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The flow through the alum doser exit tubing was determined given user-defined parameters for the dimensions of the alum stock tank, such as height of tank (and thus, height of alum level) and diameter of exit orifice (and thus, diameter for the attached plastic tubing).
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Next, using the previously determined flow through the exit tubing, the flow through each of the orifice plates can be easily determined.
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Then, head loss through both the tubing and orifice plates are calculated given user input for width and number of orifice plates along with the length of the desired tubing. This total head loss through the system is the summation of the head loss through the orifices plates and the head loss through the wider, encompassing tubing.
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Using this information, the necessary flow of alum from the doser based on dimensions given above is determined. Using a stock dose concentration of 1.5 mg/L, the necessary stock concentration is found as well.
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The following section calculates the flow of alum given varying alum stock heights (of 5 inches to 25 inches). The final graph depicts results showing that if alum stock height varies greatly, the flow remains generally within the acceptable flow error. This error stems from the fact that we are not using alum for flocculation.
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