ASTM D3603 Rust-Preventing Characteristics of Steam Turbine Oil
ASTM D3603 Standard Test Method for Rust-Preventing Characteristics of Steam Turbine Oil in the Presence of Water (Horizontal Disk Method)
8. Procedure
8.1 Clean the beaker in accordance with good laboratory procedure (Note 8) cleaning solution, wash with distilled water to remove the acid completely, and dry in an oven. Clean the stainless steel stirrer and plastic beaker cover and specimen holder assembly with ASTM precipitation naphtha, isooctane, or 60/80 petroleum spirit, and dry thoroughly at room temperature.
NOTE 8 - In cases of dispute the parties to the dispute to agree on a glassware cleaning procedure. However the round robin was conducted with glassware cleaned with chromic acid.
8.2 Pour 275 mL of the oil to be tested into the beaker and place the beaker in the oil bath held at a temperature that will maintain 60 +/- 1°C (140 +/- 2°F) in the oil sample. Insert the beaker into a hole in the bath cover so that the beaker is suspended with the rim resting on the bath cover. The oil level in the bath shall not be below the oil level in the test beaker. Place the polished specimens in the specimen holder with the vertical specimen beneath the horizontal specimen, and lower the assembly into the oil sample until the cover rests on the beaker rim. Insert the thermometer in the beaker so that the bulb is positioned approximately 20 mm (3/4 in.) from the bottom of the beaker. Place the stirrer in position so that it does not touch the specimens when turning and is within 2.0 mm (0.08 in.) of the bottom of the beaker. Start the stirrer and stir until the temperature of the sample reaches 60 +/- 1°C.
8.3 Continue stirring for 30 min to ensure complete wetting of the steel specimens. With the stirrer in motion, remove the thermometer temporarily and add 25 mL of distilled water by pipet through this hole, discharging the water on the bottom of the beaker. Resume stirring at a speed of 1000 +/- 50 r/min for 6 h from the time the water was added, maintaining the temperature of the oil-water mixture at 60 +/- 1°C (140 +/- 2°F). Stop stirring at the end of the 6-h period, remove the specimens, allow to drain, and then wash with ASTM precipitation naphtha, or isooctane, or 60/80 petroleum spirit. If desired, the specimens may be preserved by lacquering.
