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Sieve Tray

Sieve trays became a dominate tower internal for mass transfer columns in the 1950’s owing to their simple shape and ease of manufacture. This made sieve trays a popular device for extensive research and as a result, a considerable amount of experience has been gained for tray design and its application. Sieve trays are flat perforated plates in which vapour is forced through the holes into the cross flowing liquid. Vapour flow prevents liquid from leaking (weeping) through the holes. At low vapour velocities, liquid weeping through the holes occurs, which bypasses a portion of the tray active area and reduces efficiency, giving sieve trays relatively low turndown (approx. 2-2.5:1).


Saiptech has the capability to design and manufacture virtually any type of sieve tray. Tray hole sizes down to 3.2 mm and up to 16 mm in diameter are offered.



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
  • Type 410S stainless steel
  • Type 304 stainless steel
  • Type 316L stainless steel
Other fairly common materials for tray fabrication are as follows:
  • 317L stainless steel
  • 321 stainless steel
  • 347 stainless steel
  • 904L stainless steel
  • 2205/2507 Duplex Steel
Saiptech has experiences and skills at tray fabrication, utilizing many of materials bellow such as:
  • Titanium
  • Nickel
  • PE/PP
  • Hastelloy
  • C-PVC
  • Teflon
  • Aluminum

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