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One of the above listed scales or newly developed scale needs to be selected then coding developed so the Automated Design Tool can generate the scale template need for the CDC.
Constant Head Tank Valve and Material Research 2-4 Persons
A key component in any CDC is the Constant-Head Tank (CH Tank). The CH Tank is connected between the stock tank and the dosing device and its purpose is to mitigate the effect that a change in level in the stock tank would have on the dosing instrument. Since our CDCs rely on head as their driving force, as the stock tank level drops, the available head drops, thereby changing the flow rate through the metering device, whether it be a tube or an orifice. The CH Tank is comprised of a small reservoir with a float valve installed. As chemical is metered to the plant, the float valve opens and replenishes reservoir, meaning a fairly constant level is maintained at all times.
The current float valve is manufactured by Kerick Valve Inc. The MA2P2 or MA3P2 are both used in our plants and both have an internal orifice diameter of .093" (2.36 mm). The flow rate through the valve is limited by this orifice and as plant's increase in size, the valve will not be able to maintain the correct proper level in the CH Tank. In fact, two CH Tanks are installed in parallel at one of our larger plants to accommodate this issue.
A dedicated sub team is needed to research and create a data base of float valves. This information will need to be incorporated into the design tool so that the appropriate sized valve is selected for each application. The person working on this part of the team will therefore also gain experience in the design aspect of AguaClara.