RECD manufacturer in IndiaChoosing an is becoming an important consideration for owners of diesel generator sets evaluating retrofit emission-control requirements. However, the statement that every diesel generator automatically “needs” an RECD should be understood carefully: applicability depends on the engine, its emission category, the current regulatory requirements and the specific installation.

For generator owners, the important issue is therefore not simply whether an RECD is available, but whether a particular retrofit device is applicable to the specific DG set and helps address the current requirements governing that installation.

Why RECD Has Become Important for DG Owners

Diesel generators remain important backup-power assets for factories, hospitals, commercial buildings, offices, institutions, data centres and other facilities. Replacing an existing DG set can be a major capital expense, particularly when the generator is otherwise mechanically suitable for continued operation. A retrofit emission-control device provides a way to consider emissions control on an existing diesel generator. The technology and configuration vary by manufacturer, but the objective is to control relevant exhaust emissions through a retrofit system that has been evaluated under the applicable testing framework.

CPCB's published RECD procedure covers diesel generating-set engines up to 800 kW gross mechanical power and describes testing requirements for the RECD-plus-engine combination. That distinction matters because the RECD is not assessed independently of the generator application.

The Engine Comes Before the RECD

A common procurement mistake is to begin with the generator's kVA rating.

For example, a buyer might approach a supplier saying, “We have a 500 kVA DG and need an RECD.” That is useful commercial information, but it is not enough for technical selection. CPCB's published manufacturer information specifically notes that during Type Approval testing, the RECD and engine combination is tested for mechanical gross power in kW and that the corresponding kVA rating should be checked against the data plates on the in-use engine and DG set.

For this reason, the buyer should establish the engine manufacturer, engine model, gross mechanical power, rated speed and other relevant technical details before selecting the retrofit device.

Understanding Phase I and Phase II Applications

The CPCB RECD framework distinguishes between Phase I and Phase II engine applications. The published manufacturer list describes Phase I as genset engines complying with the emission norms specified in GSR 371(E), dated May 17, 2002. Phase II is described in relation to GSR 771(E), dated December 11, 2013, as amended.

This is one reason an owner should not assume that a single RECD model is suitable for every diesel generator in a facility. A plant may have several DG sets installed at different times, with different engine models and emission categories. Each installation should therefore be evaluated on its own technical details.

What CPCB Type Approval Means

Type Approval is an important part of evaluating an RECD.

CPCB's published procedure states that manufacturers, importers and retrofitters supplying RECDs for applicable genset applications are required to obtain Type Approval and comply with Conformity of Production requirements.

The procedure identifies approved testing agencies including the Automotive Research Association of India (ARAI), the International Centre for Automotive Technology (ICAT), the Indian Institute of Petroleum (IIP) and the Vehicle Research Development Establishment (VRDE), along with provisions for appropriately accredited NABL laboratories that meet the stated requirements.

This gives buyers a practical verification path. Instead of relying on a sales statement such as “CPCB-approved RECD,” ask for the exact product documentation and identify the relevant testing/certification agency.

Performance Should Be Viewed in Context

CPCB's testing framework evaluates the RECD and engine as a combination. The published procedure includes technical testing related to particulate matter and gaseous emissions, as well as smoke, specific fuel consumption, regeneration characteristics and exhaust back pressure.

This is important when reviewing manufacturer brochures.

A supplier may advertise a particular percentage of emission reduction. The buyer should ask which RECD model was tested, which engine was used, what test conditions applied and whether the result is relevant to the proposed installation. A result from one engine configuration should not automatically be presented as a guaranteed real-world result for every DG set.

Installation Is Part of the Compliance Picture

Purchasing a suitable RECD is only one stage of the project. The device must also be installed correctly. The existing exhaust system can differ significantly between generators. Pipe diameter, flange arrangement, silencer location, routing, supports and available mounting space all need to be considered.

CPCB's procedure specifically includes exhaust back pressure within its technical framework. Therefore, a site survey can be an important part of a serious retrofit project. A manufacturer or installer should understand the existing DG installation before finalizing fabrication and connection requirements.

Why Maintenance Cannot Be Ignored

An RECD should not be treated as a fit-and-forget device.

The exact maintenance requirements depend on the selected technology and model, but the facility may need to manage inspections, sensors, controllers, regeneration-related functions, cleaning and replacement of specified components. CPCB's procedure states that an RECD system is intended to comply with the applicable provisions during normal operating conditions when used and maintained according to the manufacturer's instructions. This makes maintenance an important part of the long-term performance strategy.

Choosing the Right RECD Supplier

RECD supplier for DG setsFor a business comparing an , the decision should extend beyond the initial quotation. The supplier should be able to identify the exact RECD model, explain its applicable engine range, provide relevant technical and Type Approval documentation, discuss installation requirements and offer a clear warranty and service arrangement.

CPCB's published manufacturer list provides a useful starting point because it identifies RECD manufacturers, documented engine-power ranges, Phase applicability and certification agencies. However, the list should not be interpreted as a ranking of manufacturers or as proof that every product from a listed company is suitable for every generator. The final selection should be based on the particular DG engine and the product documentation supporting that application.

Is an RECD Required for Every Diesel Generator?

This is where the article title needs an important qualification. Not every diesel generator should automatically be described as legally required to install an RECD without checking the applicable current requirements.

The need for a retrofit may depend on the engine's characteristics, applicable emission category, regulatory provisions, location and directions from competent authorities. Therefore, generator owners should avoid making a blanket assumption that every DG set has the same obligation. The correct approach is to identify the generator, establish the applicable regulatory requirement and then determine whether an RECD is an appropriate solution.

What Generator Owners Should Verify Before Buying

A responsible procurement process should establish the exact engine model and gross mechanical power, identify the proposed RECD model, verify the applicable Phase, obtain relevant Type Approval information and determine which testing agency is associated with the documentation. The owner should also understand what is included in installation, what maintenance will be required and how warranty and spare-parts support will be handled. CPCB's official Generator Sets resources also provide Type Approval/COP-related information, which can be used alongside the RECD procedure during verification. Because regulatory information can change, buyers should always verify the current official position before making a compliance-related purchase decision.

Frequently Asked Questions

Does every diesel generator legally require an RECD?

Not necessarily. RECD applicability depends on the specific engine, applicable regulatory requirements and current official directions. Owners should verify the requirements for their particular DG rather than assuming a blanket obligation.

What is the maximum engine power covered by the CPCB RECD procedure?

800 kW gross mechanical powerThe published CPCB procedure covers diesel power-generating-set engines up to .

Is a DG's kVA rating enough to select an RECD?

No. CPCB's published manufacturer information states that the RECD-plus-engine combination is tested for mechanical gross power in kW, and the corresponding kVA should be checked against the engine and DG nameplates.

Which documents should a buyer request from an RECD manufacturer?

At minimum, ask for the exact RECD model, applicable engine range, relevant Type Approval/testing documentation, certification agency information and installation requirements.

Does installing an RECD automatically make a DG fully compliant?

No. Product approval, correct installation and site-specific regulatory compliance are separate considerations. The current requirements applicable to the particular DG and location should be verified directly with official sources.

Conclusion

An RECD can be an important emissions-control option for applicable diesel generators, particularly when an existing DG remains a valuable asset and a documented retrofit pathway is appropriate. The most important point for generator owners is to avoid treating “CPCB compliance” as a simple product label. CPCB's published framework is based on specific engine applications, gross mechanical power, testing, Type Approval and Conformity of Production. Before purchasing, identify the exact DG engine, verify the proposed RECD model and review the relevant supporting documentation. Then consider installation, exhaust-system requirements, maintenance and long-term service. The right way to approach RECD is not “every DG needs the same device,” but “every applicable DG should be evaluated against the current requirements and the technically appropriate retrofit solution.”

Why Every Diesel Generator Needs an RECD for CPCB Compliance

Everything Diesel Generator Owners Need to Know About the Rules Driving This Requirement