Lube Oil & Analysis Flashcards
What would you look for in your lub oil analysis?
- Water content
- Fuel content
- Dirty
- Wear particles
- Base number
- Viscosity
- Acidity
Why do we take oil samples?
Do make sure that equipment is in good condition and there are no deeper issues that we are un aware off
How often?
- Main engines is every 500hrs when we change our oil centrifugal
- Generators are every oil change at 350hrs
- Hydraulics is 6 monthly or annual then again when we change the oil
What are the contaminants of crankcase oil?
- Fuel contamination
- Water contamination
- Wear particles
- TBN
What is TBN?
Total Base Number, this is the amount of additives are left to increase the lubricating properties of the oil for our engine
How much oil should you carry onboard?
Enough to a complete a sump change on one main engine, plus normal day-to-day consumption
Actions upon finding high metal in oil analysis?
Stop that equipment and take another sample.
Do not run until the results are back and if still high then investigate by starting procedure for major overhaul of the equipment
Sources of wear metals and different types?
- Iron - Cylinders, crankshaft
- Chromium - Piston rings
- Molybdenum - Piston rings, Linears
- Copper - Bearings, bushings, oil coolers, thrust washers, copper based grease
- Lead - Bearings
- Tin - Bearings
- Aluminium - Pistion
- Nickel - Valve train, Turbo
- Silicon - Dirt/ Dust
- Abrasive wear
- Fatigue wear
- Corrosion wear
Type of contaminates, biological and testing?
Physical contaminates - Dust, Dirt, Wear, Water
Chemical contamination - Fuel, Coolant
Biological contaminants - Bacteria
Testing physical - Particle count analysis
- Crackle test for water
Chemical test - TAN/ TBN
Biological testing - visual, smell, microscopy
High copper in lab analysis, causes?
- Bearings,
- Bushings,
- Oil coolers,
- Thrust washers,
- Copper based grease
