HFRR (High Frequency Reciprocating Rig)
/ Operation

Interpretation Of Results

After the test has completed, remove the upper specimen holder and measure the wear scar on the specimen in the X and Y directions (the dimension across the direction of specimen motion is the X dimension).

Wear Scar Measurement

The average of the two measurements is the mean wear scar diameter. Depending on the test method, a humidity correction factor (WS1.4) may be applied to the mean wear scar diameter to compensate for the effects of fuel moisture content on the test result.

CEC and ISO related test methods

Refer to the reference fuel test limits for wear scar information. For unknown fuel sample refer to relevant standard for wear scar limit (460µm limit).

ASTM test method

Refer to the reference fuel test limits for wear scar information. For unknown fuel sample refer to D975 standard for wear scar limit (520µm limit).

Wear Scar Examples

Some typical wear scar examples are shown below for information purposes. The wear scar measurement is generally taken from the extreme edge of the wear scar boundary, as indicated in the examples. The precise method of measuring the wear scar diameter and the resolution required will be detailed in the relevant specification.

Pictures taken from the HFRR wear scar measurement camera.