As many of our staff come from owner-operator organizations, they are familiar with the practical details of vessel internals and how they operate. This include high temperature internals in Fluid Catalytic Cracking Units, as well as fixed bed reactors and a wide variety of other equipment. We have experience performing the mechanical design for reactor vessel internals for a major licensor of process technology used in the refining [CBI1] industry. We also have experience with refractory-supported internals. Our sophisticated analyses capabilities combined with expert knowledge on failure mechanisms has enabled us to determine operation at more severe conditions than design, such as higher delta pressure on fixed bed reactor outlet collectors, was acceptable, permitting continued operation of the units.