
designed to absorb low frequency noise. This means the silencer
will work for both low and high frequency noise.
Each silencer reduces noises differently. The larger the size,
the higher the reduction. These reductions range from 34.9 to
48.4dB. The following page gives these combined reductions as
well as reductions at various frequencies.
Both the SP and SP-S Silencer are designed to take high inlet
velocities of 900 fps. So they make excellent exhaust Silencers.
The acoustical material "Dalcon" is rated for 1250
deg. F so that this silencer works well on steam conditions.
The SP and SP-S Exhaust Silencers have the same quality of workmanship
that has gone into all Penn Products for so many years and is
guaranteed for a year against defects in materials or workmanship.
For maximum noise reduction choose Penn's SP Exhaust Silencer. |
|
SP Silencer - Attenuation Levels on Steam
|
Frequency |
31.5
|
63
|
125
|
250
|
500
|
1K
|
2K
|
4K
|
8K
|
16K
|
Combined
|
SP 2-14 |
1.6
|
1.4
|
6.9
|
11.0
|
22.8
|
32.0
|
37.9
|
40.6
|
36.8
|
26.9
|
34.9
|
SP 2.5-14 |
2.9
|
3.3
|
5.6
|
10.5
|
22.0
|
30.9
|
38.0
|
41.3
|
39.5
|
27.6
|
36.5
|
SP 3-18 |
3.5
|
4.0
|
4.9
|
11.5
|
21.8
|
34.0
|
39.0
|
43.5
|
40.0
|
28.0
|
36.8
|
SP 4-20 |
4.3
|
4.6
|
4.7
|
14.5
|
22.4
|
31.6
|
40.4
|
41.5
|
37.9
|
30.0
|
38.2
|
SP 5-24 |
5.0
|
4.9
|
5.0
|
15.5
|
25.4
|
35.1
|
42.2
|
43.4
|
40.4
|
28.1
|
38.4
|
SP 6-24 |
6.1
|
4.8
|
5.5
|
17.1
|
25.4
|
32.8
|
40.6
|
45.0
|
42.6
|
31.8
|
39.9
|
SP 8-30 |
8.8
|
3.7
|
6.4
|
15.4
|
28.0
|
36.2
|
42.4
|
44.5
|
42.1
|
32.9
|
41.8
|
SP 10-36 |
9.2
|
3.6
|
7.6
|
15.2
|
28.0
|
34.8
|
42.2
|
46.2
|
43.1
|
31.3
|
42.0
|
SP 12-42 |
10.4
|
4.2
|
11.4
|
19.3
|
27.4
|
36.6
|
42.8
|
48.5
|
42.9
|
34.2
|
43.7
|
SP 14-48 |
11.1
|
5.3
|
12.9
|
21.7
|
28.3
|
38.5
|
45.0
|
47.0
|
43.9
|
35.5
|
45.2
|
SP 16-48 |
11.2
|
5.8
|
15.1
|
19.4
|
29.3
|
39.0
|
44.4
|
50.2
|
44.7
|
34.3
|
46.5
|
SP 18-48 |
11.2
|
5.9
|
15.3
|
19.4
|
32.2
|
39.9
|
45.7
|
49.0
|
48.6
|
37.7
|
47.0
|
SP 20-54 |
11.3
|
5.9
|
15.3
|
19.0
|
32.1
|
40.6
|
48.7
|
50.7
|
45.3
|
36.8
|
48.4
|
SP 24-54 |
11.3
|
5.9
|
15.3
|
19.0
|
32.1
|
40.6
|
48.7
|
50.7
|
45.3
|
36.8
|
48.4
|
SP Silencer - Attenuation Levels on Air
|
Frequency |
31.5
|
63
|
125
|
250
|
500
|
1K
|
2K
|
4K
|
8K
|
16K
|
Combined
|
SP 2-14 |
1.9
|
2.2
|
5.1
|
9.8
|
22.3
|
29.3
|
37.4
|
41.7
|
38.5
|
27.3
|
34.9
|
SP 2.5-14 |
3.6
|
3.6
|
3.7
|
14.2
|
24.1
|
33.5
|
39.8
|
43.7
|
40.4
|
29.3
|
36.4
|
SP 3-18 |
4.3
|
3.5
|
4.0
|
14.9
|
25.2
|
30.6
|
40.9
|
44.3
|
40.3
|
27.2
|
36.8
|
SP 4-20 |
5.3
|
3.0
|
3.7
|
16.1
|
22.1
|
34.4
|
40.0
|
41.3
|
39.4
|
30.0
|
38.1
|
SP 5-24 |
6.0
|
2.4
|
3.4
|
13.5
|
23.0
|
32.2
|
39.6
|
44.2
|
41.2
|
30.3
|
38.3
|
SP 6-24 |
7.1
|
1.6
|
5.3
|
13.3
|
26.4
|
31.9
|
42.5
|
42.7
|
41.3
|
28.2
|
39.7
|
SP 8-30 |
8.4
|
2.6
|
10.3
|
19.1
|
25.1
|
36.2
|
43.9
|
47.2
|
44.4
|
33.4
|
41.7
|
SP 10-36 |
8.3
|
2.8
|
11.2
|
18.5
|
25.4
|
36.0
|
42.8
|
45.0
|
43.0
|
31.4
|
41.5
|
SP 12-42 |
7.9
|
2.6
|
11.0
|
16.3
|
27.5
|
37.9
|
44.5
|
45.9
|
43.3
|
35.0
|
43.6
|
SP 14-48 |
7.3
|
3.7
|
9.8
|
21.1
|
30.2
|
37.3
|
47.0
|
50.2
|
46.7
|
33.4
|
45.1
|
SP 16-48 |
7.3
|
6.7
|
9.8
|
19.9
|
29.4
|
37.6
|
44.6
|
51.1
|
47.4
|
34.0
|
46.5
|
SP 18-48 |
7.5
|
8.6
|
10.7
|
19.3
|
31.8
|
38.3
|
49.0
|
51.2
|
47.9
|
34.0
|
46.8
|
SP 20-54 |
7.4
|
7.5
|
9.8
|
18.8
|
31.8
|
41.1
|
48.4
|
50.2
|
44.9
|
35.0
|
46.7
|
SP 24-54 |
7.4
|
7.5
|
9.8
|
18.8
|
31.8
|
41.1
|
48.4
|
50.2
|
44.9
|
35.0
|
46.7
|
THE
SP-S SILENCER
For Good Noise Reduction
The
SP-S Exhaust Silencer is also a single pass silencer designed
to give good attenuation of both low and high frequency noise
for air, steam, or gas exhausting to atmosphere.
The SP-S Silencer is an economical approach to silencing where
the noise level reduction does not have to be as great as the
SP model. The SP-S Silencer has the same physical configurations
as the SP Silencer except that it is two-thirds the length of
an SP Silencer.
The gas enters the inlet of the silencer where the fIow is disbursed
through the inlet diffuser tube into hundreds of small jet flows.
This provides for a quiet flow of the gas into the silencer
and the first stage silencing chamber. The diffuser also directs
the flow toward the outer walls of the silencer body. The gas
then repeats the same process contracting and expanding into
the second stage chamber. The second chamber reacts with the
noise the same way as the first chamber dissipating and absorbing
the noise that is left over. The second chamber also has an
important function as a reflow area. It allows for an even flow
of gas to the outlet. This assures the quiet release of gases
to the atmosphere through an adequately sized outlet.
The first and second absorption chambers are lined with 1/2"
Dalcon Acoustical Material protected by perforated plate. The
perforated plate creates a dimple effect on the acoustical material.
This feature is similar to dimpled acoustical tile. It is this
design that is very efficient in absorbing medium and high frequency
noise. Besides the absorption material please note the strategically
placed dissipative chamber openings on the perforated plate
where there is no acoustical material. These areas are specifically
designed to absorb low frequency noise. This means the silencer
will work for both low and high frequency noise.
Each silencer reduces noise differently. The larger the size,
the higher the reduction. These reductions range from 24.4 to
29.7 dB. The following page gives these combined reductions
as well as reductions at various frequencies.
Both the SP and SP-S Silencer are designed to take high inlet
velocities of 900 fps. so they make excellent exhaust Silencers.
The acoustical material "Dalcon" is rated for 1250
deg. F so that this silencer works well on steam conditions.
The SP and SP-S Exhaust Silencers have the same quality of workmanship
that has gone into all Penn Products for so many years and is
guaranteed for a year against defects in materials or workmanship.
For good noise reduction choose Penn's SP-S Exhaust Silencer. |
|
SP-S Silencer - Attenuation Levels on Steam
|
Frequency |
31.5
|
63
|
125
|
250
|
500
|
1K
|
2K
|
4K
|
8K
|
16K
|
Combined |
SP 2-14-S |
0.4
|
-0.1
|
3.5
|
8.7
|
13.1
|
21.2
|
25.1
|
25.9
|
24.3
|
17.8
|
24.4
|
SP 2.5-14-S |
1.0
|
0.9
|
4.5
|
7.3
|
15.0
|
21.0
|
24.7
|
26.7
|
24.0
|
19.0
|
24.7
|
SP 3-18-S |
1.6
|
1.7
|
4.2
|
7.3
|
16.3
|
20.0
|
26.6
|
28.1
|
26.7
|
18.8
|
25.9
|
SP 4-20-S |
1.4
|
1.5
|
4.4
|
7.4
|
15.9
|
21.3
|
24.8
|
27.2
|
26.0
|
19.1
|
25.8
|
SP 5-24-S |
1.9
|
2.1
|
3.8
|
6.9
|
14.9
|
20.0
|
24.5
|
29.0
|
25.3
|
18.9
|
26.0
|
SP 6-24-S |
2.6
|
2.8
|
3.1
|
8.6
|
14.0
|
21.1
|
26.0
|
27.5
|
25.4
|
18.7
|
25.7
|
SP 8-30-S |
3.2
|
3.2
|
3.3
|
10.3
|
16.8
|
23.2
|
28.0
|
29.3
|
26.3
|
19.3
|
27.0
|
SP 10-36-S |
3.3
|
3.2
|
3.3
|
10.3
|
16.8
|
23.2
|
27.9
|
28.7
|
26.8
|
18.6
|
26.5
|
SP 12-42-S |
4.0
|
3.2
|
3.6
|
11.3
|
16.8
|
21.7
|
26.9
|
29.8
|
28.2
|
21.0
|
27.3
|
SP 14-48-S |
4.4
|
3.1
|
3.6
|
11.8
|
15.5
|
24.1
|
28.8
|
29.6
|
26.2
|
20.5
|
27.7
|
SP 16-48-S |
5.7
|
2.5
|
3.9
|
10.1
|
18.4
|
24.2
|
27.6
|
31.0
|
28.9
|
20.5
|
28.6
|
SP 18-48-S |
6.4
|
2.5
|
6.2
|
10.1
|
16.8
|
25.7
|
30.0
|
29.7
|
29.5
|
22.4
|
29.2
|
SP 20-54-S |
6.3
|
2.4
|
5.6
|
9.9
|
17.3
|
23.7
|
27.9
|
29.9
|
28.4
|
20.7
|
29.6
|
SP 24-54-S |
6.3
|
2.4
|
5.6
|
9.9
|
17.3
|
23.7
|
27.9
|
29.9
|
28.4
|
20.7
|
29.6
|
SP-S Silencer - Attenuation Levels on Air
|
Frequency |
31.5
|
63
|
125
|
250
|
500
|
1K
|
2K
|
4K
|
8K
|
16K
|
Combined |
SP 2-14-S |
0.5
|
0.2
|
4.0
|
7.1
|
13.0
|
19.0
|
25.7
|
25.4
|
25.4
|
16.5
|
24.7
|
SP 2.5-14-S |
1.2
|
1.4
|
3.4
|
6.5
|
14.9
|
19.5
|
25.2
|
27.4
|
24.5
|
16.8
|
25.6
|
SP 3-18-S |
1.9
|
2.2
|
2.4
|
8.1
|
13.3
|
19.9
|
26.4
|
28.4
|
26.5
|
18.5
|
25.9
|
SP 4-20-S |
1.7
|
2.0
|
2.5
|
7.3
|
13.6
|
21.9
|
24.2
|
28.4
|
24.6
|
18.4
|
25.7
|
SP 5-24-S |
2.3
|
2.4
|
2.4
|
9.3
|
15.7
|
21.2
|
25.6
|
27.0
|
25.5
|
18.9
|
25.1
|
SP 6-24-S |
3.2
|
2.2
|
2.7
|
10.6
|
15.3
|
20.7
|
24.8
|
28.4
|
25.6
|
18.4
|
26.6
|
SP 8-30-S |
3.9
|
1.6
|
2.2
|
9.1
|
14.8
|
20.9
|
27.0
|
27.4
|
26.1
|
19.3
|
27.0
|
SP 10-36-S |
4.0
|
1.6
|
2.2
|
9.0
|
15.2
|
21.3
|
26.2
|
29.3
|
27.3
|
20.1
|
26.6
|
SP 12-42-S |
4.7
|
1.1
|
3.5
|
8.8
|
17.5
|
21.1
|
28.1
|
28.3
|
27.4
|
18.7
|
27.2
|
SP 14-48-S |
5.0
|
1.0
|
4.7
|
8.6
|
15.3
|
24.2
|
28.4
|
29.2
|
27.9
|
20.2
|
27.5
|
SP 16-48-S |
5.5
|
1.6
|
6.6
|
12.2
|
18.0
|
22.8
|
27.1
|
31.0
|
29.1
|
19.7
|
28.6
|
SP 18-48-S |
5.4
|
1.9
|
8.1
|
10.6
|
18.8
|
24.5
|
29.0
|
31.1
|
29.5
|
22.1
|
29.1
|
SP 20-54-S |
5.5
|
1.9
|
7.8
|
11.3
|
16.9
|
22.5
|
28.9
|
30.0
|
28.1
|
22.3
|
29.7
|
SP 24-54-S |
5.5
|
1.9
|
7.8
|
11.3
|
16.9
|
22.5
|
28.9
|
30.0
|
28.1
|
22.3
|
29.7
|
 
|
DIMENSIONS
- SP AND SP-S SILENCER
SPECIFICATION PRINT
EXHAUST SILENCER
SP Silencer |
Dimensions
|
Model |
I
|
D
|
O
|
H
|
PL Min. |
SP 2-14 |
2
|
14
|
5
|
60
|
7 Ga.
|
SP 2.5-14 |
2 1/2
|
14
|
6
|
84
|
7 Ga.
|
SP 3-18 |
3
|
18
|
8
|
96
|
7 Ga.
|
SP 4-20 |
4
|
20
|
10
|
108
|
7 Ga.
|
SP 5-24 |
5
|
24
|
12
|
120
|
7 Ga.
|
SP 6-24 |
6
|
24
|
14
|
135
|
7 Ga.
|
SP 8-30 |
8
|
30
|
18
|
180
|
7 Ga.
|
SP 10-36 |
10
|
36
|
24
|
195
|
7 Ga.
|
SP 12-42 |
12
|
42
|
30
|
216
|
1/4"
|
SP 14-48 |
14
|
48
|
30
|
252
|
1/4"
|
SP 16-48 |
16
|
48
|
36
|
276
|
1/4"
|
SP 18-48 |
18
|
48
|
42
|
288
|
1/4"
|
SP 20-54 |
20
|
54
|
48
|
288
|
1/4"
|
SP 24-54 |
24
|
54
|
48
|
288
|
1/4"
|
|
SP-S Silencer |
Dimensions
|
Model |
I
|
D
|
O
|
H
|
PL Min.
|
SP 2-14-S |
2
|
14
|
5
|
40
|
7 Ga.
|
SP 2.5-14-S |
2 1/2
|
14
|
6
|
56
|
7 Ga.
|
SP 3-18-S |
3
|
18
|
8
|
64
|
7 Ga.
|
SP 4-20-S |
4
|
20
|
10
|
72
|
7 Ga.
|
SP 5-24-S |
5
|
24
|
12
|
80
|
7 Ga.
|
SP 6-24-S |
6
|
24
|
14
|
90
|
7 Ga.
|
SP 8-30-S |
8
|
30
|
18
|
120
|
7 Ga.
|
SP 10-36-S |
10
|
36
|
24
|
130
|
7 Ga.
|
SP 12-42-S |
12
|
42
|
30
|
144
|
1/4"
|
SP 14-48-S |
14
|
48
|
30
|
168
|
1/4"
|
SP 16-48-S |
16
|
48
|
36
|
184
|
1/4"
|
SP 18-48-S |
18
|
48
|
42
|
192
|
1/4"
|
SP 20-54-S |
20
|
54
|
48
|
192
|
1/4"
|
SP 24-54-S |
24
|
54
|
48
|
192
|
1/4"
|
|
"DALCON"
- AN EFFECTIVE
ACOUSTICAL MATERIAL
An acoustical material which absorbs 90% of the sound energy has an
absorption coefficient of .9. We tested "Dalcon" under different
conditions - up to 50% saturated with moisture. This is important
because in operation a Silencer can get wet. Under these wet conditions
acoustical material can lose its sound absorbing qualities. "Dalcon"
has an absorption coefficient of .9 on noise with a frequency above
1400Hz. It will absorb 50% of the noise down to 800Hz. This is important
because a predominate amount of the noise on exhaust conditions is
medium and high frequency noise. We protect the acoustical material
with perforated plate with 1/8" dia. Holes. This serves two purposes:
prevents the erosion of the acoustical material by the gases flowing
through the Silencer and helps reduce the noise level by providing
a dimple effect that one finds on acoustical ceiling tile. "DaIcon"
also has a good temperature rating, 1250°F, which makes it ideal
for Steam Silencers. |
|
HOW
TO DETERMINE YOUR
NOISE LEVEL REDUCTION
We know that for each model Exhaust Silencer a level of reduction
is produced. These reductions are stated on the previous pages. The
Silencers will reduce the initial noise by the rated reductions listed
for each model. The best way to get initial noise levels is by taking
actual levels. This level less the silencers rated reduction will
equal the final noise level. The initial noise level for this method
can be taken at any location. The final level would be the level at
this same location. Once a noise level is known for one location other
locations can be calculated. It is a rule in acoustics that for every
doubling of distance away from the noise source the noise can be reduced
by another 3 dB (in a semi-reverberant field-buildings near by) and
6 dB in a free field (unobstructed). So by doubling the distance that
levels are made estimates of final levels at other locations can be
established. Estimates of noise levels can be made when actual noise
levels cannot be taken. Information about these calculations is contained
in our engineering brochure E-2 Exhaust Noise and Penn Silencers.
These estimated levels along with the silencers rated reduction will
give estimated final noise levels. Using a Penn Silencer will bring
noise on most applications to within required levels. |
|
