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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:
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.
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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. |
Pictured: 94" VT-3 for service in Mexico |
|
Model |
Description |
Uses |
|
VT-S |
For relatively small vent applications, the VT-S
offers impressive silencing of the noise associated with steam
or gas vents. The VT-S has a very high performance to cost
ratio. |
Steam ejectors, small steam or
gas vents, small safety relief valves |
|
VT-1 |
For impressive silencing of high frequency noise
associated with steam or gas vents. The VT-1 has a very high
performance to cost ratio. Instillation of the V-1 on a high
pressure safety valve discharge will satisfy any concerns
regarding worker safety or OSHA noise compliance. |
Process vents, Safety & relief
valve discharge, compressor & gas transmission line blowdown
|
|
VT-2 |
For excellent silencing of high frequency noise
associated with steam or gas vents. |
|
VT-3 |
For the highest degree of silencing of high
frequency noise associated with steam or gas vents. The VT-3
provides the maximum noise reduction can be practically
obtained. |
|
Factors in Sizing |
Custom Design
Possibilities |
|
-
Main
-
Additional
-
Upstream Pressure
-
Specific Heat Ratio
-
Molecular Weight
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- Outlet Elbow
- Bird Screens
- Water Knockout System
- Custom Materials
- Inlet Diffusers
- Flanges
- Shell Plate
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Features |
Optional Accessories |
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- Advanced acoustical design
- All welded construction & long
service life
- Acoustical wool packing
- Prime coated exterior finish
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- Companion flanges
- Metallic wool packing
- Stub inlet & outlet connection
- Various support arrangements
- Special paints
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