Effects of a Surface Engineered Metallic Coating on Elastomeric Valve Stem Seal Leakage Page: 4
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300, manual ball valve. This type of valve is the one of the most commonly used in
TXU's natural gas transmission systems (English 1999). The TXU PlasmaBond coating
process was used to coat O-rings used as the upper valve stem seal. The metallic coating
was applied using personnel, processes, and equipment at TXU's PlasmaBond facility.
A method of reducing valve stem leakage that is easily retrofitted into existing
equipment is an attractive option (Harrison et al. 1995). This research provided data
necessary to determine if use of a metal-coated elastomeric O-ring seal in this type of
valve should be pursued to reduce valve stem leakage.
The purpose of this research was to determine if the application of a metal-coated
O-ring would reduce leakage through an upper O-ring seal of a 2-inch, pressure class
300, manual ball valve. This research also determined if lubrication in conjunction with
the metallic coating would reduce stem leakage.
There were three research questions addressed by this thesis. The first research
question deals with the plasmabond treatment:
1. Will the use of elastomeric O-rings with PlasmaBond metallic coatings reduce stem
This question has a corresponding null hypothesis 1 (Ho)1: there is no change in
leakage due to PlasmaBond treatment. This is represented by equation 1 below where g
is the population average leak rate through the seal.
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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/m1/12/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .