Rust-preventing characteristics of inhibited mineral oil in the presence of water
11. Procedure C for Heavier-Than-Water Fluids
11.1 The stirring action provided by the stirrer prescribed in 5.5 is not sufficient to thoroughly mix the water and test sample when the fluid under test is heavier than water. This section is meant to define changes in the test method to accommodate heavier-than-water fluids. Except as specifically stated, all the requirements of the previous Sections 1-10 shall apply. Since this procedure can be performed with distilled water or synthetic sea water, take care to include this information in the report.
11.2 Apparatus:
11.2.1 Beaker Cover - Same as prescribed in 5.3 (see Note 15).
NOTE 15 - Some heavier-than-water fluids can attack or dissolve PMMA beaker covers and test rod holders. It is recommended that PCTFE beaker covers and PTFE test rod holders be used when testing heavier-than-water fluids.
11.2.2 Stirrer - Same as prescribed in 5.5 but with an auxiliary blade attached to the stirrer shaft. The auxiliary blade shall be of stainless steel, 19.0 by 12.7 by 0.6 mm (0.75 by 0.50 by 0.25 in.) as shown in Fig. 5. The auxiliary blade shall be positioned on the stirrer shaft so that the bottom edge of the auxiliary blade is 57 mm (2.25 in.) above the top edge of the fixed lower blade, and so that the flat surfaces of both blades are in the same vertical plane.
11.3 Test Rod and Its Preparation - Same as prescribed in Section 8.
