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could help to determine how mineral oil-based greases compare with bio-based greases at various temperatures; and the results indicated that both grease types changed values as temperatures dropped and bio-based winter greases showed to maintain their consistency the same as mineral oil-based greases.
Figure 4. The test grease dispensors bars and collection methods for the pumped grease.
1.2.2 Results
The following charts present the amount grease pumped by each lubricator with fixed settings at different temperatures; and the un-worked penetrometer of each grease after it was tested and were acclimated to the test temperature.
Figures 5 presents and example of a chart that shows the amount of grease dispensed and the penetrometer values at various test temperaures. In Figure 5, the winter version of this bio-based grease, was pumped about equalty by both dispensers. It should be noted that, the grease dispensor from OEM 2 is considered a high pressure system. The high pressure of the pumping system seemed to improve pumping performance at colder temperaures. A complete set of charts for all test grease can be found on-line in the full report.
The grease dispensing tests indicated that each lubricator has some advantages over the other one at different temperatures. The operator’s comment was that if some of the features of the two dispensers could be combined, a more optimum dispensing system could be made available to the users. The differences were due to the type of pump and valving used in each lubricator/dispenser. While one would pump better at colder temperature in terms of pumping the desired volume, the other provided more uniform output at higher temperatures. But, at the extreme temperatures both lubricators dispensed similar amount of grease based on the test settings. The general purpose of this test was to determine how bio-based greases and mineral oil-based greases pump through the hoses and dispensing bars and how the grease slumps in the reservoir. In this process, the performance of the OEM equipment was also observed. Based on the results reported here, the test bio-based greases performed the same, and in some cases better than the mineral oil-based grease at the extreme colder temperatures. This is important since the cold temperature performance of bio-based (especially vegetable oil based) greases has been in question. The results of performance at extreme temperatures in the environmental chamber when compared with the results obtained through laboratory testing in grease mobility test and in Lincoln Ventmeter should provide a better insight into the performance of the current bio-based greases.
LINKS
www.elmusa.com
www.fra.dot.gov/Elib/Document/3936
*NOTICE 1
This document is disseminated under the sponsorship of the Department of Transportation in the interest of information exchange. The United States Government assumes no liability for its contents or use thereof. Any opinions, findings and conclusions, or recommendations expressed in this material do not necessarily reflect the views or policies of the United States Government, nor does mention of trade names, commercial products, or organizations imply endorsement by the United States Government. The United States Government assumes no liability for the content or use of the material contained in this document.
*NOTICE 2
Figure 5. An example of charts showing the amount of grease dispensed through each lubricator at various test temperatures (top) and pentrometer values (bottom)
The environmental chamber tests provided an opportunity to test the performance of the dispensing equipment as well as the pumpability of the tests grease at different temperatures. In order to ensure that bio-based greases are exposed to colder temperatures for extended periods of time the entire grease and dispensing equipment was allowed a minimum of 24 hours exposure to the test temperatures before performing the tests. Additionally, the test greases were placed in standard cups that are used for test of consistency and were tested for penetration values at various test temperatures. The results
The United States Government does not endorse products or manufacturers. Trade or manufacturers’ names appear herein solely because they are considered essential to the objective of
this report.
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LUBE MAGAZINE NO.130 DECEMBER 2015
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