RECD mandatory for DG sets IndiaWhen evaluating , technical specifications are just as important as regulatory requirements. A generator owner may know that an emission-control device is being considered, but choosing the correct system requires a closer look at engine power, RECD application range, certification documents, exhaust conditions, monitoring features, installation requirements, and maintenance.

CPCB has established a technical procedure for RECD compliance covering applicable diesel power-generating set engines up to 800 kW gross mechanical power. The published testing documentation identifies parameters such as the base engine, engine model, rated power and speed, RECD family, model, identifying part numbers, emission measurements, smoke, exhaust back pressure, regeneration characteristics, and application range.

This makes a specification-based approach particularly useful when comparing RECD solutions.

What Should an RECD Specification Include?

A proper RECD quotation should contain much more information than a product name and price.

At a minimum, buyers should be able to identify:

RECD manufacturer
RECD family
Exact model
Part number
Applicable engine type
Engine power range
Rated speed range, where applicable
Certification or test documentation
Exhaust configuration
Controller and sensor details
Installation requirements
Maintenance requirements
Warranty terms

CPCB's published RECD test documentation specifically identifies the RECD family, type/model, identifying part numbers, and the engine types for which the device is qualified.

That information can help buyers connect the product being offered with the technical evidence supporting its application.

1. Start With the Engine Specification

The first specification to verify is not the RECD itself.

It is the engine.

Record:

Engine manufacturer
Engine model
Engine serial number
Number of cylinders
Rated power
Rated speed
Gross mechanical power
Engine configuration
Existing emission-control equipment

CPCB's RECD test report format includes detailed base-engine information, including engine manufacturer, model, rated power, rated speed, and other technical characteristics.

This is important because an RECD should be selected according to the documented engine application rather than simply the commercial kVA rating of the generator.

2. Check Gross Mechanical Power

Gross mechanical power deserves special attention.

CPCB's RECD framework is associated with diesel power-generating set engines up to 800 kW gross mechanical power.

Generator owners should therefore obtain the engine's documented mechanical power before selecting an RECD.

Do not assume that:

Generator kVA = Engine gross mechanical power

These are different technical specifications.

Use the engine manufacturer's documentation wherever possible.

3. Verify the RECD Application Range

One of the most important documents to request from a supplier is the application's qualified engine range.

engine type(s) for which the REC device is qualifiedCPCB's published RECD test report format includes an enclosure identifying the .

This provides a useful buying principle:

Match the documented RECD application with the actual engine.

Do not select a device merely because the supplier says it is suitable for “all generators.”

Ask for specific compatibility information.

4. Verify the Exact RECD Model

An RECD manufacturer may offer several models or product variants.

Therefore, record:

Product family
Model number
Part number
Serial number
Product classification
Applicable engine range

The exact model should correspond with the relevant certification or testing documentation.

A certificate referring to one model should not automatically be assumed to cover another model.

5. Examine Certification and Testing Documents

A serious compliance review should include documentary verification.

Ask the supplier for the relevant:

Type Approval documentation
Test report
Certificate number
Test date
Tested engine details
RECD model
Application range
Performance results

CPCB's test-report format contains fields for certificate number, report number, test date, manufacturer, base engine information, RECD model, test procedure, and performance results.

This level of detail is useful because it allows the buyer to compare the product offered with the product that was actually tested.

6. Check Particulate Reduction Performance

Particulate matter is a central consideration in the RECD framework.

CPCB's technical material states that the RECD standard was developed for particulate-control measures for gensets up to 800 kW mechanical gross power and references a minimum specified PM-capturing efficiency of 70% for the applicable in-use DG-set category discussed in the document.

However, buyers should avoid relying on a percentage printed in a marketing brochure.

Instead, request documented test information and understand:

Baseline PM result
RECD-fitted PM result
Reduction efficiency
Test procedure
Applicable engine
Test conditions

CPCB's test report format specifically provides fields for baseline emissions, RECD-fitted emissions, PM results, and reduction-related evaluation.

7. Review Smoke Performance

Smoke is another parameter included in the CPCB RECD test documentation.

The test procedure references measurement of exhaust-gas smoke according to ISO 8178 Part 3.

When reviewing a technical proposal, ask whether the available test documentation includes smoke-related results.

The goal is to understand the complete performance of the system rather than evaluating only one headline specification.

8. Check Exhaust Back Pressure

An RECD is installed into the exhaust system, so exhaust back pressure must be considered.

exhaust back pressure requirementCPCB's test documentation specifically includes an as part of the performance evaluation.

Before installation, establish:

Existing exhaust back pressure
Expected back pressure after retrofit
Engine manufacturer's permissible limit
Exhaust pipe dimensions
Silencer arrangement
RECD installation position

This should be evaluated by a qualified technical team.

A physically compatible installation is not necessarily a technically acceptable installation if exhaust restrictions are not properly assessed.

9. Understand Regeneration Requirements

Some emission-control technologies require regeneration or another process to manage accumulated particulate matter.

CPCB's published RECD test documentation includes evaluation of regeneration strategy and regeneration characteristics.

Before purchasing, ask:

Is regeneration required?
How is it initiated?
How frequently is it expected?
Is it automatic?
What operating conditions are necessary?
What warning is provided to the operator?
What maintenance is involved?

The answers should be included in the operating instructions.

10. Check Controller and Diagnostic Features

An RECD installation may include an electronic controller and sensors.

Depending on the product, these can help monitor operating conditions and system status.

Ask the supplier to explain:

Controller functions
Sensor types
Warning indicators
Alarm functions
Fault codes
Data logging
Diagnostic procedure
Failure response

CPCB's technical documentation includes requirements associated with compatibility with OBD/PCD requirements and particulate-related diagnostics.

Operators should understand the meaning of system warnings before the equipment enters regular service.

11. Evaluate the Complete Exhaust Installation

An RECD should not be considered independently of the exhaust system.

Check:

Exhaust Diameter

Will the existing pipe arrangement accommodate the proposed equipment?

Mounting

Is the supporting structure suitable?

Access

Can technicians reach the equipment for inspection?

Heat

Are surrounding components protected appropriately?

Sensors

Can sensors be installed in the required positions?

Controller

Is the controller protected and accessible?

Maintenance

Can service work be completed without unnecessary dismantling?

These details can affect both reliability and long-term operating cost.

12. Check Fuel and Engine Condition

The emission-control device is only one part of the generator system.

Before installation, inspect the engine's general condition.

Review:

Fuel system
Lubricating system
Air intake
Filters
Turbocharger
Cooling system
Exhaust system
Engine performance

An RECD should not be used as a substitute for correcting mechanical or combustion problems.

A well-maintained engine provides a better foundation for an emission-control installation.

13. What Does “CPCB Approved” Really Mean?

The phrase “CPCB approved” should be treated as a claim that requires verification.

A buyer should ask:

Which product?

Which model?

Which engine?

Which power range?

Which certificate?

Which test report?

CPCB's technical documentation provides identifiable fields for these details, making it possible to perform a more meaningful document review.

The important point is to verify the specific product rather than accepting a broad statement about the company.

14. What Is a DG Set Pollution Control RECD System?

DG set pollution control RECD systemA can include more than the main emission-control unit.

Depending on the technology, the complete package may contain:

RECD equipment
Controller
Sensors
Exhaust connections
Mounting components
Electrical components
Warning system
Diagnostic functions

complete scope of supplyTherefore, compare suppliers using the , not just the quoted price of the main RECD.

A lower initial price may not be comparable if another quotation includes controllers, sensors, installation, commissioning, training, and warranty support.

15. Questions to Ask Before Signing the Purchase Order

Before finalizing the supplier, request written answers to these questions:

What exact RECD model is being supplied?
Which engine models are covered?
What gross mechanical power range applies?
What certification documents are available?
Which engine was used for testing?
What are the documented PM results?
What is the expected exhaust back pressure?
Is regeneration required?
What controller and sensors are included?
What installation modifications are required?
What maintenance is necessary?
What warranty is offered?
What service coverage is available?
Which spare parts are normally required?
What documents will be supplied after commissioning?

Written responses make procurement decisions easier to audit later.

16. Compliance Is More Than Equipment

An important point for facility managers is that product selection alone does not establish complete environmental compliance.

A broader assessment can involve:

Applicable requirement

+ Appropriate product

+ Correct engine application

+ Proper installation

+ Appropriate operation

+ Maintenance

+ Documentation

The exact requirements depend on the generator and regulatory circumstances.

Therefore, an RECD purchase should be integrated into the facility's overall environmental management process.

17. Keep a Technical Record After Installation

Once the RECD has been installed, update the DG-set documentation.

Keep:

Final RECD model
Serial number
Certification documents
Installation report
Commissioning report
Controller configuration
Sensor details
Warranty
Maintenance schedule
Service reports
Fault history

This record can be useful for future servicing, troubleshooting, internal audits, and regulatory verification.

Frequently Asked Questions

What specifications are most important when choosing an RECD?

Engine model, gross mechanical power, rated speed, RECD application range, certification documentation, exhaust back pressure, installation requirements, and monitoring features are among the key areas to review.

Is generator kVA enough to select an RECD?

No. The engine's documented gross mechanical power and application details should also be checked.

What does CPCB's RECD procedure cover?

The published procedure provides a technical framework for compliance testing of retrofit emission-control devices for applicable diesel power-generating set engines up to 800 kW gross mechanical power.

Should I ask for the test report?

Yes. A product-specific test or certification document can help establish what product and engine application were evaluated.

Why is exhaust back pressure important?

An RECD becomes part of the exhaust system, so its effect on exhaust restriction should be evaluated against the engine's permissible operating conditions.

Does an RECD certificate guarantee complete legal compliance?

No. Certification is one part of the evaluation. Applicability, installation, operation, maintenance, documentation, and other current regulatory requirements should also be considered.

Final Checklist for Generator Owners

Before purchasing an RECD, make sure you can answer all of these questions:

Do I know my engine model?

Have I confirmed gross mechanical power?

Do I know the exact RECD model being offered?

Can the supplier provide relevant certification and test documentation?

Does the documented application cover my engine?

Have exhaust back pressure and installation conditions been evaluated?

Do I understand the controller and diagnostic functions?

Do I know whether regeneration or special maintenance is required?

Have warranty and service arrangements been documented?

Have I checked the latest applicable regulatory requirements?

If several answers are “no,” the purchase should be reviewed before proceeding.

Conclusion

RECD mandatory for DG sets IndiaDG set pollution control RECD systemTechnical specifications should be at the center of any decision concerning . An RECD is not simply an exhaust component that can be selected from a catalogue based on generator capacity. For buyers, this creates a practical verification path: identify the generator, confirm its engine specifications, match the RECD application, verify the relevant documentation, assess the exhaust installation, and establish a maintenance and support plan. For facilities considering a , comparing complete technical specifications is far more useful than comparing prices alone. A properly documented quotation should clearly explain what equipment is supplied, which engine it is intended for, what certification supports the product, what installation involves, and what ongoing support is available.

RECD Mandatory for DG Sets India: Specifications & Compliance Checklist

What to Look For - Technical Specs, Certification & Compliance - Before Making a Decision