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)
5. Apparatus
5.1 Oil Bath - A thermostatically controlled liquid bath capable of maintaining a temperature in the oil sample of 60 +/- 1°C (140 +/- 2°F). The bath shall have a cover with holes to accommodate the test beakers.
NOTE 1 - The bath used for Test Method D665 may be used with slight modification, that is, the centers of the beaker holes are moved from 6.4 mm to 18.3 mm (1/4 to 23/32 in.) from the axes of the stirrers.
NOTE 2 - To indicate the temperature, a thermometer conforming to the requirements of ASTM Thermometer 9C or 9F, or IP Thermometer 21C, as prescribed in Specification E 1 should be used.
5.2 Beaker - A 400-mL, Berzelius-type, tall-form heat-resistant glass beaker without pourout, as shown in Fig. 1, approximately 127 mm (5 in.) in height measured from the inside bottom center and approximately 70 mm (2 3/4 in.) in inside diameter measured at the middle.
5.3 Beaker Cover and Specimen Holder - A flat beaker cover (Fig. 2) of methyl methacrylate resin or other fluid resistant material is kept in position by a suitable groove. Three holes are provided. Two are located on any diameter of the cover, one for a stirrer, and the other for attachment of a disk specimen to the underside of the cover for optional vapor phase testing. The third hole is for a thermometer, located on a diameter perpendicular to that of the other two holes. The outside of the polytetrafluoroethylene (PTFE) specimen holder (Fig. 3) is a square, but from the ends of one diagonal, two equal pieces of PTFE are cut off over the height of the holder. Two vertical threaded holes are made on the other diagonal of the square. The inside of the holder consists of two cylindrical holes, one on top of the other. Four horizontal holes are drilled 90° apart on the circumference where the two cylindrical holes meet. The PTFE specimen holder is connected to the beaker cover by two stainless steel holding rods (Fig. 4). Both ends of each holding rod are threaded. The surfaces between the threads are polished with No. 180 grit emery. The 12.7-mm threaded ends of the holding rods are screwed into the two vertical threaded holes of the specimen holder. The 19.0-mm threaded ends of the holding rods are connected to the beaker cover by putting them through two holes on a line perpendicular to the connection line of the centers of the earlier mentioned first and second hole of the beaker cover. Each holding rod is fastened by two 10-32 stainless steel nuts.
NOTE 3 - An alternative design for the specimen holder assembly has also been used successfully. See Test Method D3603–82.
5.4 Stirrer - A stirrer constructed entirely from stainless steel in the form of an inverted T (Fig. 5 ). A flat blade 25.4 by 6.1 by 0.6 mm (1 by 0.24 by 0.024 in.) shall be attached to a 6.1-mm (0.24-in.) rod in such a way that the blade is symmetrical with the rod and has its flat surface in the vertical plane.
NOTE 4 - A suitable material is an 18 % chromium, 8 % nickel alloy steel conforming to Type 304 of ASTM Specification A 240 or SAE No. 30304, or BS 970: Part I:1983:302531.
NOTE 5 - If stainless steel is not obtainable, stirrers made of heat-resistant glass10 and having approximately the same dimensions as the stainless steel stirrers may be used.
5.5 Stirring Apparatus - Any convenient form of stirring apparatus capable of maintaining a speed of 1000 +/- 50 r/min.
5.6 Grinding and Polishing Equipment - A 150 and 240-grit metalworking aluminum oxide abrasive cloth, closed coat on a jeans backing, a suitable chuck (Fig. 6 ) for holding the specimen, and a means of rotating the specimen at a speed of 1700 to 1800 r/min.
6. Reagents and Materials
6.1 Cleaning Agents - One of the following shall be used:
6.1.1 ASTM Precipitation Naphtha, conforming to Test Method D91. (Warning - Flammable. Health hazard.).
6.1.2 Isooctane, conforming to Annex II on Reference Materials and Blending Accessories (see 2.2). Previously used, unrusted specimens shall be stored in this reagent. (Warning - Flammable. Health hazard.).
6.1.3 IP Petroleum Spirit, conforming to IP Specification 60/80. (Warning - Flammable. Health hazard.).
