Silencer design is constrained by the flow conditions and the overall performance required. Ventx design each silencer to reduce the noise level to the required sound pressure level specified by the customer. First we need to predict the venting valve noise, which is determined by the process conditions.
Ventx Industrial Silencers have a basic design principle that enables us to supply the best solution for the customer.
When venting high pressure steam the Ventx inlet diffuser design can help reduce valve size selection. As the inlet is design to a pressure code you can be sure the unit is up to the job. The same applies for air or any other gas. Ventx will help with a positive solution, robust Industrial Silencers that are guaranteed to do the job.
Atmospheric Vent Discharge Industrial Silencer. This uses a combination of diffuser design and an absorptive core section. The gas or steam enters the silencer through a multi-hole diffuser where it is permitted to expand through many holes into the expansion chamber. These units can be designed to be mounted Vertically or Horizontally, available with optional Bird Screens and Weather-Hoods.
Control Valve Silencer. This design of silencer employs the same principle of acoustic design as a vent silencer. This type of silencer is usually designed to a pressure code, and are used extensively in natural gas and hydrocarbon lines. Ventx offer to design to ASME B31.3, ASME VIII or PD5500 pressure codes.
Direct In-Line Silencer. These are designed to produce as little pressure loss as possible, but achieve the required attenuation using only an absorptive section. Ventx design this type of silencer to ensure a low pressure loss. Often found on Compressor Inlet and Outlets and can be designed to a suitable Pressure Code.
Direct In-Line Silencers can be supplied as a simple acoustic core for inserting into the customers pipe work or as a complete vessel.
Steam or Gas Ejector Silencer. This type of silencer is specifically designed for use with Steam or Hydrocarbon Gas Ejectors. Ventx calculate the ejector noise and flow mixture, then design a suitable unit for either venting to atmosphere or reducing the noise along the pipe wall.
These units are often designed and manufactured to a design code, but can also be manufactured as a cartridge for the customer to insert into their own pipe work.
The Flow Rate of the gas determines the diameter of the silencer so that the gas can safely pass through without eroding the acoustical packing or regenerating noise. The silencer length is governed by the degree of noise reduction to be achieved. A Ventx Silencers uses a combination of diffuser design and an absorptive core section. The gas and noise enters the silencer through a multi-hole diffuser where it is permitted to expand through many holes into the expansion chamber. The diffuser also provides a frequency shift to higher frequencies, which are best attenuated by the absorptive section. The gas then passes through this absorptive section, which consists of perforated flow passages surrounded by dense long strand fiberglass acoustical packing providing a broad range of attenuation in the mid to high frequency ranges.
A vent silencer is a device used to reduce unwanted noise created by gas or steam flow in a pipeline discharging directly into the atmosphere. This noise can be generated due to the high velocity flow through the valve and turbulence created around any obstacle in the line that suddenly restricts or changes the direction of flow such as valve or an orifice device.
Vent silencers find wide applications in high pressure vents, steam vents, safety relief valve outlets, system blow downs, purge and flare outlets. The generated noise is a function of upstream pressure and temperature, type of gas, the valve size and type, plus the effect of down stream piping.
Ventx design each silencer to attenuate the noise level to the required sound pressure level specified by the customer.
An in-line silencer employs the same principle of acoustic design as a vent silencer. A main consideration with in-line noise is to reduce the vibration caused by the valve noise, as noise is basically air born vibration.
There are two types of silencer for in-line applications;
Ventx can manufacture both types of In-Line silencer for use in pressurized systems and to a suitable pressure design code. There are a number of variations with In-Line silencers, and we can design and supply just Diffuser Silencers or Insert Silencers to suit your application.
Ventx silencers are also designed to provide a required back pressure, which can help when selecting a valve and this is why our silencer inlets are always designed and manufactured with reference to a design code.