A facility can spend heavily on emission-control equipment and still end up with an incomplete compliance position. That is because RECD compliance for diesel generators depends on more than purchasing a device — it requires the correct regulatory interpretation, engine-specific selection, controlled installation, traceable documentation, and continuing maintenance.
An RECD, or Retrofit Emission Control Device, is added to an existing diesel generator’s exhaust system to reduce specified pollutants. The technology may use filtration, catalytic treatment, or a combination of methods. However, even a technically capable product can become unsuitable when it is applied to the wrong engine or managed poorly after installation.
Assuming Every DG Set Follows the Same Requirement
The first mistake often occurs before a supplier is contacted. Owners may assume that one RECD rule applies uniformly to every diesel generator in India. Requirements can differ according to location, engine capacity, manufacturing date, technical configuration, operating purpose, and directions issued by the relevant authority. Regulations for newly manufactured engines should not automatically be confused with retrofit requirements for existing DG sets.
Regional differences are particularly important. A requirement applying within the National Capital Region may not apply identically in another state. Likewise, operating restrictions introduced during periods of poor air quality may be separate from the product requirements governing an RECD. Before preparing a technical specification, owners should identify the exact notice, consent condition, project requirement, or official direction applicable to the site.
Treating a Marketing Phrase as Evidence
Expressions such as “CPCB approved,” “government certified,” and “100% compliant” can sound conclusive, but they are not substitutes for model-specific documentation. The buyer should ask which certificate, test report, approval-related record, or regulatory procedure supports the claim. The document should identify the relevant manufacturer, model, engine or power category, tested pollutant, and technical conditions.
A common error is checking only the first page. Annexures may contain important limitations regarding product configuration, capacity, test conditions, installation, or maintenance. Full and legible documents should be reviewed. Company-level registrations and ISO management-system certificates can provide information about the business, but they should not be treated as proof that a particular RECD has achieved a stated emission result.
Choosing a Device From the kVA Rating
A generator’s kVA rating is useful for an initial enquiry, but it is not enough to finalise an RECD. Engines installed in DG sets of similar capacity may have different exhaust-flow rates, temperature behaviour, and allowable backpressure. The manufacturer should review the engine make, model, rated output, exhaust-pipe dimensions, existing silencer, typical operating load, and running hours. It should also inspect available space and future maintenance access.
Finalising the product before completing this assessment can result in an unsuitable treatment capacity, unexpected fabrication, poor regeneration, or excessive exhaust restriction. If the required engine data is unavailable, the supplier should identify the missing information and explain how it will be obtained. Assumptions should not be hidden inside a generic quotation.
Failing to Examine the Manufacturer’s Role
The company issuing the quotation may not be the original manufacturer. It could be a distributor, installer, fabricator, or regional sales partner. This arrangement can work well when responsibilities are transparent. Problems arise when the seller, manufacturer, and installation contractor each assume that another party will handle technical issues or warranty claims.
When selecting an RECD manufacturer in India, buyers should establish who owns the product design, who manufactures the principal treatment unit, who supplies the internal filter or catalyst, and who will support the warranty. If a dealer is involved, its authorisation should be checked with the original manufacturer. The contract should also state who remains responsible if installation is completed by a third-party contractor. A manufacturer should not accept the installation order and then disclaim responsibility for every site-related problem.
Allowing Uncontrolled Changes During Installation
Space limitations can tempt installers to modify an RECD or its piping without proper technical review. The housing may be shortened, sensor positions changed, additional bends introduced, or access sections relocated. Such changes can affect exhaust distribution, monitoring accuracy, service access, and backpressure. They may also cause the delivered system to differ from the configuration described in its supporting documents.
The installation should follow an approved drawing. Any change required at the site should be reviewed and accepted by the responsible manufacturer before fabrication proceeds. Structural support is equally important. The RECD’s weight should not be transferred improperly to the engine manifold or existing pipe. Exhaust joints need adequate sealing, while the arrangement should account for heat, vibration, and thermal expansion.
Forgetting About Backpressure After Commissioning
Backpressure is not merely an installation-day measurement. It can change as soot accumulates or as the exhaust system is modified. Owners should understand how pressure is measured and what reading indicates a need for maintenance. Depending on the design, monitoring may involve a gauge, sensor, differential-pressure system, alarm, or controller display.
A common operating mistake is resetting an alarm without investigating its cause. If the filter is heavily loaded, clearing the indication does not remove the exhaust restriction. Pressure readings should be recorded over time. A gradual change may reveal a maintenance need before it develops into a generator-performance problem.
Accepting a Superficial Commissioning Report
Commissioning should prove that the correct device has been installed on the identified generator and that its monitoring functions are operational. A report containing only the words “tested and found satisfactory” provides limited evidence. The commissioning record should identify the engine, DG set, RECD model, and serial number. It should document the completed arrangement and record relevant operating observations, including pressure, temperature, alarm status, or generator load where applicable.
If a performance test is required by the contract or competent authority, the method and testing conditions should be agreed in advance. A brief visual smoke check is not equivalent to a defined emission test. Facility personnel should also receive practical instruction. Operators need to know what the indicators mean, how to respond to an alarm, and when to contact qualified service support.
Letting Documents Become Separated
Compliance records often become scattered across departments. Procurement retains the quotation, accounts keeps the invoice, engineering holds the drawing, and the maintenance contractor stores service reports. When an inspection or warranty claim occurs, the owner may be unable to connect the installed unit with its original evidence. A central file should link the generator’s engine details to the RECD model and serial number. It should include the applicable regulatory basis, supporting product documents, approved drawing, purchase order, invoice, commissioning report, operating manual, warranty, training record, and maintenance history.
If internal components are replaced, the record should identify the replacement and confirm its suitability for the model. Continuing to use the original documents after an unauthorised component change can create a misleading compliance trail.
Treating Maintenance as Optional
An RECD is not a permanent passive attachment that can be forgotten once installed. Filters can load with soot, catalysts can deteriorate, sensors can fail, and exhaust joints can loosen. Maintenance needs vary with the technology, engine condition, operating hours, load, and fuel quality. The manufacturer should provide written instructions covering inspection, regeneration or cleaning, alarm response, and replacement components.
Owners should be cautious about universal “zero-maintenance” claims. Even a system with long service intervals generally requires observation and condition checks. Missed maintenance can affect performance, engine backpressure, and warranty coverage. Keeping detailed service records is therefore part of responsible operation.
Relying on Outdated Regulatory Information
Regulatory requirements can be amended, clarified, extended, or replaced. An article, circular, or certificate collected during procurement may not describe the position in force when the generator is later operated. Current national-level information should be checked through the Central Pollution Control Board. Owners should also consult the relevant state pollution control board or pollution control committee.
Facilities in NCR should review the latest directions and GRAP-related updates from the Commission for Air Quality Management. CAQM publications have addressed regulated DG-set operation across industrial, commercial, residential, and other sectors, but applicability should always be confirmed against the latest official material. An installed RECD should not be assumed to provide unrestricted permission to operate a DG set during every air-quality restriction.
Frequently Asked Questions
Is a CPCB-related certificate enough to prove compliance?
Not by itself. The document must be relevant to the offered model, engine category, installation, and applicable current requirement.
Can an RECD be selected using only DG capacity?
No. Engine model, exhaust flow, temperature, backpressure, load pattern, and site conditions should also be assessed.
Why should backpressure be monitored regularly?
Soot accumulation or exhaust-system changes can increase restriction over time and potentially affect generator operation.
Does installing an RECD allow a DG set to run during all restrictions?
No. Separate operating controls, GRAP measures, consent conditions, or local directions may continue to apply.
What records should the owner preserve?
Keep engine data, product documents, model and serial details, drawings, invoices, commissioning records, operating instructions, warranties, and maintenance reports.
Conclusion
Most RECD compliance problems are not caused by a single dramatic failure. They develop through small decisions: an unchecked certificate, an incorrect engine detail, an unauthorised installation change, an ignored alarm, or a missing maintenance record. Aceget can assist organisations considering retrofit emission-control systems for existing generators. Buyers should still verify the model-specific evidence, technical compatibility, contractual scope, and current regulatory position independently. Avoiding these common mistakes creates a stronger connection between the product purchased, the system installed, and the compliance records retained.