EPA NSPS JJJJ (Quad J) Compliance Calendar Software
EPA's NSPS Subpart JJJJ (40 CFR 60 Subpart JJJJ) establishes emission standards for stationary spark ignition internal combustion engines, covering everything from small emergency generators to large natural gas compressor engines used in oil and gas operations. The standard sets emission limits for NOx, CO, and VOC, and requires performance testing, manufacturer-specified maintenance, and ongoing compliance documentation.
Our NSPS JJJJ Compliance Calendar Software and mobile app tracks every performance test, maintenance interval, compliance report, and recordkeeping requirement across your entire engine fleet.
Engine Categories
Rich-Burn Engines
- Operate at or near stoichiometric air-fuel ratio
- Typically controlled with NSCR (3-way catalyst)
- Most common in natural gas compression
- Stricter NOx limits (generally 1.0 g/HP-hr for >500 HP)
- Performance testing or manufacturer certification required
- Catalyst monitoring and maintenance critical
Lean-Burn Engines
- Operate with excess air beyond stoichiometric ratio
- May use oxidation catalyst for CO/VOC control
- Common in power generation and compression
- Different NOx limits than rich-burn (generally 2.0 g/HP-hr for >500 HP)
- Performance testing or manufacturer certification required
- Engine tuning and air-fuel ratio management critical
Key NSPS JJJJ Compliance Deadlines
Initial Performance Test
Conduct initial performance testing within 240 days of startup for non-certified engines to demonstrate compliance with NOx, CO, and VOC emission limits.
Subsequent Performance Tests
Conduct subsequent performance tests every 8,760 hours of operation or every 3 years, whichever comes first, for engines >500 HP that use testing for compliance.
Maintenance Plan Requirements
Follow the manufacturer's emission-related maintenance schedule. Key items include spark plugs, oil changes, air filters, catalyst inspection, and engine tune-ups.
Catalyst Inspection & Replacement
Inspect oxidation catalysts (lean-burn) and NSCR catalysts (rich-burn) per manufacturer recommendations. Replace when catalyst efficiency degrades.
Operational Hour Tracking
Track engine operating hours to determine performance test scheduling, distinguish emergency vs. non-emergency operation, and calculate annual emissions.
Fuel Quality Monitoring
Monitor and document fuel quality (heating value, sulfur content) as emission limits and compliance approaches depend on fuel specifications.
Compliance Reports
Submit semi-annual compliance reports per 40 CFR 60.7 for engines that conduct performance testing, including test results and any deviations.
Initial Notification
Submit initial notification to EPA or delegated state agency within 60 days of initial startup of an affected engine.
Recordkeeping Retention
Maintain all records of performance tests, maintenance activities, operating hours, fuel quality, and compliance reports for at least 5 years.
Emergency Engine Hour Tracking
Track emergency engine operating hours to ensure compliance with the 100-hour (demand response) and 500-hour annual limits for emergency-designated engines.
Software Features for NSPS JJJJ Compliance
Performance Test Scheduling
Schedule initial and subsequent performance tests based on operating hours or calendar intervals for each engine.
Maintenance Plan Tracking
Track manufacturer maintenance schedules including spark plugs, oil changes, filters, catalysts, and engine tune-ups.
Engine Inventory Management
Maintain a complete engine inventory with HP rating, fuel type, manufacture date, certification status, and compliance pathway.
Operating Hour Tracking
Track engine operating hours for performance test scheduling, emergency engine limits, and emissions calculations.
Catalyst Management
Schedule catalyst inspections, track efficiency, and manage replacement cycles for NSCR and oxidation catalysts.
Compliance Reporting
Generate semi-annual compliance reports with test results, maintenance records, and deviation summaries.
Multi-Site Engine Fleet
Manage compliance across dozens or hundreds of engines at multiple locations with site-specific schedules.
Mobile App
Log engine hours, conduct inspections, and document maintenance from the field with our mobile app.
