ASTM D7098 Standard Test Method for Oxidation Stability of Lubricants by Thin-Film Oxygen Uptake (TFOUT) Catalyst B
9. Preparation of Apparatus
9.1 Glass Sample Container - A clean glass sample container is important for obtaining repeatable results. Thorough cleaning can be accomplished by (a) rinsing with cyclo-hexane or other suitable hydrocarbon solvent, (b) soaking in concentrated solution of a water-soluble varnish remover, (c) thoroughly rinsing with water, (d) rinsing with acetone, (e) and permitting to dry.
NOTE 5 - A segmented glass reaction dish has been found suitable to prevent premature mixing of the catalyst components (see Fig. A2.4)
9.2 Cleaning of Pressure Vessel - Fill with concentrated solution of a water-soluble varnish remover and soak for suitable time, rinse with water, rinse with acetone, and permit to dry.
9.3 Cleaning of Pressure Vessel Stem - Periodically disassemble, inspect, and clean the pressure vessel stem. Rinse the inside ofthe stem with isopropyl alcohol and blow dry with oil free compressed air. For users of apparatus described in Annex A1, periodically insert a dry pipe cleaner into the transducer line opening for removal of potential residue buildup.
NOTE 6 - Replace O-rings when reassembling the pressure transducers.
9.4 Periodically pressure test the pressure vessels at 690 kPa (~100 psi) with air or oxygen. If the pressure drops more than 0.690 kPa (~0.1 psi) on the pressure gauge within 60 s, replace the O-ring seals and inspect the valve seals according to manufacturer's directions. If the problem continues, contact the specific equipment manufacturer.
NOTE 7 - Previous versions of this test method have called for hydrostatic testing of the pressure vessel. This was found unnecessary at the relatively low pressures involved in running this test method.
9.5 Cleaning of Catalyst Syringes - Use individual catalyst syringes for each catalyst component. Thoroughly clean and dry syringes prior to each use. (See Annex A5 for recommended procedure.)
