A STRUCTURAL INTEGRITY EVALUATION OF THE TANK FARM WASTE TRANSFER SYSTEM Page: 54 of 86
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WSRC-TR-2005-00532 March, 2006
Page 47 of 69
(a)
'41
. . .
APPROX. lx OUTSIDE DPSPF 21987-1
'' '..+, r (b)
4phRrq . 1: tSIDF DrCPF 2197-2
Figure 25. Stainless steel elbow from core pipe between Tanks 6 and 7: (a) exterior
and (b) interior [101].
The observation that stainless steel elbows were attached to carbon steel pipe raises the
issue of galvanic corrosion due to contact between dissimilar metals. Tests performed
recently with carbon steel and stainless steel in contact while being exposed to a high
level waste simulant indicate that significant corrosion is unlikely [102]. As noted in the
material degradation discussion earlier, the erosion resistance of the elbow would be
improved with the use of stainless steel. The visual observations and wall thickness
measurements indicate that minimal wall loss (corrosion and/or erosion) occurred over an
extended time (i.e., 15 years).
5.2.3 Jacket for Transfer Line # 1663 (near Tank 50)
The carbon steel jacket for line #1663, located near Tank 50, was excavated in 2003
[103]. The pipe is 10" diameter Schedule 20 (nominal wall thickness 0.250"). The pipe
had been in service for approximately 20 years and was packed in Gilsulate insulation.
Visual examination revealed corrosion on a 30" segment of the jacket exterior and
showed evidence of broad shallow pitting with isolated areas having deeper pits (see
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Wiersma, B. A STRUCTURAL INTEGRITY EVALUATION OF THE TANK FARM WASTE TRANSFER SYSTEM, report, March 9, 2006; United States. (https://digital.library.unt.edu/ark:/67531/metadc836317/m1/54/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.