ASTM D3705 Test Method for Misting Properties of Lubricating Fluids
8. Procedure
8.1 Break-In Period:
8.1.1 Charge the mist generator with 4 ± 0.1 L of test oil. Assemble the test apparatus.
8.1.2 Turn the oil flow adjusting screw clockwise to a fully closed position and then open the screw by turning it counterclockwise to a full open position.
8.1.3 Open the air regulator until a pressure of 37 millibars (37 KPa) is obtained on the manifold gage.
8.1.4 Activate the oil heater and inlet air heater and adjust both to 40 ± 1°C.
8.1.5 Allow the unit to run for 1 h to stabilize.
NOTE 4 - The full open position for the oil flow adjusting screw, that is, the position beyond which further opening of the adjusting screw does not increase oil output from the mist generator, should be determined for each mist test unit. The full open position on most test units is attained by turning the adjusting screw counterclockwise 2-1/2 turns from the fully closed position.
8.2 Test Start-Up:
8.2.1 Following the 1-h break-in, deactivate the air and oil heaters and turn off the air supply.
8.2.2 Disconnect and weigh the mist generator (W1) and install clean, tared line condensate bottles (LC1) and reclassified oil collector (RC1).
8.2.3 Reassemble the apparatus. Turn on the inlet air and activate the air and oil heaters to start the test.
8.2.4 Record the air flow rate in dm3/s.
8.2.5 Check the inlet air temperature, oil reservoir temperature and manifold temperature. Make adjustments, if necessary, 30 min after starting the test to bring the manifold pressure to 37 ± 1 millibars, (3.7 ± 0.1 KPa) and the inlet air temperature to 40°C.
8.2.6 At the end of the 19-h test, deactivate the heaters and turn off the air supply. Disconnect and weigh the mist generator (W2), line condensate bottles (LC2), and reclassified oil collector (RC2) within 15 min.
