ASTM D6224 is the practice for in-service monitoring of lubricating oil in auxiliary power-plant equipment. It is the companion to ASTM D4378, which covers the mineral oil in the generating turbine itself. D6224 is a monitoring practice: sampling, test slate, and action levels for the auxiliaries — not a single bench method.
Keep the two practices apart. A boiler-feed pump, fan, or compressor does not inherit the turbine-oil condemn schedule, and the turbine charge does not inherit the auxiliary schedule. D6224 is also not a transformer-oil or DGA document. Alarm limits that are built from plant data rather than copied from a table belong with ASTM D7720.
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ASTM Standard at a Glance
| Property | Value |
| ASTM Standard | ASTM D6224 |
| Type | Practice |
| Covers | In-service lubricating oil for auxiliary power-plant equipment |
| Does not cover | Main turbine oil (D4378); transformer oil / DGA |
| Related software | VeroOCM |
Related software
This practice is cited by VeroOCM.