Product Name: Sieve Tray with High Capacity and Lower Cost Model NO.: Sieve Tray Material: Stainless Steel Manufacturing Process: CNC Milling Type: Distillation Equipment Trademark: SPT Origin: China HS Code: 84199090 Product Description Saiptech's Sieve TraysSieve 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.Comparison of Common Conventional TrayTRAY TYPEBUBBLE CAPDUALFLOWSIEVevalVECapacityModerateVery HighHighHigh to very highPressure DropHighLow to ModerateLow to ModerateModerate.Older designs were somewhat higher.Recent designs same as sieve trays.EfficiencyModerate (0.6 - 0.8)Lower compared to others (0.5 - 0.7)High (0.7 - 0.9)High (0.7 - 0.9)TurndownVery high Can handle very Can handle very low liquid ratesLow. Not suitable for suitable for varying loadsApprox. 2:1. Unsuitable for Unsuitable for varying loads operationApprox. 3-5:1 Higher turndown Higher turndown designs can be provided on request.MaintenanceRelatively highLowLowLow to moderateFouling TendencyHigh. Tends to accummulate solid particlesExtremely low. Best choice for Severe foulingLowLow to moderateMain ApplicationVery low flow conditions where leakage needs to be minimizedCapacity revamps where efficiensy and turndown not critical high fouling and corrosive serviesMost columns where trundown not importantMost Columns services where turndown importantCostHigh -approx 2~3 times that for sieve traysLowLowMarginally higher than sieve trays