Effects of a Surface Engineered Metallic Coating on Elastomeric Valve Stem Seal Leakage Page: 32
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damage to equipment associated with galling of metal components. This process was
first used at TXU's fossil plants. Recent developments have centered on uses at TXU's
nuclear power plant. Because of the sensitivity associated with new technology at a
nuclear power plant, the following testing was used to justify the use of PlasmaBond at
TXU's Comanche Peak Steam Electric Station nuclear power plant.
TXU tested 3/4 inch diameter carbon steel bolts that were exposed to 6250 F for
one month. Testing demonstrated that the treated surfaces resisted galling. TXU also
conducted extensive testing on treated 7-inch diameter reactor vessel closure studs.
Testing indicated that there was no significant wear with unlubricated studs after repeated
removal cycles. In addition, there was no indication of galling. Subsequently, all of the
reactor vessel studs (54 in each of the two vessels) have been treated and no galling has
been detected. TXU had previously experience problems with reactor vessel studs
binding and galling. TXU evaluated PlasmaBond treated carbon steel fasteners
repeatedly torqued to maximum service levels used in a typical pipe flange joint. There
was no indication of galling after at least three assembly cycles (Harrington and Kidd
Stuffing Box Treatment
Angelo (Angelo 1994) performed laboratory tests of sulfur cured nitrile stuffing
box material used in oil field equipment. The testing involved pressurizing an inverted
cone stuffing box seal with nitrogen. A polished rod was continuously reciprocated at a
rate of 20 strokes a minute through the seal. Leakage measurements were performed by
capturing the nitrogen in a water trap and measuring the displacement of water in a
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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/m1/40/: accessed March 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .