Question 1

What is industrial noise control, and why is it important?

Accepted Answer

Industrial noise control involves the application of engineering solutions to reduce noise levels generated by industrial equipment, processes, and facilities. It is important for three primary reasons: protecting worker health and hearing (prolonged exposure to noise above 85 dB(A) causes permanent hearing loss), ensuring regulatory compliance with OSHA occupational noise limits and CPCB environmental noise standards, and improving productivity and communication in the workplace. Effective noise control also reduces community noise impact, helping companies maintain their social license to operate.

Question 2

How does ARK Noise Control approach a new noise control project?

Accepted Answer

Every project begins with a thorough understanding of the noise problem. Upon receipt of any new inquiry, our sales team send an inquiry form requesting the required technical inputs along with photographs, GA drawings, and other relevant details (if available). Based on these inputs, our acoustic engineers analyse the problem and propose the right solution — which may involve acoustic enclosures, silencers, NoiseLAG / HeatLAG jackets, barriers, or other treatments — and send a detailed techno-commercial offer. Upon order confirmation, we proceed with detailed engineering design, in-house manufacturing, and site installation. After installation, we conduct verification measurements to confirm that the target noise levels have been achieved.

Question 3

What noise reduction can I expect from an acoustic enclosure?

Accepted Answer

The noise reduction achieved by an acoustic enclosure depends on the enclosure design, construction quality, and the frequency characteristics of the noise source. Our standard enclosures provide 10 to 40+ dB(A) of noise attenuation. A 10-15 dB(A) enclosure is suitable for moderate noise reduction needs, while a 40+ dB(A) enclosure is used for high-noise equipment like gas turbines and large compressors. The actual attenuation is determined during the design phase based on the target noise level at the receiver location and the noise spectrum of the equipment.

Question 4

What are NoiseLAG / HeatLAG jackets, and how do they differ from traditional pipe lagging?

Accepted Answer

NoiseLAG / HeatLAG jackets are ARK's proprietary removable acoustic + thermal insulation jackets designed to reduce noise and heat loss from pipes, valves, and equipment. Unlike traditional permanent lagging (which is permanently fixed and must be destroyed for maintenance access), NoiseLAG / HeatLAG jackets are fully removable and reusable. They can be taken off in minutes for equipment maintenance and reinstalled afterward without any degradation in acoustic performance. Each jacket is custom-fitted to the exact geometry of the equipment and delivers up to 10 dB(A) noise reduction. With over 1500 units installed worldwide, they are a proven, cost-effective solution for situations where regular maintenance access is required.

Question 5

What types of industrial silencers does ARK manufacture?

Accepted Answer

ARK manufactures nine types of industrial silencers, each optimized for its specific application: Steam Vent Silencers, Blow Down Silencers, Safety Valve Silencers, Air Intake Silencers, Air Discharge Silencers, Gas Vent Silencers, Diffuser Silencers, HVAC Duct Silencers, and Diesel Engine Exhaust Silencers. Each silencer is custom-designed based on the client's operating conditions including flow rate, pressure, temperature, and medium composition. Our silencers deliver up to 40+ dB(A) noise reduction while maintaining low backpressure to minimize impact on system performance.

Question 6

What industries does ARK Noise Control serve?

Accepted Answer

ARK Noise Control serves a broad range of industries including Oil & Gas, Power Generation, Petrochemicals, Pharmaceuticals, Automotive, Cement, Steel, Mining, Food Processing, HVAC, Marine, and Defense. With over 40+ years of experience, we have executed noise control projects for leading companies across these sectors. Our solutions are tailored to the specific noise challenges, operating conditions, and regulatory requirements of each industry.

Question 7

What is a noise mapping study, and when do I need one?

Accepted Answer

A noise mapping study is a comprehensive assessment that creates a spatial representation of noise levels across your facility using calibrated measurements and computational modeling. You need a noise mapping study when: you want to identify which equipment is the dominant noise contributor, you need to demonstrate regulatory compliance at your plant boundary, you are planning noise control investments and want to prioritize based on data, or you are designing a new facility and need to predict noise impact. Our noise maps help plant engineers make informed decisions about where and how to invest in noise control for maximum benefit.

Question 8

What are the Indian regulatory standards for industrial noise?

Accepted Answer

In India, industrial noise is regulated under two frameworks. For occupational noise (worker exposure), the Factories Act 1948 and associated rules specify a permissible exposure limit of 90 dB(A) for 8 hours, consistent with OSHA standards. For environmental noise (plant boundary and community impact), the Central Pollution Control Board (CPCB) has established ambient noise standards under the Environment Protection Act 1986: industrial areas have a limit of 75 dB(A) during the day and 70 dB(A) at night, while residential areas have limits of 55 dB(A) day and 45 dB(A) night. State pollution control boards may impose additional or stricter requirements.

Question 9

How long does a typical noise control project take from inquiry to completion?

Accepted Answer

Project timelines vary based on complexity and scope. A simple noise survey and report takes 1-2 weeks. NoiseLAG / HeatLAG jackets for a defined scope can be designed, manufactured, and installed in 4-6 weeks. Standard acoustic enclosures typically take 8-12 weeks from order to installation. Large-scale projects involving multiple enclosures, silencers, and barriers for an entire facility may take 4-6 months. Custom-engineered solutions like acoustic test cells can take 3-6 months depending on size and complexity. We provide detailed project schedules at the proposal stage and work closely with clients to meet their timeline requirements.

Question 10

Does ARK Noise Control provide after-sales support and maintenance services?

Accepted Answer

Yes, ARK provides comprehensive after-sales support for all our products and installations. This includes periodic inspection and maintenance of acoustic enclosures, replacement of acoustic seals and infill materials, performance verification measurements to ensure continued acoustic effectiveness, and technical support for any operational issues. We also offer annual maintenance contracts (AMCs) that include scheduled inspections and priority response for any service needs. Our goal is to ensure that our noise control solutions continue to perform at their designed levels throughout their service life.

Question 11

What is the best noise control solution for an industrial compressor?

Accepted Answer

The best noise control solution for an industrial compressor depends on the noise level, compressor type, and site constraints. For high-noise compressors (95-110+ dB(A)), a custom-engineered acoustic enclosure is the most effective solution, providing 10-40+ dB(A) reduction with silenced ventilation for cooling. For moderate noise issues or where a full enclosure is impractical, NoiseLAG removable acoustic jackets can reduce casing-radiated noise by up to 10 dB(A). In some cases, a combination of an enclosure with intake/discharge silencers provides the best overall noise reduction. ARK Noise Control can assess your specific compressor installation and recommend the optimal, cost-effective solution.

Question 12

What is the difference between an acoustic enclosure and a noise hood?

Accepted Answer

An acoustic enclosure is a fully enclosed structure that surrounds equipment on all sides (including roof), providing noise attenuation of 10-40+ dB(A). A noise hood is a partial enclosure — typically a removable cover that fits over the top and sides of equipment while leaving the base open for piping and cable connections. Noise hoods provide moderate noise reduction of 10-25 dB(A) and are commonly used where full enclosure is impractical due to extensive piping or where the equipment requires frequent top-access maintenance. Both solutions use multi-layer acoustic panels with absorptive and barrier materials. ARK manufactures both acoustic enclosures and noise hoods, and our engineers can recommend which approach is best suited for your equipment and target noise level.

Question 13

Can noise control solutions be installed without plant shutdown?

Accepted Answer

Yes, many noise control solutions can be installed during normal plant operation without requiring a shutdown. Modular acoustic enclosures are assembled panel-by-panel around operating equipment. NoiseLAG / HeatLAG removable insulation jackets can be fitted on hot, operating equipment using heat-resistant gloves. Acoustic barriers and noise screens are erected around noisy areas without affecting equipment operation. Silencer installations on vents and exhausts may require a brief isolation of the specific line but do not require a full plant shutdown. ARK Noise Control has extensive experience in live-plant installations across refineries, power plants, and chemical facilities, and we plan our installation sequences to minimize operational disruption.

Question 14

What noise control products are available for steam turbines?

Accepted Answer

Steam turbines require a multi-faceted noise control approach due to multiple noise sources. ARK offers: acoustic enclosures to address casing-radiated noise (10-40+ dB(A) reduction), steam vent silencers for turbine bypass and start-up venting, safety valve silencers to reduce high-pressure steam discharge noise, NoiseLAG / HeatLAG removable insulation jackets for the turbine casing, valve bodies, and connected piping (providing up to 10 dB(A) noise reduction plus thermal insulation), and exhaust silencers for extraction and condensing systems. An integrated approach combining multiple products is typically the most effective and cost-efficient strategy for comprehensive steam turbine noise control.

Question 15

Does ARK Noise Control export outside India?

Accepted Answer

Yes, ARK Noise Control exports to over 60 countries across six continents. We have completed projects in the Middle East (UAE, Saudi Arabia, Qatar, Kuwait, Oman, Bahrain), Europe (UK, Germany, Netherlands, Belgium), Asia-Pacific (Singapore, Malaysia, Thailand, Indonesia, Australia, New Zealand), Africa (Nigeria, South Africa, Egypt, Kenya), and the Americas (USA, Canada, Brazil, Mexico). Our products are designed to meet international standards including OSHA, EU Machinery Directive, ATEX, and IEC requirements. We provide complete export packaging, documentation, and can coordinate with local installation teams at the project site.

Question 16

How do removable insulation jackets compare to permanent lagging?

Accepted Answer

Removable insulation jackets (such as ARK NoiseLAG / HeatLAG) offer several advantages over traditional permanent lagging. Permanent lagging is typically fiberglass or mineral wool wrapped with metal cladding and permanently fixed — it must be cut open and destroyed for maintenance, generating waste, and then re-fabricated and re-installed at significant cost and downtime. Removable jackets are custom-fitted reusable covers with fasteners (Velcro, buckles, or lacing) that can be removed in minutes and reinstalled after maintenance with no degradation in performance. Over a 10-year lifecycle with periodic maintenance, removable jackets are 30-50% more cost-effective than permanent lagging due to elimination of repeated re-lagging costs. They also provide consistent acoustic and thermal performance across multiple removal-installation cycles.

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