Creep strain within
steam/methane reforming and pyrolysis heaters typically developes in the form
of bulging or swelling. Laser
profilometry has been successfully applied to inspect spun-cast high alloy
tubes. The technique can measure the diametrical
dimensions of the tubes from either the tube interior (if the catalyst is
removed) or the tube exterior The laser profilometry method enables modeling
the tube in a color 3-dimensional format, revealing both localized or general
areas of concentrated creep strain. Data
is presented in a quantitative format which can then be applied to generate
tube remaining life assessments on the full tube length, or within localized
regions. By combining the produced
images of each individual tube, overall damage patterns within the heater can
be identified.
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