Determine oxidation stability of steam turbine oils by rotating pressure vessel
Method B
13. Apparatus
13.1 Method B, Dry Block Bath RPVOT - Dry Oxidation Chamber, Glass Sample Container with PTFE Disk, Catalyst-Coil, Temperature and Pressure Gauge, unit as described in Annex A2. The assembled apparatus is shown schematically and pictorially in Fig. 2, Fig. A2.1, and Fig. A2.2.

14. Reagents and Materials
14.1 Purity of Reagents - Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all reagents conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society where such specifications are available. Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high purity to permit its use without lessening the accuracy of the determination.

14.2 Isopropyl Alcohol, reagent grade. (Warning - Flammable. Health hazard.)

14.3 Varclean Varnish Remover.

14.4 n-Heptane, 99.0 minimum mol % (pure grade). (Warning - Flammable. Health hazard.)

14.5 Oxygen, 99.5 %, with pressure regulation to 620 kPa (90 psi, 6.2 bar). (Warning - Vigorously accelerates combustion.)

14.6 Potassium Hydroxide, Alcohol Solution (1 %) - Dissolve 12 g of potassium hydroxide (KOH) pellets in 1 L of the isopropyl alcohol. (Warning - Flammable. Health hazard.)

14.7 Silicone Carbide Abrasive Cloth, 100-grit with cloth backing.

14.8 Methanol - denatured.

14.9 Wire Catalyst, Electrolytic Copper Wire, 1.63 more or less 1 % mm (0.064 more or less 1 % in.) in diameter (No. 16 Imperial Standard Wire Gauge or No. 14 American Wire Gauge, 99.9 % purity, conforming to Specification B 1. Soft copper wire of an equivalent grade may also be used.

14.10 Cyclo-Hexane, (Warning - Flammable. Health hazard.)

14.11 Reagent Water, conforming to Specification D 1193, Type II.

15. Sampling
15.1 Samples for this test method can come from tanks, drums, small containers, or even operating equipment. Therefore, use the applicable apparatus and techniques described in Practice D 4057.