An owner-operator wants to increase the maximum permissible load limits for the internal components of a reactor in order to extend operational run times. Reactor fouling results in buildup of organic solids, coke, or other biproducts on the catalyst bed.  The fouling material restricts flow and subsequently increases the pressure delta across the catalyst bed or outlet collector.  If the increased load approaches the load limit for the internal components, equipment and unit shutdown may become necessary.

Employ ASME Section VIII, Division 2 methodologies to maximize the permissible load limits for the internal components. The internal components may include intermediate bed support beams, rings, grids, screens, or the outlet collector (i.e., elephant stool).  API 579-1/ASME FFS-1 (API 579) technology may also be used to supplement ASME VIII-2.