Audited Supplier
Saiptech's Sieve Trays
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
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| Comparison of Common Conventional Tray | ||||
| TRAY TYPE | BUBBLE CAP | DUALFLOW | SIEVE | VALVE |
| Capacity | Moderate | Very High | High | High to very high |
| Pressure Drop | High | Low to Moderate | Low to Moderate | Moderate.Older designs were somewhat higher.Recent designs same as sieve trays. |
| Efficiency | Moderate (0.6 - 0.8) | Lower compared to others (0.5 - 0.7) | High (0.7 - 0.9) | High (0.7 - 0.9) |
| Turndown | Very high Can handle very Can handle very low liquid rates | Low. Not suitable for suitable for varying loads | Approx. 2:1. Unsuitable for Unsuitable for varying loads operation | Approx. 3-5:1 Higher turndown Higher turndown designs can be provided on request. |
| Maintenance | Relatively high | Low | Low | Low to moderate |
| Fouling Tendency | High. Tends to accummulate solid particles | Extremely low. Best choice for Severe fouling | Low | Low to moderate |
| Main Application | Very low flow conditions where leakage needs to be minimized | Capacity revamps where efficiensy and turndown not critical high fouling and corrosive servies | Most columns where trundown not important | Most Columns services where turndown important |
| Cost | High -approx 2~3 times that for sieve trays | Low | Low | Marginally higher than sieve trays |
For many years, Saiptech has been a leader in engineering for mass transfer, phase separation, and reactor internals. Our innovative technology and patented high-performance products cater to a diverse clientele in industries such as petroleum, petrochemical, chemical, and environmental protection. We specialize in processes like distillation, rectification, absorption, desorption, and multiple phase separation.
Our commitment to continuous research and development, coupled with extensive engineering experience, enables us to provide comprehensive solutions to our clients. Our services encompass process simulation and optimization, de-bottlenecking, hydraulic calculation and analysis, field troubleshooting, CFD modeling, and on-site services. In our modern fabrication shop, we manufacture various equipment and components, including distillation trays, column packing, internals, and reactor internals.
We take pride in our professional and experienced staff, known for their expertise in technology, process design, equipment design, manufacturing, system integration, plant design, modifications, project management, and process consultancy. The Saiptech team, composed of seasoned chemical and mechanical engineers, consistently delivers design packages that surpass client expectations.
As a privately owned and operated company, Saiptech adheres to the core belief that clients come first. This principle has shaped our business model, emphasizing professionalism, trust, and a commitment to excellence. Our mantra of "Clients first" guides us in all our endeavors, ensuring a dedicated approach to serving the needs and achieving the goals of our valued clients.
