Effects of a Surface Engineered Metallic Coating on Elastomeric Valve Stem Seal Leakage Page: 71
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extraneous variables. It was noted during the testing that the leakage appeared to
increase as the testing progressed. Figure 24 shows the average leak rate, including all of
the cycle plateaus, for each test sequence.
* * *
2 4 6
2 4 6
Figure 29. Plot of average leakage for each test sequence.
Leak Location Observations
A leak was usually detected initially using the GOW MAC 21-250 instrument.
The Ion Science detector would then be placed at that location and the leak rate
measured. Both the instruments used have an audio feature, which varies as the leak rate
varies. Based on the sound, it was determined when the leak rate had reached its peak at
a location. The leak rate at a location would increase over a period of time and then
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Taylor, John Abner. Effects of a Surface Engineered Metallic Coating on Elastomeric Valve Stem Seal Leakage, thesis, December 2000; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc2690/m1/79/: accessed March 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .