RUST PREVENTING CHARACTERISTICS OF STEAM TURBINE OIL: ASTM D3603
EXPLANATION
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 ASTM D665 (Procedure A), since it gives a separate evaluation of the oil in 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.
TEST SUMMARY
A horizontal steel disk and vertical steel cylinder are immersed in a stirred mixture of 275 mL oil and 25 mL of distilled water at a temperature of 60° C. 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. The test is run for 6 h and the specimens are evaluated.
TEST PRECISION
Since this is a pass-fail test, it is not practical to specify the precision of this test method.
No statement of bias is being made.
