Advantage

INERCO
Acoustic Technology
Silencers for valves
Vent & Blowdown Silencers

www.klingeradvantage.com
INERCO Acoustic Technology designs and manufactures » Valve outlet area: High fluid velocity at Mach numbers at or
silencers to reduce noise generated during atmospheric above 0.3 through the control valve outlet or pipe can result
expansion of gases during valve discharges, blowdowns and in increased turbulence and noise;
ejections.
» Flow rate: High flow rates have a potential to increase
Noises generated in some safety and control valves may be turbulence and noise;
higher than 150 dB(A), which can result in important issues for
plant operations and maintenance. Noise exposure decreases » Noise calculation: There are several methods to estimate
and limits system performance and productivity. noise produced by discharge valves (API 521, VDI 2713, ISO
4126).
Silencers are used to reduce noise produced in safety valves
(PSV), relief valves, starter valves, blowdowns, ejectors, boilers,
and tank discharges.

VENT SILENCER TECHNOLOGY

NOISE
INERCO Acoustic Technology vent silencers have three main ABSORBER
components:
SUPPORTS
» Inlet diffuser reduces the noise generated and modifies the
sound spectrum so it can be better controlled in the absorptive
PERFORATED
stages of the silencer. This is obtained by dividing the flow into
NOISE ABSORBER
hundred of small jets; SHEET
» Absorbent plenum is an expansion chamber designed to
homogenize the gas flow before the reduction of acoustic DIFFUSER
energy that is obtained in the dissipative stage; SILENCER
CASE
» Dissipative stage makes the fluid going through a system of
crowns (cylindrical design), or absorbent baffles (prismatic
design). Significant noise reductions are achieved by viscuous
friction depending on the design of the silencer as well as the INLET DRAINAGE
properties of the fluid; PIPE

Designing a vent silencer requires the following

Valve noise effects information:
and factors » Noise limits and sound pressure levels: location and
duration of the discharges are considered;
There are several factors that may affect noise generation:
» Flow conditions: fluid, density, mass flow, temperature,
» Pressure drop and pressure drop ratio: Drops in pressure pressure drop available;
and high pressure drop ratios increase the potential for noise.
The pressure drop ratio, the change in pressure divided by the » Pressure conditions: choice of materials, material
inlet pressure, is an indicator used to determine the thicknesses, types of flanges, types of welds;
performance level required to the control valve trim; » Sizing: physical space and weight available, description
» Valve/trim geometry: Tortuous flow paths can increase of support structures;
turbulence and noise, which can cause damage to the control » Silencer Connection: welded or flanged.
valve trim, body, and pipeline. Other factors affecting noise Expansion joints to allow movements produced by
include flow path size, shape, and location. expansion.
Standard design and main
features
» Quality and value: manufacturing according to ISO
9001:2008;
Designed according to the ASME Boiler and Pressure
vessel code;
» Welder performance qualifications, and welding
procedure specifications according to ASME Section IX;
» End connection flanges compliant with ASME B 16.5
and butt-welded end with ASME B 16.25;
» Customized design:

- Noise control range: from 15 dBA to up 60 dBA of

noise attenuation;
- Vent silencers are available in different materials:
carbon steel, stainless steel, alloyed steel;
- Protective coating and surface treatment;
- Temperature limits up to 650 ºC;
- ASME Class 150 – 2500;
- Inlet size NPS 2 – 40;
- Multiple inlets available;
- Effective operating time of 10,000 hrs;
- Drainage;
- Lower life – cycle cost: no maintenance
requirements;
- Non-destructive test (dye penetrant inspection,
X-ray...);
- Engineering: mechanical calculation and fluid
dinamic piping design;
- Pressurizing discs up to 20 bar back pressure;

- International shipping;
- Accesories: Expansion joints, brackets, stands,
goose necks, weather hoods, bird screens,
insulation clips.
Accurate noise prediction
INERCO Acoustic Technology has over 30 years of experience in the research,
development and innovation of noise reduction technologies. In order to predict the
acoustic behavior of our equipment (sound attenuation) we have developed acoustic
models to study all the parameters involved in the design of vent silencers, such us
mechanical and structural design and fluid dynamic parameters (temperature,
pressure, fluid velocity).

INERCO Acoustic Technology has an acoustic laboratory and acoustic test

chambers in Seville (SPAIN), where client prototypes are tested

SINV acoustic attenuation spectra in dB

APPLICATIONS
» POWER INDUSTRY: Coal and combined cycle power
Expected noise levels after placing the silencer (dBA) plants, co–generation and renewable energy plants (solar
thermal, geothermal, bio–mass), in the main steam,
auxiliary steam, turbine by–pass, and sky vent;

» HYDROCARBON INDUSTRIES: steam, flare gas,

natural gas, hydrogen, light hydrocarbons, stripper gas.
PROCESS INDUSTRIES: chemical, metals and mining,
pulp and paper, and food and beverage;

» PROCESS INDUSTRIES: chemical, metals and mining,

pulp and paper, and food and beverage.

KLINGER Advantage - About us

KLINGER Advantage provides fluid control equipment and services to operators in the chemical and petro-chemical
sectors in the Gulf Coast area as well as the rest of the U.S. market. Product Lines Include: Ball, Butterfly, Plug and Piston
Valves, plus Accessories Valve Repair Services, Valve Control Solutions and Devices Actuators, Solenoids, Limit Switches,
Positioners, and more.
The company was founded as Advantage Technical Services in 2002 as a specialty valve distribution company in Baton
Rouge, LA. In 2013 KLINGER International GmbH acquired the company and KLINGER Advantage was created.
KLINGER was founded in 1886 by Austrian engineer Richard Klinger.
The company employs over 2,000 people in 60+ locations around the world. KLINGER remains family owned and is
headquartered near Vienna, Austria.