What are the causes of a sudden drop and a gradual drop in lubricating oil pressure?
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Reasons for a sudden drop: 1. Mechanical failure of the pump; 2. Low oil level in the tank; 3. Faulty control valve; 4. Safety valve tripped and not reset; 5. Oil filter suddenly clogged with a large amount of impurities; 6. Leak in the oil cooler. Reasons for a gradual drop: Usually it’s due to issues with the quality of the oil, with the pressure difference across the oil filter increasing over time. Personal opinion
This post was last edited by Chemical Gas Purification on 2010-12-30 at 11:28. What was said above is quite correct and comprehensive; these are the main reasons, and one should pay attention to making judgments when operating.
1. Oil pump failure 2. Leakage； 3. Oil temperature too low ； 4. The oil filter is clogged ； 5. Internal leakage in the oil cooler ； 6. Failure of the instrument oil pressure control valve ； 7. The return valve is opened too wide.
In addition to those mentioned above, other reasons for low lubricating oil pressure in the oil system of ammonia compression refrigeration include: 1. The inlet filter of the oil pump is clogged. 2. It is caused by problems with the self-acting control valves for the oil and lubricating oil pressures at the oil pump outlet. 3. If the oil temperature is too high, its viscosity decreases and the oil pressure drops.
The outlet check valves of the standby lubricating oil pump and the emergency lubricating oil pump become loose due to vibration, which prevents the backflow of lubricating oil from being stopped; as a result, the amount of lubricating oil leaking increases, leading to a gradual drop in lubricating oil pressure.
Additional note:) A failure of the hydraulic pressure sensor can also cause the gauge to show a sudden drop in oil pressure
High oil temperature, oil pump cavitation, oil pipeline leakage, or bypass flow
Sudden drop: 1. Pump mechanical failure; 2. Low oil level in the oil station; 3. Faulty control valve; 4. Safety valve activated and not reset; 5. Leakage in the oil cooler; 6. Leaks at pipe flanges or valves, etc.; 7. False readings from instruments. Reason for the gradual decrease: rising oil temperature. 2. The pressure difference of the oil filter increases.