NSV

BUSINESS

Plant

Plant

NSV precisely analyzes various types of noise generated at plant sites and provides optimized noise-reduction solutions tailored to equipment characteristics and site conditions.

Noise Control
Workflow

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STEP 01
Site Review

We review the site before and after construction to check noise criteria and background noise levels.

  • Current Condition Review: Pre- and post-construction assessment, background noise measurement, review of surrounding environmental impact
  • Standards Review: On-site noise management criteria and legal regulatory standards
STEP 02
Noise Source Review

We review equipment specifications and drawings to identify the primary noise sources.

  • Noise Transmission Path Review: Review of indoor workplace noise and outdoor workplace noise
  • Noise Source Identification: Identifying noise sources through on-site investigation and reviewing design drawings
  • Equipment Noise Level Estimation: Measuring noise levels from operating equipment, collecting vendor data before operation, and estimating noise levels based on equipment specifications
Incorporation of Major Equipment
Incorporation of Topographic Data
STEP 03
Analysis Modeling (3D)

We perform 3D modeling by incorporating architectural drawings and topographic data.

  • Current Condition Review: Referencing full plant drawings and reflecting surrounding site conditions
  • Architectural Drawings Integration: Modeling on-site buildings and external radiation (noise emission) locations
  • Equipment Layout: Incorporating actual equipment layout conditions
  • Topographic Data Integration: Reflecting plant terrain conditions
Noise Impact Assessment Software: SOUNDPLAN v8.1
Noise Impact Assessment Software: Virtual.Lab v13.9
STEP 04
Noise Analysis

We analyze noise impact using dedicated simulation tools and evaluate whether the results meet the required standards.

  • Noise Source Power Level Estimation: Quantifying the characteristics of each noise source
  • Current Condition Review: Reviewing noise impact for both the design plan and current conditions, checking compliance with target criteria, and estimating required noise reduction if standards are exceeded
  • Major Noise Source Analysis: Identifying key noise sources through impact assessment and calculating target reduction levels
Estimation and Prediction of Target Noise Reduction After Evaluation
Assessment Based on Current Condition Review
STEP 05
Evaluation

We evaluate whether the target criteria are met and calculate the required reduction amount when necessary.

  • Target Criteria Evaluation: Checking whether the criteria are satisfied
  • Target Reduction Calculation: Determining the required reduction amount when standards are exceeded
Detailed Drawing of HVAC Silencer
Detailed Drawing of HVAC Silencer
Enclosure Detailed Drawing
Detailed Drawing and Cross-Section of Noise Chamber
Detailed Drawing and Cross-Section of Noise Chamber
Cooling Tower Noise Reduction Details
STEP 06
Mitigation Measures

We propose noise control measures tailored to the noise source, transmission path, and receiver point.

  • Noise Control Proposals: Measures to achieve the target reduction level for each piece of equipment
  • Types of Noise Control Measures: Source control, path control, and receiver-point control
STEP 07
Verification

After the noise control construction is completed, we measure the noise levels and verify them by comparing with the analysis results.

  • Post-Construction Noise Measurement: Obtaining actual measured values
  • Analysis Verification: Comparing simulation results with on-site measurements

Applications

S Electronics Semiconductor Plant

G Construction Company – Plant Construction

H Construction Company – Plant Construction (1)

H Construction Company – Plant Construction (2)

Major Noise Sources
and Control Measures

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Noise Source Recommended Controls
Fans / Blowers
  • Airborne noise at intake and discharge
  • Structure-borne noise from the casing
  • Structure-borne noise transmitted through the floor
  • Install silencers at intake and discharge
  • Apply acoustic lagging
  • Apply vibration isolation structures
Forced Draft Fan / Induced Draft Fan
  • Airborne noise at fan inlet
  • Airborne noise from exhaust stack
  • Structure-borne noise from fan casing and duct
  • Inlet silencer for fan
  • Stack silencer (outlet section, intermediate section)
  • Acoustic lagging
Air Compressors
  • Airborne noise at inlet and discharge
  • Structure-borne noise from casing
  • Structure-borne noise from piping
  • Inlet silencer
  • Discharge silencer
  • Blow-off silencer
  • Enclosure
  • Acoustic lagging for piping
Cooling Towers
  • Fan rotational noise and noise from water impacting the fill material radiate through openings
  • Radiated noise from cooling tower walls
  • Soundproof barriers around the cooling tower
  • Enclosure
  • Inlet and discharge silencers for fan
  • Cooling tower casing lagging
Gas Vents / Steam Vents
  • Noise generated when fluids are released into the atmosphere through safety valves or control valves of high-pressure pipes and tanks
  • Noise emitted to the atmosphere during valve operation
  • Silencer installed at pipe discharge
  • Acoustic lagging
Control Valves – Gases/Steam
  • Noise generated from the valve and radiated through the valve surface or downstream piping surfaces
  • Acoustic lagging on valve and piping surfaces
  • Silencer
Pumps
  • Noise radiated from the pump surface
  • Enclosure (w/ Silencer)
Steam, Gas Turbines
  • Noise radiated from turbine surfaces
  • Enclosure (w/ Silencer)
Pipe Flow Noise
  • Vortex-induced noise generated by pipe geometry, radiated through pipe walls or emitted through openings
  • Silencer at pipe discharge
  • Acoustic lagging
Boiler / Furnace
  • Combustion noise emitted through air inlets and other openings
  • Soundproof / sound-absorbing ducts
Reciprocating Diesel Engines and Gas Engines
  • Exhaust noise from engine combustion gases
  • Radiated noise from engine surfaces
  • Intake noise for combustion air
  • Cooling system noise (air-cooled)
  • Enclosure (w/ Silencer)
  • Intake and exhaust silencers
Compressor for Refrigeration
  • Noise radiated from compressor surfaces
  • Enclosure (w/ Silencer)
Electric Motors
  • Noise radiated from motor surfaces
  • Cooling fan noise from the motor
  • Enclosure (w/ Silencer)
Generator
  • Noise radiated from generator surfaces
  • Enclosure (w/ Silencer)
Transformer
  • Noise radiated from transformer surfaces
  • Enclosure (w/ Silencer)
  • Soundproof wall
Gears
  • Noise radiated from gearbox surfaces
  • Enclosure (w/ Silencer)

Other Noise Reduction Devices

Rectangular Silencer

Soundproof Louver

Absorptive Sound Barrier

Top-Mounted Noise Reduction Device for Sound Barriers