Flow Control Module Design Program
The Flow Control Module (FCM) design program dictates those values necessary in the design of the flow controller. This is important in the overall design of the plant to ensure the correct alum dose is applied to the raw water being treated. This program requires inputs from the user and from our basis of design in order to determine the design and dimensions necessary to generate the AutoCAD drawing and design report. It also requires information calculated from various fluids functions.
Flow Control Module Design Program Algorithm
Flow Control Module Program Inputs
Flow Control Module Program Outputs
Algorithm
The FCM program calculates the diameter of the flow controller tube, the maximum allowable flow rate through the flow controller tube, and the head loss associated with the flow controller.
First the FCM program calculates the maximum alum flow based on in the inflow from the plant, the maximum concentration of alum allowable (per dose), and the concentration of alum in the stock tank. These values are found within the fluids functions and user inputs.
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This flow rate can then be used to determine the nominal diameter of the tube. First the maximum allowable flow rate through the valve must be calculated based on the maximum laminar flow through a reasonable length tube, the maximum head loss through the float valve, and available tube diameters.
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The diameter of the tube is obtained by comparing the maximum and minimum diameters needed to meet certain constraints. The following equations outline those constraints.
The maximum diameter is calculated that will give the desired maximum head loss.
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The minimum diameter is found based on the maximum Reynolds number for laminar flow (2100).
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The minimum diameter is calculated based on the desired head loss at a maximum flow rate using the minimum tube length available. This calculation is derived from the Hagen-Poiseuille equation.
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The tube diameter is then selected based on diameter required for laminar flow and the diameter required for head loss. The largest of the two is chosen.
Finally, the length of the tube is determined using the Hagen-Poiseulle equation and the diameter of the tube found in the previous step.
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The FCM program also calculates the viscosity of the alum based on given molecular weights, as well as data found by Gurevich, R.A.
(Include diagram of FCM)