High temperature operations of flares often give the serious problems to its crown tube.
Especially the materials used are stainless steel. The locations of disposal gas combustion at the
crown become the primary aspect of flare operation. The macro structure of failed crown tube was
found to have the fissure on its edge, which has the variation of appearances. The chance of materials
to react with high temperature combustion contributes to the differences of tube crown color that
failed. The former and the later appearances indicated the mode of failure. This paper observes the
locations effect of disposal gas combustion to the failure of crown tube color and fissure mode. Visual
examination was implemented to figure out the effect of the environment to the crown tube. SEM
data also should be considered to convince the phases that came out from the interaction between
crown tube and high temperature combustion. The difference of temper color of failure crown was
found on the inner and outer surface. Unevenly heat source from the inner surface caused the ignition
force from the inner surface of crown tube that led the initial deformation for the crown.