Abrasion Testing of Critical Components of Hydrokinetic Devices Page: 4 of 21
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ORPC Alaska, LLC
DE-EE0003631: Abrasion Testing of Critical Components of Hydrokinetic Devices
December 6, 2013 ORPC
2. Determine the impact that sediment may have on bearings and seals
Sixty-hour flume tests with high suspended sediment water were conducted following sixty-
hour tests with clear water on four bearing types (Vesconite, CIP, Feroform T814, and PCD)
with both single- and double-cartridge Chesterton seals. Measurements of wear on
individual bearings were made for all four bearing types.
The various bearing types exhibited differing wear amounts that were measureable in
both clear water and high suspended sediment water tests, allowing the different bearing
types to be compared with one another for suitability for this application. Seal failures
were also observed during testing in both single and double cartridge seals, highlighting
the importance of the relationship between bearing wear and its impact on seal
performance. The high suspended sediment water did not however show significantly
higher wear on the bearings than the clear water.
3. Determine the wear rate of bearings and seals
Measurements of wear on individual bearings were made for all four bearing types with
both clear and sedimented water and plotted to compare the rate of degradation of
bearings. Damage to seals during testing was also noted.
4. Identify which configurations best resist degradation from suspended sediment abrasion
The PCD bearings were observed to resist abrasion better than the three polymer bearing
types in both the clear and sedimented water tests. The PCD bearing also had a lower
Coefficient of Friction making it a more efficient bearing choice as well. The three
polymer bearings showed varying wear rates with the Feroform T814 and CIP bearings
outperforming the Vesconite bearings in terms of wear.
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Worthington, Monty; Ali, Muhammad & Ravens, Tom. Abrasion Testing of Critical Components of Hydrokinetic Devices, report, December 6, 2013; United States. (digital.library.unt.edu/ark:/67531/metadc871162/m1/4/: accessed February 17, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.