By TOM KUCKERTZ
Project Manager for Terminal Operations
Some of the council’s concerns regarding the unknown condition of the crude oil piping at the Valdez Marine Terminal have been answered by inspections performed this summer by Alyeska.
In 2012, a routine inspection by Alyeska personnel of the 20-inch vertical riser pipes that feed crude oil to the loading arms on Berth 4 at the terminal revealed the existence of serious corrosion in some of the girth welds. Girth welds are welds that extend around the diameter of a pipe, typically used to join two sections of pipe.
Following this discovery in 2012, the remaining riser pipes on Berths 4 and 5 were subjected to additional inspections. More occurrences of vertical pipe girth weld corrosion were found and repaired. The cause of the corrosion in that particular region was attributed to water collecting under the pipe’s insulation in combination with a missing anti-corrosion paint coating in the vicinity of the girth weld.