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API Series Oil/Water Separators Sizing Spreadsheet

Below is a link to an API oil water separator sizing spreadsheet developed by Hydro-Flo Technologies.

By inputting the major design criteria, you can solve for the separation chambers width to length to depth ratios.

The spreadsheet operates on Microsoft Excel 2003 or later.

API sizing calculations

Below is a sample shot of the spreadsheet.

Hydro-Flo Technologies, Inc.
The Art and Science... of Wastewater Treatment 
           
  Company  
  Location  
           
API Separator Calculations          
           
USER INPUT IN YELLOW        
Design Flow rate (in gpm) 250        
Temperature (in deg F) 60        
Specific Gravity of the Oil (in g/cm3) 0.850        
Oil Droplet size (in microns) 150        
Density of the Water (in g/cm3) 0.99890        
Viscosity (in Poise) 0.01129        
           
For more detailed information go to www.HydroFloTech.com  
           
  RESULTS    
  Width of separator in feet 6.500    
  Depth of separator in feet 2.500    
  Length of separator in feet 32.500    
           
Oil Droplet (in cm) 0.015        
           
Call 630-762-0380 to talk to a Hydro-Flo application engineer  
           
  Minimum Allowable Result Design Maximum Allowable Result    
terminal velocity (in cm/s) 0.162 0.162 0.162    
terminal velocity (in ft/min) 0.318 0.318 0.318    
Minimum cross sectional area needed (in ft) 11.139 11.139 11.139    
Cross Sectional Area (in square feet) 11.139 16.250 160.000    
maximum horizontal velocity (15*vt, but must be <=3) 3.000 3.000 3.000    
horizontal velocity (in ft/min) 3.000 2.057 0.209    
vh/vt 9.423 6.459 0.656    
short-circuiting factor 1.491 1.395 1.194    
Length of unit (must be at least 5X of width) (in ft) 5.000 32.500 100.000    
length/width 5.000 5.000 5.000    
minimum horizontal area 156.527 146.444 125.341    
Width of channel (in feet) (must be 6 to 20) 1.000 6.500 20.000    

Depth (in feet)
0.300 2.500 10.000    
Depth/Width Ratio (must be .3 to .5) 0.300 0.385 0.500