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Support grids are devices for catalyst retention in horizontal plane of reactor vessel.

The catalyst is chosen for its efficiency, stability and selectivity. The required volume of catalyst is loaded in beds at a certain level in the reactor vessel. Loaded bed is a set of ceramic balls and catalyst of various types, each of which has its own specific size and density.  The support grid has a prefabricated structure consisting of segments and support beams. The segments are based on triangular wire slit screens. They are installed on a support ring and connected by various fasteners. Cord or ceramic fiber gaskets are used to seal the gaps and ensure tightness. The design features of the grid are determined according to the given loads from the catalyst layer and the pressure drop.

Necessary design parameters

  • Working and design pressure and temperature
  • Flow parameters
  • Physical characteristics of the working environment
  • Pressure drop
  • Catalyst and packing parameters
  • Geometric dimensions of the reactor and the top hatch


  • Dismountable structure allows mounting through the reactor hatch
  • Large screen area, minimal hydraulic resistance
  • Rigid design withstands catalyst weight and pressure drop
  • Clearances are designed to allow thermal expansion
  • The usage of a slit screen stops catalyst leakage and excludes clogging of slots due to the usage of triangular wire
  • Assembly control on a flat surface for checking gaps, flatness tolerances and dimensional deviations
  • Ceramic fiber sealing gaskets and cords are used


  • Hydrotreating
  • Hydrocracking
  • Isomerization
  • Adsorption