Calculations
Calculations
Sigma Mechanized inclined screen grid
Default
Input data
Channel width (L)
Channel height (H)
Upstream maximum liquid level of project (C)
Downstream liquid level (Hj)
Maximum flow (Qmax)
Grid dimensions
Specific mass of debris
Obstruction
Output data
Daily retained debris
Maximum velocity in the grid
Liquid height without obstruction before the second screen
Upstream heigth
Total head loss without obstruction
Upstream height with clean grid
Condition without obstruction
Total head loss with obstruction
Liquid height before the grid, with obstruction
Condition with obstruction
Mass of debris retained
Work rotation
Commercial power adopted
Description
Calculates the rotation, power and head loss of a Sigma bar screen, given its specification and the inflow channel geometry. Estimates for the quantity of daily retained debris are also given.
Grid dimensions
Round orifice - alternate disposition
| # | Diameter - D (mm) | Distance between orifices - EC (center to center) (mm) | Efficiency / Open area |
|---|---|---|---|
| 1 | 1 | 2 | 0,225 |
| 2 | 1,5 | 2,6 | 0,3 |
| 3 | 2 | 3,4 | 0,31 |
| 4 | 2,5 | 4 | 0,35 |
| 5 | 3 | 5 | 0,325 |
| 6 | 4 | 6 | 0,4 |
| 7 | 5 | 7,5 | 0,4 |
Note
This memorial can be used for preliminary purposes; the definitive calculations must be performed by Sigma.
More information can be found at: https://sigma.ind.br