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Spring '14 Contributions
I am working worked on the design team this semester, and our team's focus is was on Chemical Dose Controller modifications
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In order to simplify the stock solution mixing process, a function was created to take integer number of coagulant bags as input to set the coagulant stock solution concentration, and calculate solve for the stock tank volume and water depth or "fill line" iteratively. The inputs for the function are the coagulant stock tank flow rate, the time between refills, and the supplier chemical tank volume, and the outputs are the stock tank volume and dimensions. The function the number of coagulant bags to be added. It was written in a way that the dose selected by the CDC algorithm can continue to be used, and the dimensions of the tank can be calculated using existing functions. It also allows for more accurate stock concentration since the plan operator is no longer required to weigh the proper amount of coagulant in order to achieve the set concentration.
Chlorine viscosity equation
Currently the chlorine viscosity is assumed to be the same as water. Although this assumption does not generate significant errors due to the low concentration used in the plants, it is still meaningful to determine an equation for the viscosity of CaCl2 in order to improve accuracy in calculations.
CDC drawing updates
Dosing components redundancy and entrance tank height adjustment
While the existing dosing tube function was written to generate an extra dosing tube when there is only one dosing tube designed, the goal this semester was to modify the code so that an extra dosing tube would be generated at all times, and the manifold code was modified to match the changes to the dosing tubes. Since the added redundancy presented a problem with the fitting of the manifold system on the entrance tank wall when the plant flow rate is below 35 L/s, a temporary solution was to raise the height of the entrance tank wall by 0.4m. While the added height would not hinder maintenance as the raised wall height would be about the same as that of a 60 L/s plant, we recommended the future team to seek a solution that doesn't require an increase in construction costsThere are a few updates to the drawing that need to be done, including the drawing of flexible tubing, which requires FlexTubeF (work for the remainder of the semester).
Fall '13 Contributions
Chlorinator packaging for India
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