Effects of a Surface Engineered Metallic Coating on Elastomeric Valve Stem Seal Leakage Page: 65
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RESULTS AND ANALYSIS
Leak testing was conducted at TXU's Procurement Overview test facility. This
facility was used exclusively for this research during the test periods. The results of the
testing were recorded manually and later entered into a Microsoft Excel spreadsheet.
Test of the objective criterion, using the equations discussed in chapter 3, was the
primary method employed to analyze the test data. Interaction between the two factors
was also analyzed by plotting the leakage for each combination of the factors.
Additionally, several observations in the area of the test sequence, leak location, and
visual appearance of the valve parts were included as part of the analysis.
Tests of Objective Criteria
Tables 3, 4, and 5 are based on Hadamard matrices (appendix A) and show the
results of the testing compared to the objective criteria. Each of these tables contains the
average standard deviation, test criterion, and the difference in means between treated
and untreated samples for each cycle plateau.
Table 3 corresponds to research question 1: Will the use of elastomeric O-rings
with PlasmaBond metallic coatings reduce stem leakage? The objective criteria were
computed using equation 15. Table 3 shows that, except for the 50 cycle plateau, the
testing resulted in a failure to reject the null hypothesis.
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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/m1/73/: accessed July 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .