|
Vent
Silencers are used to attenuate noise produced by the expansion
of gas or steam from elevated pressures to atmospheric pressure.
Vent silencers serve a two fold purpose:
· Work
place noise levels are reduced to a desired occupational noise
exposure.
· Intrusion
of industrial noise into residential areas is held to an
acceptable level.
The overall
envelope size of a vent silencer is directly proportional to the
flow rate of the particular gas and desired noise reduction.
Noise reduction is a characteristic function of the silencer
length whereas the width or diameter is related to the gas flow
rate. The size of any vent silencer is determined by the maximum
flow velocity through the silencer. A maximum velocity is set to
ensure structural integrity and minimize the sub-sonic jet noise
at the silencer discharge.
Vent
silencers are effective in reducing high frequency noise because
they force the flow to go through absorptive acoustical packing,
which takes some of the energy out of the stream, thus reducing
the noise. Think of an army of soldiers marching across a field
and throwing a stream of water in front of them. As they cross
through the water, they are slowed down and lose energy from
having to fight through the resistance of the water. The flow
going through the packed panels does the same thing to the noise
from the high velocity gas. In some cases, we even oversize the
diameter of the silencer and add packing in order to force the
flow to go through more packing and increase the attenuation.
The most
important design aspect of the vent silencer is the inlet
diffuser. The diffuser is effective in distributing the flow
evenly through all of the panels in the silencer. It can also be
designed to restrict a back pressure upon any valve you may have
upstream of the silencer. |
Intake Silencers
Maxim offers a line of intake silencers for all
applications, large and small. From blowers and air compressors to gas
and steam turbines, we can provide the best sound attenuation available.
We clean all of our intake silencers of weld slag and debris, and use
stainless steel for air supply within bariatric chambers.
Maxim’s absorptive FPC and FPS silencers are ideal
companions for fan intake and discharges and centrifugal compressor
inlets. These sister silencers offer the purchaser the degree of
silencing desired in a package size for a particular location. The FPC
is an economical compromise in providing a small package size for
controlling high frequency noise. A majority of all noise control
requirements can be satisfied with this advanced acoustical design.
Where low pressure drop and critical noise control are required in a
single package, the FPS fills the bill. |
|
Inline Silencers
Noise
generated by pressure reducing valves and compressors is transmitted to
the workplace and nearby community through the transmission system
piping. Reduction of this noise by industrial inline silencers has
proven to be the most practical and efficient method. Maxim’s IL
silencer series can be used upstream and downstream of a pressure
reducing valve, and in the compressor discharge piping. The ILL and ILM
product lines offer flexibility to select the best compromise in price,
package size, pressure drop and noise reduction. Maxim’s decades of
experience in solving these noise problems has taken the guessing out of
providing a durable, reliable and superior installation.
Pictured: Maxim Model ILL Inline Service Silencer |
|
|
Model |
Description |
Uses |
|
Intake Silencers |
FP
FPE |
Straight through, absorptive silencer design with
no center panel for low pressure drop service. Expected
attenuation is 20 dBA. |
Internal combustion engine intakes, compressor
intakes, fan intakes & discharges |
FPC
FPCE |
Similar to the FPE but with an internal center
panel which displaces part of the nominal flow area. Pressure
drop is higher but the FPC is more compact in diameter, length
and weight. Available in sizes 14" and up, the FPC is excellent
for engine and compressor intakes and fan intakes and
discharges. Expected attenuation is 20 to 25 dBA. |
Internal combustion engine intakes, compressor
intakes, fan intakes & discharges |
FPS
FPSE |
Designed with a center panel, the FPS / FPSE body
diameter is enlarged to enable an annular flow passage equal to
the full nominal flow area. Pressure drop is intermediate
between the FP and FPC models. Expected attenuation is 15 to 30
dBA. |
Internal combustion engine intakes, compressor
intakes, fan intakes & discharges |
|
Inline Silencers |
ILL
ILM |
Provide good silencing when properly installed
with pressure reducing valves and on centrifugal compressor
discharges. These silencers are fabricated in accordance with
ASME Boiler and Pressure Vessel Code, Section VIII, Division I. |
Pressure reducing valves,
centrifugal compressor discharges |
|
Note: The M series and
the MUL model can be cleaned and designated for intake service
on request.
The Intake models with the "E" designation are for exhaust only
applications |
|
Optional Accessories |
- Companion flanges
- Flexible connectors
- Safety Covers
- Diverter Tees
- Rain Caps
- Various support arrangements
- Special insulation
- Special paints
|
Please consult the separate
accessories brochure for more information and options |
|
