RECD for DG setFor businesses operating diesel generators, choosing the right can be an important step toward managing particulate emissions from existing equipment. A retrofit emission-control device can be installed on a suitable in-use DG set, but the right solution depends on the engine, exhaust configuration, operating conditions, and applicable requirements.

This guide explains the key benefits, selection factors, installation considerations, and cost elements businesses should understand before investing in an RECD system.

What Makes RECD Relevant for Existing DG Sets?

Replacing an older generator is not always the only option when emission control needs to be considered. Retrofit technology is designed to work with an existing diesel generator, provided the equipment is technically compatible.

CPCB's published procedure specifically addresses type approval of Retrofit Emission Control Devices for in-use DG sets equipped with compression-ignition engines. The documentation includes technical information such as RECD type, manufacturer details, applicable engine families, and system specifications.

This makes technical matching an essential part of the purchasing process.

Key Benefits of Installing an RECD

1. Retrofit Approach

An RECD can provide an emission-control option for an existing generator without requiring immediate replacement of the complete DG set.

For facilities where the existing generator remains mechanically suitable, this can be worth evaluating as an alternative to purchasing a new generator.

2. Particulate Emission Control

RECD technology is particularly associated with controlling particulate matter from suitable in-use diesel generator engines.

However, performance should always be considered in relation to the specific RECD model, engine family, testing conditions, and applicable approval or certification documentation.

3. Continued Use of Suitable Existing Equipment

If an existing DG set is well maintained and technically suitable for retrofitment, an RECD may allow the business to continue using that equipment while addressing applicable emission-control requirements.

4. Application-Specific Solutions

RECD systems can be designed for different generator and engine applications. This means businesses can look for a system corresponding to their specific engine family and operating requirements rather than adopting a generic device.

What Determines RECD Cost?

There is no single standard price for every DG set.

The total cost can vary depending on several factors.

DG Set Capacity

Generator size influences the required RECD specification, exhaust arrangement, installation work, and associated components.

A smaller DG set and a larger industrial generator may require substantially different equipment and installation arrangements.

Engine Compatibility

The RECD needs to be suitable for the particular engine or engine family. This can influence product selection and documentation requirements.

Exhaust Modification

Installation may require changes to the existing exhaust arrangement, depending on the physical configuration of the generator room or outdoor installation.

Additional piping, supports, insulation, connectors, or other accessories may therefore affect the project cost.

Installation and Commissioning

The quotation should be evaluated as a complete solution rather than looking only at the equipment price.

Installation, testing, commissioning, documentation, and after-sales support can all form part of the overall project cost.

Maintenance Requirements

The long-term cost should also be considered. Depending on the technology, periodic inspection, cleaning, servicing, or replacement of components may be necessary.

A low initial quotation may not necessarily represent the lowest total cost over the operating life of the system.

What Should Be Checked Before Buying?

Before requesting quotations, collect the basic technical details of the DG set.

These can include:

DG set manufacturer
Engine manufacturer
Engine model
Rated kVA
Gross mechanical power, where applicable
Engine manufacturing year
Emission phase or relevant classification
Exhaust pipe dimensions
Operating hours
Typical generator load
Existing exhaust arrangement
Available installation space

Providing accurate information helps suppliers identify whether a particular RECD model is appropriate for the application.

Understanding RECD Certification and Documentation

Certification and technical documentation deserve particular attention when comparing products.

CPCB's RECD procedure includes a formal type-approval framework for applicable retrofit devices. Official material also describes technical information that may be required for RECD families and individual types.

For buyers, this means a supplier should be able to provide documentation relevant to the specific product being offered.

Rather than relying on a general statement such as "approved RECD," ask for the actual certificate or supporting documentation and check:

RECD manufacturer
Model or family designation
Applicable engine family
Rated power range
Type-approval or test information
Certificate date and validity information, where applicable
Any conditions or limitations
Conformity-of-production information, where relevant

The official documentation should be reviewed carefully because approval or suitability may apply only to particular engine families or operating conditions.

Installation Considerations

Correct installation is essential for both equipment performance and engine safety.

The RECD becomes part of the generator's exhaust arrangement, so the installation should account for exhaust temperature, pipe dimensions, mounting, accessibility, and back pressure.

CPCB's published material states that the DG set should be properly maintained before retrofitment and that defects that could prevent achievement of the applicable emission-reduction level should be addressed. It also emphasizes that installation should not impair the safety or operation of the DG set.

Check Back Pressure

One of the important engineering considerations is exhaust back pressure.

The complete exhaust system should remain within the limits specified by the engine manufacturer. A poorly designed modification can potentially affect engine performance.

Consider Operating Temperature

Some emission-control technologies depend on suitable exhaust conditions. The generator's actual load profile and operating temperature should therefore be evaluated during system selection.

Plan for Maintenance Access

The installation should allow technicians to inspect and service the equipment safely.

An RECD installed in a difficult-to-access location can make routine maintenance unnecessarily complicated.

Is RECD Required for Every DG Set?

Businesses should not assume that one rule applies identically to every DG set across India.

Requirements can depend on factors such as generator capacity, location, operating conditions, applicable environmental directions, and the specific regulatory framework in force.

For example, government and pollution-control-board documents have addressed RECD requirements for particular DG-set categories and geographic situations. The official material should therefore be checked for the location and application concerned.

This distinction is particularly important when preparing compliance documentation.

How to Choose an RECD Supplier

A supplier should be evaluated on technical capability, documentation, installation support, and service—not simply on the lowest quotation.

CPCB approved RECD manufacturersWhen comparing, verify the exact certification or type-approval documentation associated with the product being proposed.

Also consider whether the supplier can support:

DG set compatibility assessment
Site inspection
Product selection
Exhaust-system modification
Installation
Testing and commissioning
Preventive maintenance
Troubleshooting
Replacement parts
Documentation support

The Odisha State Pollution Control Board, for example, publishes information on generator-set guidelines and a list of manufacturers certified for RECD applications, illustrating why buyers should check current official information rather than relying only on supplier advertisements.

What About RECD Maintenance?

Installing the equipment is only the beginning.

Maintenance requirements depend on the particular technology and manufacturer's instructions. Regular inspections can help identify issues before they affect performance.

Businesses should maintain appropriate records of servicing and inspection and follow the recommended maintenance intervals.

The DG set should also continue to receive routine engine maintenance. Problems with combustion, air filtration, fuel systems, or other engine components can affect emissions and overall RECD performance.

How to Compare RECD Quotations

When comparing quotations, avoid comparing only the headline equipment price.

Instead, ask each supplier to clearly identify:

RECD model and specification
Applicable engine compatibility
Installation scope
Exhaust modification requirements
Testing and commissioning
Warranty
Maintenance requirements
Service support
Replacement components
Documentation supplied with the system

This approach provides a much clearer picture of the actual project cost.

Making the Right Purchase Decision

An RECD should be treated as an application-specific engineering product rather than a universal DG-set accessory.

Before purchasing, confirm the generator's technical details, establish the applicable regulatory requirements, compare technically suitable products, and verify the supporting documentation.

buy RECD for generator onlineFor businesses planning to , it is especially important not to finalize a product solely from an online catalogue or a generic kVA-based description. Confirm compatibility with the engine and obtain the necessary technical and certification documentation before placing the order.

Conclusion

RECD can be a practical retrofit emission-control option for suitable in-use diesel generator sets. Its benefits, cost, and installation requirements depend on the DG set, engine, exhaust arrangement, operating conditions, selected technology, and applicable requirements. The best purchasing decision begins with technical compatibility rather than price. Businesses should request detailed specifications, verify applicable certification or type-approval information, evaluate installation requirements, and understand ongoing maintenance needs. Most importantly, regulatory requirements should be verified against the latest official information applicable to the specific DG set and location. A technically suitable RECD and a regulatory compliance determination are not automatically the same thing. For businesses evaluating DG-set emission-control solutions, Aceget can help users understand available RECD options and the technical factors involved in selecting a suitable system.

RECD for DG Sets: Benefits, Requirements, Cost & Installation Guide

Explore RECD benefits, key requirements, installation considerations, cost factors, maintenance needs, and essential tips for choosing the right emission-contro