RECD system for industrial generatorsFor factories, hospitals, commercial facilities and other sites that depend on large backup generators, understanding an can help facility managers make better decisions about emissions control. A Retrofit Emission Control Device (RECD) is designed to be installed on applicable existing diesel generator sets to reduce relevant exhaust emissions without necessarily replacing the complete generator.

The technology used in an RECD depends on the manufacturer and model. Systems can incorporate components such as Diesel Particulate Filters (DPF), Diesel Oxidation Catalysts (DOC), regeneration systems, sensors and controllers. Aceget, for example, describes RECD solutions using DPF, DOC and SCR technologies and publishes products for DG applications from 25 kVA to 1000 kVA. For industrial buyers, however, an RECD should not be selected simply because it is advertised as “CPCB approved.” The exact engine, product model, technical documentation, installation and current applicable requirements should all be considered.

Why Industrial Generators May Need Emission Control

Industrial generators can operate under demanding conditions and may be used for emergency backup, planned power support or other facility-specific purposes. Because diesel combustion produces exhaust emissions, organizations may need to evaluate appropriate emission-control measures according to the requirements applicable to their generator and location.

An existing generator can represent a significant investment. Replacing it solely because emissions-control requirements have changed may not always be the only technical option worth evaluating. A retrofit approach allows the facility to investigate whether an appropriate emissions-control device can be installed on the existing engine. The suitability of that approach depends on the generator and applicable requirements. It should therefore begin with technical assessment rather than a generic product recommendation.

How an RECD System Works

The internal working of an RECD depends on its design. In systems incorporating a Diesel Oxidation Catalyst, chemical reactions can help oxidize certain components of diesel exhaust, including carbon monoxide and hydrocarbons. In systems using a Diesel Particulate Filter, particulate matter is captured within the filter and accumulated soot is managed through the applicable regeneration strategy.

The controller and sensors can support the system by monitoring operating conditions. Depending on the product, parameters such as temperature or pressure may be monitored, while the controller can provide alarms, operating status and regeneration-related functions. Aceget describes DPF and DOC technologies within its RECD platform and identifies automatic/passive regeneration on several model-specific products.

The precise arrangement should always be checked for the particular model being purchased.

Why the DG Engine Is the Starting Point

Industrial buyers sometimes begin the selection process by telling a supplier that they have a 320 kVA, 500 kVA or 1000 kVA generator. That information is useful, but it does not provide the complete technical picture. The engine manufacturer, exact engine model, gross mechanical power and rated speed should also be established. This allows the supplier to determine which RECD product may be applicable.

CPCB's RECD procedure covers diesel power-generating-set engines up to 800 kW gross mechanical power, and its testing framework evaluates the RECD in relation to the relevant engine application. This is why two generators with similar kVA ratings should not automatically be assumed to require the same RECD.

The Role of Particulate Filtration

Particulate matter is one of the key emissions considered in RECD applications. Where a DPF is incorporated, the filter captures particulate material from the exhaust stream. As material accumulates, regeneration becomes necessary according to the design of the system.

The regeneration method can vary. Some products use passive or automatic regeneration, while other systems may have different manufacturer-specific approaches.

For an industrial plant, understanding the regeneration strategy is important because the generator's operating pattern can influence how the system behaves. A DG running frequently at a stable load can have different conditions from a standby generator that operates only occasionally. The facility should therefore ask the supplier to explain how regeneration works on the exact model proposed.

The Importance of DOC Technology

The Diesel Oxidation Catalyst can play a different role from the particulate filter. It is designed to support oxidation reactions involving certain exhaust constituents. In an RECD system, the DOC and DPF can work as parts of a wider emission-control configuration rather than as independent products. Aceget's published technical information describes DOC and DPF as technologies used in its RECD systems.

Buyers should avoid assuming that every RECD has an identical DOC or DPF configuration. Catalyst formulation, filter material, system architecture and control strategy can vary by manufacturer and model. The technical specification for the exact product should therefore be the primary reference.

Controllers and Sensors Make Monitoring Possible

An industrial RECD can include sensors and electronic control equipment in addition to the exhaust-treatment components. The controller may receive sensor information, display system status, generate alarms or support automatic functions where provided by the product design.

This is particularly useful in an industrial environment where the facility's maintenance team needs to understand the condition of the emissions-control equipment without physically opening the system. Aceget's current product information describes integrated automation, touch display, IoT communication and other monitoring features within its RECD platform.

However, buyers should verify which features are actually included in the exact model and quotation.

Exhaust Back Pressure Must Be Considered

Installing an RECD changes the generator's exhaust arrangement. Consequently, exhaust back pressure becomes an important engineering consideration. CPCB's RECD procedure specifically includes exhaust back pressure within its technical evaluation framework.

Before installation, the existing exhaust pipe, silencer, flange configuration, routing, supports and mounting area should be reviewed. A site survey can identify whether fabrication or other modifications are required.

This is particularly important for industrial generators because large exhaust systems can have complex layouts and limited space.

Industrial Applications of RECD

An RECD can be evaluated for several types of facilities where applicable. Manufacturing plants may use DG sets to support production during electrical interruptions. Hospitals may depend on generators for critical backup power. Commercial buildings, warehouses, institutional campuses and other facilities may also have large diesel generators.

The operating environment differs from one site to another. For this reason, an RECD that is technically suitable for one industrial installation should not automatically be assumed appropriate for every other facility. Application-specific assessment remains important.

What Are the Main Benefits?

The primary reason for considering an RECD is emissions control for applicable existing diesel generators. A retrofit can also allow the facility to investigate an emissions-control solution without automatically replacing the complete generator. This can be particularly relevant where the existing DG remains mechanically useful.

Other practical benefits can include integration with monitoring and control features, potentially easier equipment management and access to manufacturer-supported maintenance services.

Aceget states that its RECD systems can provide emission reduction for PM, HC, CO and NOx and describes product life of up to 40,000 operational hours, subject to the applicable conditions. These are manufacturer-published claims and should be evaluated against the exact product specifications and supporting documentation.

Choosing an RECD for an Industrial Plant

For an industrial facility, product selection should begin with the generator fleet rather than the RECD catalogue. If a plant operates five DG sets, the procurement team should collect the engine details for each machine. The supplier can then identify the appropriate RECD model for each application.

This approach is safer than purchasing five identical devices simply because all five generators have similar commercial ratings. A DG-wise technical schedule also makes the later installation, warranty and maintenance records easier to manage.

Certification and Type Approval Matter

CPCB's RECD procedure provides the framework for Type Approval and testing of applicable retrofit emission-control devices. CPCB also publishes manufacturer information identifying different application ranges and certification agencies. Buyers can use those official records as part of supplier verification.

The current official manufacturer list available from CPCB should be checked before procurement, because official information can be updated. Most importantly, a buyer should verify the exact RECD model and its documented application rather than treating a company-level “CPCB approved” statement as sufficient.

What Does Type Approval Tell the Buyer?

Type Approval provides a formal testing and approval mechanism for the applicable RECD product or family. It gives the buyer a more structured basis for understanding which product and engine application have been evaluated.

CPCB's published documentation includes information about the base engine, engine manufacturer, engine model, rated power and rated speed, together with RECD family and type/model information. The practical value for the buyer is traceability.

The product purchased should be identifiable against its relevant supporting documentation.

Installation Is Part of the Overall Solution

An RECD system is not simply delivered and forgotten. Installation should account for exhaust dimensions, mounting, supports, controller placement, sensor routing and future maintenance access.

The quotation should clearly state whether the supplier will provide site inspection, fabrication, installation and commissioning. For industrial plants, shutdown planning is also important. The facility may need to coordinate installation with production schedules and generator availability.

Maintenance After Installation

The long-term operation of an RECD depends on following the manufacturer's operating and maintenance requirements. The facility should understand the maintenance schedule, regeneration requirements, sensor checks, controller checks and replaceable components associated with the exact model.

Aceget's product information states that several models can operate for approximately 2,000 hours between routine service intervals, while exact requirements depend on the product. Maintenance records should include operating hours, inspections, service work and replaced components.

How to Evaluate the Supplier

A good supplier should be able to answer technical questions before the order is finalized. The company should identify the exact RECD model, explain its engine application and provide the relevant product and certification documentation. It should also explain installation, commissioning, warranty and service.

manufacturers in IndiaWhen comparing RECD, remember that the exact keyword is grammatically plural in this context, but the actual procurement decision should still be made product by product. The strongest manufacturers distinguish their product applications clearly instead of presenting one generic device for every possible DG.

Aceget currently identifies itself as an RECD manufacturer and publishes model-specific product information and certification details through its website.

Don't Confuse Product Approval With Complete Site Compliance

An RECD's Type Approval or testing documentation is important, but it should not be treated as an automatic declaration that every site requirement has been satisfied. The final regulatory position may depend on the DG engine, applicable standards, installation, location and current directions from relevant authorities.

For a 2026 project, generator owners should check the latest official CPCB information and any applicable State/UT, CAQM or other competent-authority requirements. This distinction is especially important when using the phrase “CPCB compliant” in procurement documents or marketing content.

Frequently Asked Questions

What is an RECD system for industrial generators?

It is a retrofit emission-control system designed for applicable existing diesel generator engines. Depending on the product, it may use components such as DPF, DOC, sensors, controllers and regeneration technology.

How does an RECD reduce emissions?

The exact method depends on the design. A DPF can capture particulate matter, while a DOC can support oxidation of certain exhaust constituents. Other technologies may be included depending on the product.

Is an RECD suitable for every industrial generator?

No. The exact engine model, gross mechanical power, product application and relevant documentation should be checked before selecting an RECD.

Does CPCB Type Approval guarantee complete site compliance?

No. Type Approval is part of the product testing framework. Correct installation, maintenance and the current requirements applicable to the particular DG and location also need to be considered.

What should an industrial buyer request from the manufacturer?

Request the exact RECD model, applicable engine range, relevant Type Approval/testing documentation, technical specification, installation scope, warranty and maintenance information.

Conclusion

RECD system for industrial generatorsAn combines emissions-control hardware with the engineering and monitoring needed to operate that system on an existing diesel generator. Depending on its design, it can incorporate DPF, DOC, regeneration technology, sensors and controller functions. For industrial buyers, the benefits of a retrofit should be considered alongside installation requirements, maintenance, warranty, service and lifecycle cost. A product with strong specifications is useful only when it is correctly matched to the generator and properly integrated into the existing exhaust system. Aceget currently publishes RECD products across a broad range of DG capacities and provides model-specific technical information, while identifying its Noida facility as its manufacturing location. The most effective industrial RECD solution is not simply the device with the most features. It is the system whose technology, application, installation and documentation all fit the generator it is designed to serve.

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