The line had the following specifications:
|Design Temperature||121 °C|
|Application Temperature||60 °C|
|Design Life||2 years|
|Corrosion Type||Internal/through wall|
|Defect Details||150mm circumferential slot (complete section loss)|
|Geometry||Tee (and wrap over valve body)|
A valve on a crude surge tank had developed a through wall defect in one spot and the surrounding area had minimal wall thickness. The nozzle and valve needed to remain operational, the through wall defect area was sealed using walker technical techno putty before the valve and nozzle were wrapped landing on the tank surface. The temperature requirement of the HT resin required a heat tape to provide an elevated temperature (80oC) cure.
The main challenge for this repair was to ensure the TechnowrapTM design was appropriate for the geometry with limited landing areas around the valve and nozzle arrangement. This meant designing for a 150mm circumferential, through wall defect. Other challenge's included high tank surface temp and multiple vacuum applications to the tank surface.
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