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One of the proposed designs for incorporating the alum doser was to use long, spiraled tubing that connects the alum stock to the influent water entering the filter. Calculations were done in order to determine the parameters associated with the spiral tubing. Unfortunately, it was discovered that in order for this design to work, the exit tubing would need to be approximately 3.5 meters in length. This is too large for the desired size of our unit.
Calculations
Download the Spiral Tubing Design MathCAD File here.
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The user inputs the maximum turbidity (used to determine the alum dose concentration), the desired flow rate of alum (converted to liters/day), and the diameter of tubing, which is used to determine the area of tubing. The inner diameters of available tubing can be found on McMaster-Carr: http://www.mcmaster.com/#tubing/=bdk5q3.
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