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Dual Flow Tray
These trays are typically used in smaller diameter towers due to the difficulty in achieving the required levelness tolerances. Dualflow trays are normally perforated with large diameter holes on a uniform pattern across the full cross section of the tower. They are supported by 360 degree tray support rings, since downcomers are not required. The perforations in the tray provide the dual purpose of vapor and liquid exchange. In a normal operating mode, liquid moves and splashes on top of the tray in a wavelike manner. Liquid will periodically flow through the perforations under the areas of liquid peaks while vapor rises through holes in the valleys or liquid low points.

The dualflow tray depicted below is of typical design without special features.

Fractionation trays are fabricated from a wide variety of materials. When corrosion is expected to be extremely low and design temperatures are not excessive, carbon steel is a logical choice because of its favorable mechanical design properties, malleability and low cost. However, since the material of construction is dictated by the process of each particular system for which the trays will be used many different material types may be required because of unique properties which allow some mate to have resistance to corrosion and to maintain their mechanical strength at elevated temperatures.
The most common tray materials that Saiptech utilizes are listed below starting from least expensive:
  • Carbon steel
  • Stainless steel: 410s/304/316L/321
  • 2205/2507 Duplex Steel
  • Titanium
  • Nickel Monel
  • Plastic PE/PP/PVDF
  • Hastelloy

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