HFRR test procedure

Filtering

1. Beforehand, all equipment that will come in contact with the diesel sample must be rinsed thoroughly with heptane and then air dried
2. Place two 0.8 micron meter Nylon Membrane Filters in the oven at 110 °C for 10 minutes to eliminate unwanted moisture
3. After the 10 minutes weigh them individually and write it down
4. Place both filters on the mesh with the heaviest one on top, as to distinguish between them
5. Fix the long tube to the piece with the mesh with the two bolts
6. Check to see that the filters cover the mesh properly to prevent leaks
7. Fix the tube in both clamps of the stand
8. Measure 500 ml of sample fuel and pour into tube
9. Connect the vacuum pump to the (glass bottle?) and switch the pump on to start filtering
10. When finished, switch the pump off and disconnect it from the (glass bottle?)
11. Pour filtered fuel in storage container
12. Rinse tube with heptane while still assembled and vacuum suck the heptane into another (glass bottle?)
13. Take the long tube and the lower piece apart
14. Place both filters in the oven, still with the heaviest one on top, at 110 °C for 15 minutes to evaporate heptane
15. Weigh filters again and write it down

High Frequency Reciprocating Rig

1. Only use already filtered diesel samples to test on the HFRR
2. Place all specimens that will come into contact with diesel sample in the ultrasonic bath and switch it on for 5minutes
3. Air dry all the specimens the was washed in the heptane
4. Check under microscope that upper ball specimen is turned so that the next test will be done on a surface with no wear scar
5. Turn lower disc specimen to get a clean surface for new test
6. Fasten lower specimen to HFRR machine, with the nipple on the right hand side, with the two small bolts
7. Put 3ml of diesel sample in the lower specimen reservoir
8. Fasten upper specimen to oscillating arm with the remaining one small bolt
9. Attach the sling and the 200g weight to the extended arms of the upper specimen
10. Put silver thermometer in hole next to the nipple
11. Open the HFRR program on the computer
12. Click on 'New Test'
13. Name the file in which the program will save the data from the test
14. Click on 'Start'
15. After the test have finished, click on 'Export test' and save the data in a suitable location on the computer
16. Detach all specimen from the HFRR machine and place in ultrasonic bath for 5minutes
17. Attach the digital camera to the top of the microscope
18. Place the upper ball specimen under the microscope under the yellow IC10 magnification, 100x (maak net seker, ek dink dis 100x)
19. Focus the microscope on the wear scar on the ball and take a picture with the digital camera
20. If the microscope is switched on but the light does not seem to come through, lower the the voltage on the voltage control box of the microscope