In short. Installation is where retrofit succeeds or fails. Exhaust routing, support and expansion, insulation, sensors, controls and reagent systems must be engineered together, then commissioned with measured back-pressure and temperature under load.
Mechanical
- Support the weight independent of the engine exhaust outlet.
- Allow thermal expansion with flexible joints.
- Keep bends and length low to limit back-pressure.
- Insulate hot surfaces and guard personnel areas.
- Provide access for filter service and ash removal.
Controls and sensors
| Signal | Use |
|---|---|
| Inlet and outlet temperature | Regeneration control and protection |
| Differential pressure | Filter loading |
| Engine run and load status | Control logic |
| Alarms | Operator and remote alerts |
Integrate alarms with the genset controller and plant monitoring. See controls logic.
Reagent system (if SCR)
Urea storage, pump, dosing and heating where needed, with quality checks. Plan for freezing or heat issues, and supply logistics.
Commissioning
- Cold checks: leaks, supports, wiring.
- Run at stepped loads; record back-pressure and temperature.
- Test alarms and trips.
- Verify regeneration behaviour.
- Hand over records and operating limits. See commissioning.
Illustrative example
A device installed with long, many-bend piping gives high back-pressure at full load. A re-route with fewer bends restores margin; the commissioning log shows the improvement.
Thermal expansion and supports
Steel exhaust pipe grows as it heats. A rigid connection between the engine and a fixed structure transfers that growth as force onto the turbocharger or manifold. Use flexible bellows near the engine, supports that allow sliding, and a fixed point chosen deliberately. Support the catalyst and filter housing on their own frame, because their weight can be considerable.
Insulation and safety
- Insulate exhaust surfaces that people can reach.
- Keep combustible materials away from hot parts.
- Route the discharge away from air intakes, windows and walkways.
- Provide warning signs.
Reagent system details (SCR)
| Item | Consideration |
|---|---|
| Storage tank | Material compatible with urea; vented; sized for refill interval |
| Quality | Use urea solution to the recognised specification; check strength |
| Temperature | Urea freezes at low temperatures and degrades with prolonged heat; site conditions matter |
| Dosing pump and injector | Accessible for service; protected from heat |
| Supply logistics | Reliable local source; storage shelf life |
Controls integration
- Wire alarms to the genset controller and to the plant monitoring system.
- Decide the response to alarms: warn, derate or stop. Consult the engine maker.
- Log differential pressure, temperature and dosing.
- Ensure the device does not interfere with emergency starting of a life-safety set unless the design allows.
Commissioning record
For each load step, record exhaust temperature, back-pressure, and any alarms. Include photos of the installation, drawings as built, and the control settings. Hand over a short operating instruction for the shift staff.
Planning the outage
Installation needs the set out of service. For a critical facility, arrange temporary power for the period, and test the original set again before returning it to service. See rental power.
The master engineering question
At full load, what do the pressure and temperature readings say about the installed system?
What to send us
Send site layout and exhaust drawings. Send your application details. See operation and maintenance.
Questions engineers ask
Can the old silencer stay?
Depends on layout and back-pressure; assess.
Who supports the weight?
Dedicated supports, not the engine outlet.
Is a shutdown needed?
Plan a window and a backup source.
What records to keep?
Commissioning data, alarms, settings.
General guidance only. Follow device maker instructions.