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Sara, Dave, Leah and Rebecca met at the plant today. The upwelling that Kevin measured previously was remeasured to confirm the significance of the bypass around the bottom panel. Today the height difference in the tube versus in the tank was 3/4". This was still considered significant enough that it was decided that the bottom of the tank would have to be caulked. The tank was was shut off drained and cleaned out to prepare for the caulking. A clear glass 400mL beaker and a large plastic 1000mL beaker were brought to the plant to test the sampling methods that will be used for the alternative method. The glass beaker was determined to be better. Rebecca calculated the time that the beaker sample would have to settle to be equivalent to the settling tubes. It was determined that instead of insulating the tube settlers to prevent the temperature change from affecting settling the tubes were submerged. The apparatus to keep the tubes submerged and at 60 degrees was also determined. They will be suspended off of a tube resting across the dividers. Strings will run down from the resting cross bar to the glass settling tube to hold it in place. To keep air in solution and keep it from bubbling out in the turbiditmeters and skewing data, the outlet from the turbidity meters is going to be raised to increase the pressure in the system and keep the air in solution. Dave is figuring out the necessary height to create enough pressure to keep the air in solution. Leah will also be implementing her entrance tank this upcoming week while the tank is off for caulking. Tom will be adding in the digital flow meter on Friday.
February 25, 2008
Sara, Dave and Kevin met at the plant to check on the status of the flow meter and make sure that the tank was dry prior to calking on Friday. The pressure head and entrance tank setup was discussed. The turbidity tube set up was adjusted to allow for the pressure head device and we set up the schedule for the week and decided on a format for posting the individual gannt charts on the wiki.
Day | Task for Week of FEB 24-29 |
|---|---|
Monday | Alter turbiditimeter outlet to raise pressure; implement settling tube suspension system |
Tuesday | Fix Baffles (loose screws etc) |
Wednesday | Changing Rapid Mix to accommodate entrance tank |
Thursday | Caulk the bottom panel of tank |
Friday | Implement all changes and restart the tank |