If a single cylinder relief valve on a main propulsion diesel engine begins to lift, but it is not possible to secure the engine, which of the following actions should be taken?
• Function and purpose of a cylinder relief (safety) valve on a diesel engine • What it means when a relief valve begins to lift during operation • Safe immediate action when you suspect overpressure or overload in a single cylinder
• Ask yourself: if pressure in one cylinder is high enough to lift the relief valve, what is the most direct way to reduce that pressure? • Which choices could increase risk or mask the problem instead of relieving it? • Which options involve re-adjusting set points or timing while the engine is running under abnormal conditions—are those safe as an immediate response?
• Identify which option directly reduces heat/pressure generation in the affected cylinder. • Eliminate any option that tries to defeat or alter the safety device while it is indicating an unsafe condition. • Be cautious of actions that involve major mechanical adjustments under load, rather than a quick, controllable change to that one cylinder.
No comments yet
Be the first to share your thoughts!