Abstract
Reformer furnaces are widely used in petrochemical industry to obtain hydrogen from hydrocarbons through an endothermic catalytic reaction. This production takes place in radiant tubes, designed for a nominal life of 100,000h at temperatures up to 980°C and internal pressures of 10-40bar. Their life is primarily limited by creep damage, driven by a combination of high service temperatures and hoop stresses that can evolve into catastrophic failure. Creep life exhaustion is evidenced by progressive diameter deformation and changes in the alloy microstructure. Recently, a nondestructive technique, based on tubes diameter measurements in situ by Laser Optic Tube Inspection System (LOTIS), has appeared very useful to describe quantitatively creep damage and promising to be utilized for residual life evaluations as well.
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