Consider these guides for stress relieving of vertical towers
This case history investigates all required post-weld heat treatment for an existing column
Damage from corrosion
mechanisms often leads to failure in refinery equipment and
creates safety hazards, which interrupt refinery operations. The
corrosion-under-insulation (CUI) phenomenon occurs in insulated
vessels when the vessel shell is in continuous contact with
insulation that has become wet, thus enabling oxidation and
loss of material. During a routine external inspection, the
removal of the insulation around the shell of a process vessel
revealed that the CUI had extended around its entire
circumference (Fig. 1). The remaining thickness in affected
areas of the shell ranged from 0.338 in. to 0.625 in. (being
the original thickness). The tower was assessed for potential
risk of collapse, and an external weld overlay technique was
used as a permanent repair method that restored the corroded
areas to original thickness (Tables 1 and 2).
1. Corroded area (A) and inspection
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