This is the catastrophic event. As the relief valves reseat, a vacuum forms, drawing fresh air back into the hot crankcase, causing a massive secondary blast.
Use fixed CO2 or steam smothering if the fire is not contained. Performance Monitoring and Troubleshooting
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Bursting discs and non-return valves must be inspected regularly to prevent flame propagation from the cylinder back into the starting air receivers. Exam Preparation Checklist Subject Area Key Focus Points High-Yield Topic Automation PID loops, governor controls, electronic injection Variable Injection Timing (VIT) Emissions Tier III compliance, EGR systems, SCR catalyst operation NOx reduction limits Tribology Base Number (BN) selection, system oil contamination Cylinder oil feed rate optimization
: Proper procedures for Unattended Machinery Space (UMS) operations during equipment maintenance. This is the catastrophic event
As the pressure wave exits, it creates a vacuum inside the crankcase. This draws fresh, oxygen-rich air back through the relief valves. If the hot spot is still present, this new oxygen triggers a massive, destructive secondary explosion.
offers a searchable database for CES versions like 5.1 and 6.0. Performance Monitoring and Troubleshooting CES 5
: Be prepared for specific set points, such as the 85°C limit for thrust bearing high-temperature shutdowns.
A "hot spot" (such as an overheated crosshead, crankpin bearing, or piston rod gland) vaporizes system oil into a fine mist. When this mist mixes with air in the correct ratio and encounters the hot spot, a primary explosion occurs. This creates a pressure wave that opens crankcase relief valves.
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