Choosing a Retrofit Emission Control Device (RECD) for a diesel generator should involve more than comparing quotations and product brochures. A factory visit gives buyers an opportunity to understand how an RECD is actually designed, manufactured, tested and prepared for installation.
A supplier may provide certificates and technical documents, but visiting the manufacturing facility can reveal important details about material traceability, fabrication practices, quality checks, testing facilities and service capabilities. Asking the right questions during the visit can therefore help organisations make a more informed technical decision.
Start With Certification and Product Information
One of the first areas to discuss is the certification status of the RECD models being offered.
Ask the manufacturer which specific models are certified and what engine power ranges they cover. It is also useful to understand how the supplier tracks certification validity and production-related compliance checks.
Instead of accepting only a brochure or presentation, request to see the relevant certificates and supporting documentation. Check whether the model being proposed actually corresponds to the DG set for which you are planning the installation.
For additional guidance, buyers can also review Aceget's detailed article on questions to ask during an RECD factory visit.
Ask About Raw Materials and Traceability
The manufacturing process starts well before welding and assembly. Ask what grades of stainless steel are used for the RECD body, flanges and internal components.
A useful question is whether the manufacturer can show material certificates and explain how those documents are connected to the material used in production.
You can also ask:
How are incoming materials inspected?
How are rejected materials separated?
How are filter substrates stored?
Are component serial numbers maintained?
Can individual materials be traced to the finished RECD?
Good traceability can make quality investigations and future service considerably easier.
Understand the Fabrication and Welding Process
The fabrication area is one of the most useful places to observe during a factory visit. Ask how the manufacturer controls welding quality and dimensional accuracy.
Questions can include:
Are welding procedures documented?
How are welds inspected?
Are fixtures or jigs used for repeat production?
How are flange dimensions verified?
How are customer-specific inlet and outlet configurations handled?
Look at actual work in progress rather than only finished demonstration units. This can provide a better understanding of how consistently the manufacturing process is controlled.
Ask How the Filter Element Is Installed
The filter assembly is a critical part of an RECD. Buyers should understand how the substrate is mounted and protected inside the housing.
Ask how the filter element is installed, how the supporting material is handled and how the manufacturer prevents exhaust gas from bypassing the intended filtration path.
It is also worth asking whether the filter element has an individual identification or serial number and whether that number can be connected to the finished RECD.
This type of traceability can become particularly valuable when replacement components are required later.
Check the Testing and Quality-Control Process
Testing should be another major part of the factory discussion. Ask what checks are performed before an RECD leaves the manufacturing facility.
Possible questions include:
Is pressure-drop testing performed?
Are leakage checks carried out?
How is the monitoring or control system tested?
What parameters are recorded during factory testing?
Can customers witness a Factory Acceptance Test (FAT)?
What happens when a unit fails an internal quality check?
Also ask to see the calibration status of important testing instruments.
For laboratories and calibration activities, buyers can refer to the National Accreditation Board for Testing and Calibration Laboratories (NABL) and its published accreditation information. NABL India
NABL India – Official Accreditation Information
Discuss Installation and Engineering Support
A technically suitable RECD still needs to be correctly matched with the DG set and exhaust arrangement.
Ask the manufacturer what information they require before selecting a model. A serious technical evaluation may involve engine make and model, rated capacity, exhaust conditions, available installation space and other relevant operating information.
You should also ask whether the supplier provides site surveys, installation drawings, backpressure assessment and commissioning support.
This helps establish whether the manufacturer is supplying a standard product or actually evaluating the requirements of your particular DG installation.
Ask About Service, Spares and Warranty
The factory visit is also a good opportunity to discuss what happens after installation.
Ask:
Where are service engineers located?
What is the expected response process?
Which spare parts are normally stocked?
How are replacement filter elements identified?
What does the warranty cover?
What are the exclusions?
Is operator training provided?
These questions can help you evaluate the complete lifecycle support rather than focusing only on the initial equipment price.
Observe Packing and Dispatch Practices
Before finishing the visit, take a look at the packing and dispatch area.
Ask how the RECD is protected during transportation, especially if the system contains sensitive filter elements, sensors or controllers. Find out how accessories, documents and identification labels are packed.
A properly organised dispatch process should make it easier to confirm that the correct model and accessories reach the project site.
Create a Factory-Visit Checklist
It is useful to score suppliers using the same checklist. Consider categories such as:
Certification and documentation
Material traceability
Fabrication quality
Filter assembly
Testing and calibration
Installation support
Spare parts
After-sales service
Packing and delivery capability
Using the same criteria for every shortlisted supplier makes the final comparison more objective.
For larger projects, buyers can also review Aceget's guidance on Factory Acceptance Tests and Site Acceptance Tests for RECD projects. Aceget
Final Thoughts
An RECD factory visit should not be treated as a simple supplier meeting. It is an opportunity to verify whether the manufacturer's documentation, production practices, testing procedures and support infrastructure match the requirements of your project.
Ask to see evidence rather than relying only on verbal assurances. Review certificates, inspect manufacturing processes, understand testing procedures and discuss installation and after-sales support before finalising the system.
A well-planned factory visit can therefore help buyers identify potential issues early and select an RECD solution with greater confidence.