Lab Services

Automated Total Acid Number (TAN) Operations (ASTM D-974)

The total acid number (TAN) is the number expressed in milligrams (mg) of potassium hydroxide needed to neutralize the acid in one gram of oil. The test is used to indicate the amount of oxidation that the fluid has undergone. The TAN increases as the fluid undergoes increased amounts of oxidation.

Importance of the TAN Test

The TAN is used to condemn nearly all-fluid types, thus a precise and accurate analysis is crucial. The TAN signifies the basic condition of the fluid by giving a value that signifies the amount of oxidation that the fluid has undergone. The TAN also can help to determine if a compressor is running too hot, or if the compressor is ingesting a foreign chemical that is harmful to the lubricant and or the compressor.

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