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Calculating Orifice Sizes and the Dual Scale for the Lever Arm.

During the fall of 2009, we calculated the two orifice sizes and developed the dual scale for the lever arm. Our goal was to meet the needs of the upcoming AGALTECA plant, which has a maximum flow rate of 6.3 L/s, maximum alum stock dosage of 125 gm/L, and a maximum target alum target rate of 100 mg/L. The two orifice sizes that we calculated were .082 inch and .044 inch. Because the dosage tube is so wide(3/8 inch), these two orifices control the flow of alum from the constant head tank to the entrance tank. Plant flow rate, the alum flow rate, orifice size, delta h, and the distance along the lever from the pivot point(dual scale) are related to one another and we utilized this relationship to develop both the dual scale and the orifice size at the same time. The mathcad file "2009 NCDC Lever Arm Calculations" links these different parameters and is designed to serve as a tool to enable the user to develop both the best orifice sizes and the dual scale.

We first linked the plant flow rate to the

Contributors

  • "Monica Hill, mkh62@cornell.edu"
  • "Yoon Choi, yyc6@cornell.edu"
  • "Dale Johnson, dejohn@gmail.com"

Bibliography

Deliverables

*Final hydraulic component list-2009 NCDC Component List
*Final orifice and dual scale calculations-2009 NCDC Lever Arm Calculations
*Hydraulic components for the lever arm
*Dual scale engraved on the lever arm

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