Preparing the fitment studio
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▪ Fitment studio
Fit any Maxmoc system to your genset, ship or truck
Choose a genset from 15 to 1500 kVA, a marine engine up to 8 MW or a diesel truck, pick the system, watch it go on step by step and follow live readings as the exhaust is cleaned or the engine switches to dual-fuel.
Genset rating
Variant
Add-ons
Selected system
RECD
Retrofit emission control for installed DG sets, mounted on the canopy roof in a single shift.
- DOC + wall-flow DPF
- ΔP and temperature sensors
- Online monitoring
- Norm
- CPCB IV+ · 56 to 560 kW
- Lines
- 1
Live telemetry
Before the fit
Run time 0:00 · sampled every 0.5 s
Readings are simulated from typical results to show how each system behaves. Pollution control boards ask for at least 70 % particulate capture from an RECD. Your own figures come from the site survey and the emission test after installation.
▪ From the field
Survey
Engine data, exhaust temperatures, layout and the backpressure budget.
Design
System sized and routed for the engine, supports checked against the structure.
Install
Fitted by Maxmoc engineers, usually within a single shift per module on gensets.
Verify
Emission test after install and a compliance file for the regulator or class.
▪ Tier III architecture
Tracing the Maxmoc SCR
A seven-minute tour of a Tier III SCR line: the pollutants it targets, the urea supply and dosing layout, the control loop that follows load swings, the cartridge stack and the reaction on the substrate.
▪ The limits
Emission limits for genset CI engines up to 800 kW
Values in g/kWh on the constant-speed or variable-speed test cycle, after deterioration and adjustment factors. Smoke is limited to 0.7 m⁻¹ at every load point. HC is total hydrocarbons for diesel engines.
| Power, kW | NOx | HC | NOx + HC | CO | PM | Typical aftertreatment |
|---|---|---|---|---|---|---|
| P ≤ 8 | – | – | 7.5 | 3.5 | 0.30 | DOC, optional DPF |
| 8 < P ≤ 19 | – | – | 4.7 | 3.5 | 0.30 | DOC, EGR or urea-less SCR |
| 19 < P ≤ 56 | – | – | 4.7 | 3.5 | 0.03 | DOC + DPF, urea-less SCR |
| 56 < P ≤ 560 | 0.40 | 0.19 | – | 3.5 | 0.02 | DOC + DPF + Urea SCR + ASC |
| 560 < P ≤ 800 | 0.67 | 0.19 | – | 3.5 | 0.03 | DOC + DPF + Urea SCR + ASC |
Aftertreatment column is Maxmoc engineering guidance, not part of the notification. The right package depends on the engine-out emissions and duty cycle.
▪ How far the limits moved
A 200 kW genset must now emit up to 90 % less
CPCB II limits for 75 to 800 kW engines (GSR 771(E), from 1 July 2014) compared with CPCB IV+ limits for 56 to 560 kW engines (GSR 804(E), from 1 July 2023). Carbon monoxide stays at 3.5 g/kWh in both.
NOx + HC
−0%CPCB IV+ value is 0.40 NOx + 0.19 HC.
Particulate matter
−0%▪ What it means
Above 56 kW, CPCB IV+ means SCR and DPF
Up to 56 kW
A combined NOx + HC limit of 4.7 g/kWh and, from 19 kW, a PM limit of 0.03 g/kWh. A DOC + DPF handles particulates; where NOx margin is tight, our urea-less Urea-Free SCR avoids an AUS 32 tank on small sets.
Learn more →56 to 560 kW
NOx falls to 0.40 g/kWh and PM to 0.02 g/kWh. In practice that needs urea SCR with an ammonia-slip catalyst plus a wall-flow DPF, as in the Urea SCR platform with closed-loop dosing.
Learn more →560 to 800 kW
NOx 0.67 g/kWh and PM 0.03 g/kWh. Large SCR volumes, careful mixing and thermal management keep conversion high on low-load standby duty.
Learn more →▪ Compliance path
New sets, installed sets and local rules
01
New gensets: type approval
Every engine for genset use up to 800 kW made, assembled or imported in India needs type approval and conformity-of-production certification from ARAI, ICAT or IIP before it can be sold or used.
02
Conformity of production
Production units are re-tested every COP year (1 July to 30 June) against the same limits, including deterioration factors, so aftertreatment must hold its performance over time.
03
Installed DG sets: retrofit
Older sets are not covered by CPCB IV+ type approval, but pollution control boards and CAQM require retrofit emission control devices (RECD) with at least 70 % PM capture efficiency on in-use sets in many regions.
04
Local tightening
CPCB, CAQM and state boards may set stricter local norms. Delhi NCR and several states already restrict DG set operation unless sets are retrofitted or converted to dual fuel.
Sources
- GSR 804(E), MoEFCC, 3 November 2022 (via ARAI)
- Emission limits, applicability, test cycle and requirements (ARAI)
- CPCB system and procedure for genset engines up to 800 kW, 28 March 2023 (via ARAI)
- CPCB system and procedure for emission compliance of DG sets (CPCB II limits)
- Commission for Air Quality Management directions
This page summarises public notifications for general guidance and is not legal advice. Confirm requirements for your site with the certifying agency or your pollution control board.