Product Name: Small Diameter and Flanged Columns with Cartridge Trays Model NO.: Cartridge Trays Material: Stainless Steel Surface Treatment: Without Processing Manufacturing Process: CNC Milling Type: Distillation Equipment Trademark: SPT Transport Package: Plywood Box Specification: Tailor made according to customer requirement Origin: China HS Code: 84199090 Product Description The Cartridage Trays For Small Diamter and Flanged ColumnsCartridge trays are a bundle of trays and downcomers helg together on a rod assembly. each bundle is called a cartridge.when column diameters are smaller then about 2.5' to 3 feet. a person cannnot enter the column to install, insepect, and maintain the trays. because of this limitation, a 2.5' to 3 ft column is often installed, even if a smaller diameter is hydraulically sufficent. alternatively, either packings or cartridge trays can be used, and column diameter reduced below 2.5 ft.