【Daily Question No. 307】November 09, 2018
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【Daily Question No. 307】November 09, 2018: Briefly describe the main reasons for a drop in the lubricating oil pressure of a turbine (1) Control valve failure ； (2) Cooler leakage ； (3) Low fuel tank level ； (4) Pump failure resulting in no flow ； (5) Filter clogged. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Correct: 3 wealth, Incorrect: 1 wealth ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately. For management purposes, if you need to view content from a few days ago, please go to https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=space through the summary post below
(1) Control valve failure； (2) Cooler leakage ； (3) Low fuel tank level ； (4) Pump failure resulting in no flow ； (5) Filter clogged.
The filter is dirty or clogged; the pressure control valve of the oil system has been opened wider due to vibration or human error, resulting in a drop in oil pressure
1. Oil issues: The incorrect oil grade is being used, or the viscosity is too low; the oil level in the oil pan is too low, meaning there isn’t enough oil. 2. Clogging problems: Clogs occur due to the failure to replace the oil and filter over time, or because the lubrication system hasn’t been properly cleaned and maintained, which results in insufficient oil supply and low oil pressure. Common locations where blockages occur include the oil filter, oil cooler, oil pump, oil suction screen, oil suction tray, oil suction pipe, and strainer. III. Oil pump and pressure regulator failures: Wear of the oil pump leads to excessive gaps or air leakage in the pump body; the pressure regulating valve becomes stuck or the pressure regulating spring is damaged, etc. 4. Internal leakage in the lubrication system and seal failure: This condition often occurs in areas such as cracks in the oil pipes from the oil pump outlet to the engine’s oil passages, or leaks at the connection flanges; it can also be caused by internal pipeline leaks and excessive bearing clearances. 5. Diesel or water entering the oil pan causes the engine oil to be diluted, resulting in too low viscosity:
1. Oil issues: The incorrect oil grade is being used, or the viscosity is too low; the oil level in the oil pan is too low, meaning there isn’t enough oil. 2. Clogging problems: Clogs occur due to the failure to replace the oil and filter over time, or because the lubrication system hasn’t been properly cleaned and maintained, which results in insufficient oil supply and low oil pressure. Common locations where blockages occur include the oil filter, oil cooler, oil pump, oil suction screen, oil suction tray, oil suction pipe, and strainer. III. Oil pump and pressure regulator failures: Wear of the oil pump leads to excessive gaps or air leakage in the pump body; the pressure regulating valve becomes stuck or the pressure regulating spring is damaged, etc. 4. Internal leakage in the lubrication system and seal failure: This condition often occurs in areas such as cracks in the oil pipes from the oil pump outlet to the engine’s oil passages, or leaks at the connection flanges; it can also be caused by internal pipeline leaks and excessive bearing clearances. 5. Diesel or water entering the oil pan causes the engine oil to be diluted, resulting in too low viscosity:
(1) Control valve failure； (2) Cooler leakage ； (3) Low fuel tank level ； (4) Pump failure resulting in no flow ； (5) Filter clogged.
1. Excessively high oil temperature 2. Too many oil leakage points 3. Clogged filter 4. Leakage in the lubricating oil pump
(1) Control valve failure； (2) Cooler leakage ； (3) Low fuel tank level ； (4) Pump failure resulting in no flow ； (5) Filter clogged.
(1) Control valve failure； (2) Cooler leakage ； (3) Low fuel tank level ； (4) Pump failure resulting in no flow ； (5) Filter clogged.
Main phenomena: 1. When the lubricating oil pressure drops to 10 PSIG, an audible and visual alarm for low lubricating oil pressure is triggered. 2. When the lubricating oil pressure drops to 103 PSIG, the pressure relay automatically activates the standby AC oil pump. 3. When the lubricating oil pressure drops to 90 PSIG, the pressure relay automatically activates the standby DC emergency oil pump. 4. When the lubricating oil pressure drops to 6PSIG, the pressure relay automatically shuts down the turbine and stops the crankshaft rotation. 5. The lubricating oil pressure gauge indicates a drop. 6. The bearing temperature and return oil temperature are on the rise. Main reason: 1. Fault in the operating oil pump. 2. The oil system pipes have ruptured, causing severe oil leakage. 3. Failure of the lubricating oil pressure regulating valve. 4. The accidental opening of the oil system relief valve led to excessive oil leakage. 5. Cool oil cooler leakage.
(1) Control valve failure； (2) Cooler leakage ； (3) Low fuel tank level ； (4) Pump failure resulting in no flow ； (5) Filter clogging