Industrial diesel engines power factory equipment – air compressors, forklifts, aerial lifts, sweepers, pumps, refrigeration units, and standby fire pumps. These engines operate indoors or in semi-enclosed spaces, where emissions directly impact worker health. Regulations: EPA Tier 4 Final, EU Stage V, China Stage IV. Our systems provide validated DOC, DPF, SCR, and ASC solutions for 19 kW to 1+ MW industrial engines, ensuring zero toxic emissions.
Indoor operation requires extremely low emissions: CO (<50 ppm PEL), NO₂ (<5 ppm PEL), NH₃ (<25 ppm). Ventilation may be limited. Visible smoke or odors are unacceptable during regeneration. Our systems deliver near-zero emissions with active thermal management, electric regeneration, and fail-safe controls.
Configuration | Typical Equipment |
Indoor / enclosed | Engine → DOC → DPF → SCR → ASC → Tailpipe (ducted outdoors or high-efficiency indoor filter) |
Outdoor / semi-enclosed | Engine → DOC → DPF → SCR → Tailpipe |
Converts CO and HC. Reduces CO from 100–500 ppm to <10 ppm. Oxidizes NO to NO₂ for SCR.
Traps soot and ash. Electric regeneration preferred – no fuel odor. Active regen <2 min. Serviceable for indoor ash cleaning.
Primary NOx removal. Cu-zeolite or vanadia depending on temperature. DEF dosing controlled via NH₃ sensor feedback for zero slip.
Reduces NH₃ slip to <5 ppm in indoor/limited-ventilation applications. Pt on alumina downstream of SCR.
Critical for indoor cold starts and low-load operation. Reaches 200°C light-off in <60 s. Battery or grid-powered.
Pollutant | Engine Out | After Aftertreatment | OSHA PEL (8-hour) | Workplace Target |
CO | 100–500 ppm | <10 ppm | 50 ppm | <10 ppm |
NOx (NO₂) | 100–500 ppm | <50 ppm (combined) | 5 ppm | <3 ppm |
PM | 0.1–0.5 g/kWh | <0.01 g/kWh | 5 mg/m³ | <1 mg/m³ |
NH₃ slip | N/A | <5 ppm | 25 ppm | Undetectable |
HC | 50–200 ppm | <10 ppm | N/A | <10 ppm |
Industrial Equipment | Power Range | Environment | Aftertreatment | Key Requirements |
Rough-terrain forklift | 50–150 kW | Outdoor + indoor warehouse | DOC + DPF + SCR + ASC | Zero NH₃ slip indoors |
Aerial lift | 20–50 kW | Indoor warehouse + outdoor | DOC + DPF | Lightweight, compact |
Industrial sweeper | 20–75 kW | Indoor | DOC + DPF + ASC | Electric regen, no odor |
Air compressor | 50–300 kW | Factory equipment room | DOC + DPF + SCR + ASC | Continuous duty, quiet |
Refrigeration unit | 20–50 kW | Loading dock | DOC + DPF | Cold start, low load |
Fire pump | 100–500 kW | Indoor pump room | DOC + DPF | Emergency start, long idle |
Manlift / telehandler | 50–150 kW | Indoor/outdoor | DOC + DPF + SCR + ASC | Operator breathing zone <1 ppm NO₂ |
Emissions monitored at operator breathing zone. CO <10 ppm, NO₂ <3 ppm, NH₃ undetectable. Fail-safe shutdown if aftertreatment fails.
Electric DPF regeneration, <2 min active regen, no odor, limited heat. Regeneration inhibit in occupied areas.
Electric pre-heater (eSCR) for light-off without engine warm-up. Maintains catalyst temp during idle. Battery-powered heaters for hybrid industrial equipment.
DPF traps >99% soot. Catalysed DPF for HC/CO polishing. No smoke or odor during regen.
Side- or roof-mounted DPF/SCR. Low-profile heat shields. Designed for narrow aisles and operator safety.
Serviceable DPF, quick-release clamps, remote service indicators. Fleet telematics for centralized monitoring.
Operator breathing zone monitoring, ventilation assessment, fail-safe controls. Proven in food plants, warehouses, assembly, chemical facilities.
Electric DPF/eSCR regen, instant light-off, certified for occupied spaces.
Electric catalyst heating, automatic idle management, intermittent duty cycle solutions.
Remote monitoring, predictive maintenance, automated compliance reporting.
From 20 kW aerial lifts to 300 kW air compressors, our industrial diesel aftertreatment solutions deliver worker-safe emissions, indoor-compatible regeneration, and regulatory compliance without productivity compromise. Partner with us to engineer your path to cleaner factory operations.