Lube Oil TAN / Water - Condition Check
Condition monitoring pass/fail for Total Acid Number (TAN) and water content against typical marine system-oil limits.
Assessment
In-service
Formula, assumptions, and limits
Limits apply to 2-stroke system oil / 4-stroke crankcase oil. Water + TAN together indicate cylinder-cooling leak (high water) or overheated combustion (high TAN).
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Total Acid Number | mg KOH/g | ASTM D664 | |
| Free + emulsified water | % v/v | ISO 3733 / Karl-Fischer |