ASTM D6079 Standard Test Method for Evaluating Lubricity of Diesel Fuels by the High-Frequency Reciprocating Rig (HFRR)
8. Sampling and Sample Containers
8.1 Unless otherwise specified, samples shall be taken by the procedure described in Practice D4057 or Practice D4177.
8.2 Because of the sensitivity of lubricity measurements to trace materials, sample containers shall be only fully epoxy-lined metal, amber borosilicate glass, or polytetrafluorethylene (PTFE), cleaned and rinsed thoroughly at least three times with the product to be sampled before use, as specified under Containers for Lubricity Testing in Practice D4306.
8.3 New sample containers are preferred, but if not available, the Containers for Lubricity Testing section of Practice D4306 gives guidance on suitable cleaning procedures for each type of container.
9. Preparation of Apparatus
9.1 Test Disks, (as received):
9.1.1 Upon receipt, new discs must be stored under toluene for at least 12 h before cleaning, as described in 9.1.2 through 9.1.5.
9.1.2 Remove disks from toluene and place discs in a clean beaker. Transfer a sufficient volume of toluene into the beaker to completely cover the test disks.
9.1.3 Place beaker in ultrasonic cleaner and turn on for 7 min.
9.1.4 Handle all clean test pieces with clean forceps. Remove the test discs and repeat the above cleaning procedure from 9.1.2 with acetone for 2 min.
9.1.5 Dry and store in desiccator.
NOTE 2 - Drying operations can be accomplished using compressed air jet at 140 to 210 kPa-pressure.
9.2 Test Balls, (as received) - The test balls are to be cleaned following the same procedure, 9.1.1 to 9.1.5, as for the test disks.
9.3 Hardware - All hardware and utensils that come into contact with the test disks, test balls, or test fuel, shall be cleaned by washing thoroughly with toluene, dried, and rinsed with acetone. Dry and store in a desiccator.
10. Test Apparatus Inspection and Verification
10.1 Temperature - Check the temperature control of the test reservoir using a calibrated temperature measuring device.
10.2 Frequency - Check the frequency of the vibrator unit with a calibrated frequency meter.
10.3 Stroke Length - Check the stroke length by measuring the wear scar on the test disk, using a calibrated microscope, after running a test on reference Fluid B. Subtract the width of the wear scar from the length of the wear scar to give the actual stroke length.
10.4 Run Time - Check the run time with a calibrated stopwatch (optional).
10.5 Test Apparatus - Verify test apparatus performance and accuracy at least every 20 tests by testing each reference fluid in accordance with this section. Perform two tests with each reference fluid at the test temperature to which the test apparatus is being verified. If the difference between the two wear scar diameters (WSDs) for either fluid is greater than 0.08 mm, then further tests or corrective action to verify the test apparatus performance and accuracy will be required. Further tests or corrective action to verify the test apparatus performance and accuracy is also required if the average of the two tests differs by more than 0.08 mm from the average WSD values provided with Fluid A and Fluid B at 25°C and 60°C.
