Plate Settler Hydraulic Loading
Flow per Unit Projected Area
Hydraulic loading describes the flow imposed on the settling area. Kept within design limits, it ensures particles have time to reach a plate before being carried over.
Plate Settler Hydraulic Loading
Hydraulic loading rate is numerically the flow per unit projected settling area — closely related to surface loading rate and expressed in the same units (m³/m²·h, i.e. m/h).
The key design principle is that the rise velocity of water between the plates must stay below the settling velocity of the particles to be removed. Excessive hydraulic loading shortens residence time and pushes solids over the weirs.
Even flow distribution across all plates is essential: if part of the plate pack is hydraulically overloaded while another is starved, effective capacity drops well below the nominal rating.
HLR = Q / A_projectedHLR = hydraulic loading rate [m/h]; equivalent to overflow / surface loading rate for a plate settler.
Design Targets
Free Sizing Check
Try the interactive Plate Settler Sizing Calculator, or send us your flow and water-quality data for a preliminary sizing at no cost.
Key Considerations
Inlet Design
A well-designed inlet and distribution system keeps loading uniform across the plate pack.
Weir Loading
Outlet weir loading rate is checked alongside hydraulic loading to avoid localized draw-down.
Peak Conditions
Verify hydraulic loading at peak flow, not just average.
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Our engineers will review your application, flow rates, and water quality data to recommend the optimal plate settler configuration.