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Tower Trays

Trays are commonly used for oil refineries and applications where pressure drops are not critical. Conventionally columns operating under high or moderate pressures can be designed for trays for distillation purpose. Tray columns can also be designed to operate under atmospheric or partial vacuum or complete vacuum conditions.

Trays are used in mass transfer operations where pressure drop limitations are not critical. They are mainly used in high pressure distillation operations. However, there are a few atmospheric, moderate pressure and vacuum operations where trayed towers are used. Trays are available in segmental or cartridge type construction to suit customer's requirements. Trays range from sieve and valve trays to bubble cap and cartridge trays. Valve trays are typically with covers provided to the perforations of the sieve trays. Valves are either movable (conventional) or fixed. Valves provide extra resistance to the rising vapour, which are discharged laterally. This helps better interactions with the liquid on the tray and increases efficiency.

Valve Trays

Valve Trays have caps over the perforation on the trays. These caps are either fixed or floating. Fixed valves are set at a defined height and remain in open condition. The floating valves are either circular or rectangular and move up and down based on the vapour pressure. Floating valve trays are more efficient than fixed valve trays.

Sieve Tray

Sieve Trays consists of flat perforated deck. Passage for the vapours is through holes provided. The vapour pressure is such that it prevents liquid into the perforation. These trays have good capacity and moderate efficiency. Sieve Trays have low maintenance cost.

Bubble Cap Tray

These trays consist of deck with fitted risers on which, inverted caps are fixed keeping a gap for vapour passage. This results in greater pressure drop. Bubble Cap Trays are used for low liquid loads & very high turn down ratios.

Cartridge Tray

Towers with small diameters, prohibiting installations of trays though man holes require Cartridge Trays to be installed. These trays are connected together to form bundles for easy installation. These can be sieve trays, valve trays or bubble cap trays as per system requirements.