Internals for Down Flow Reactors.pdf - Johnson Screens

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6 SUPPORT gRIDS Johnson support grids can be fitted with manways lifting lugs, thermowell guide and catalyst pump tubes Johnson Screens leads the way in applying innovative technology to industrial screen problems. No matter what obstacles are present in the vessel, we can manufacture grids that accommodate many design features such as dump-tubes, thermowells, thermocouples and other special requirements. Our grids can be made into a variety of shapes including pie-shaped panels and chordal sections. To provide access to the underside of the grid, a removable manway can be installed. Our designs vary to accommodate different load, temperature and special configurations. To deal with extreme loads often encountered in media retention systems, we typically recommend side-by-side (SBS) construction (left). In horizontal vessels, the screen is placed below the center line and extends the full length of the vessel. Depending on vessel size, the screen may span the entire distance or rest on one or more support beams. As with circular grids for vertical vessels, the screen is often made in flanged sections to facilitate installation. In this design, large rectangular bars are welded to the screen support rods, creating a very strong structure. For lighter loads, single rod (SR) construction may be used. We can also design grids with larger, heavier flanges, which allows the grid to span greater distances, minimising the need for a support structure. Dehydrator systems with cyclic pressure and temperature impose difficult constraints on grid design. Working together, we can define the correct vessel support ring size, grid metallurgy and perimeter seal to achieve troublefree operation. in retrofitting fixed bed systems, damaged wire mesh is removed, leaving still-serviceable support grating in place. Our screens are then installed over the grating, creating a very strong, efficient and long-lasting system
distributor trays Our gas/liquid distributor trays/mixing chambers are key components in the primary refinery applications of hydrocracking, hydrotreating and hydrodesulphurisation. High performance trays and mixing chambers provide excellent mixing of incoming gas and liquid flows. Ensuring an even distribution over the entire reactor cross section results in a uniform flow pattern and optimum catalyst performance. made from an assembly of bolted plates and distributor nozzles/chimneys, our trays also include support beams, manways, gaskets and all the hardware required for installation and testing. Pre-assembly of the complete package is offered in order to make sure that all parts match together. tightness of all joints is defined in the factory, thus avoiding by-pass and maldistribution of the flow in the catalyst bed upon final assembly in the vessel. 7
Page 1 and 2: INTERNALS FOR AXIAL FLOW REACTORS
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Internals for Down Flow Reactors.pdf - Johnson Screens

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