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)
3. Summary of Test Method
3.1 The test method involves completely immersing a horizontal steel disk and vertical steel cylinder in a stirred mixture of 275 mL of the oil under test and 25 mL of distilled water (water conforming to Specification D1193, Type II) at a temperature at 60°C (140°F).
3.2 The horizontal specimen allows water to puddle on the surface, and the vertical specimen is continually washed with the oil-water mixture during the test.
3.3 The test is run for 6 h and the specimens are evaluated.
4. Significance and Use
4.1 Horizontal metal surfaces, on which water droplets tend to be retained, are more prone to rusting and corrosion than vertical or sloping surfaces. This test method is therefore more discriminating than Test Method D665 (Procedure A), since it gives a separate evaluation of the oil on a horizontal and a vertical surface. The test method indicates the ability of oils to prevent rusting and corrosion of all ferrous surfaces in steam turbines under full flow and quasi-static conditions. It is used for specification of new oils.
