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10 A surface water treatment plant is being designed to process 50 mgd. The preliminary size of the flocculation tank is 96.0 ft long, with a series of six baffled compartments to create an over-under flow pattern. The tank width is 96.0 ft, and the water depth is 14.5 ft. Each of the six compartments has a horizontal shaft supporting six paddle flocculators with four arms on which to attach blades; the total number of units in the tank is 36. Up to five blades, each 15 ft by 0.5 ft, can be attached on each arm at radii of 6.5 ft, 5.5 ft, 4.5 ft, 3.5 ft, and 2.5 ft from the center line of the shaft to the center of the blades. The maximum rota- tion of the flocculators, driven by variable-speed drives, can provide a velocity of 2.5 fps at a radius of 6.5 ft (center of the outer blade). What is the minimum number of blades needed on the flocculators for a velocity gradient of 60 fps/ft? Assume a ratio of water velocity to paddle velocity of 0.3, Ca equal to 1.8, and a water temperature of 50°F. G= Р μαν p_C_Ap[v,(1-k}]" P= V₁ = 2лrN 2 n P-C4p(1-k) (2x) 2

10 A surface water treatment plant is being designed to process 50 mgd. The preliminary size of the flocculation tank is 96.0 ft long, with a series of six baffled compartments to create an over-under flow pattern. The tank width is 96.0 ft, and the water depth is 14.5 ft. Each of the six compartments has a horizontal shaft supporting six paddle flocculators with four arms on which to attach blades; the total number of units in the tank is 36. Up to five blades, each 15 ft by 0.5 ft, can be attached on each arm at radii of 6.5 ft, 5.5 ft, 4.5 ft, 3.5 ft, and 2.5 ft from the center line of the shaft to the center of the blades. The maximum rota- tion of the flocculators, driven by variable-speed drives, can provide a velocity of 2.5 fps at a radius of 6.5 ft (center of the outer blade). What is the minimum number of blades needed on the flocculators for a velocity gradient of 60 fps/ft? Assume a ratio of water velocity to paddle velocity of 0.3, Ca equal to 1.8, and a water temperature of 50°F. G= Р μαν p_C_Ap[v,(1-k}]" P= V₁ = 2лrN 2 n P-C4p(1-k) (2x) 2

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
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10 A surface water treatment plant is being designed to process 50 mgd. The preliminary size of the flocculation tank is 96.0 ft long, with a series of six baffled compartments to create an over-under flow pattern. The tank width is 96.0 ft, and the water depth is 14.5 ft. Each of the six compartments has a horizontal shaft supporting six paddle flocculators with four arms on which to attach blades; the total number of units in the tank is 36. Up to five blades, each 15 ft by 0.5 ft, can be attached on each arm at radii of 6.5 ft, 5.5 ft, 4.5 ft, 3.5 ft, and 2.5 ft from the center line of the shaft to the center of the blades. The maximum rota- tion of the flocculators, driven by variable-speed drives, can provide a velocity of 2.5 fps at a radius of 6.5 ft (center of the outer blade). What is the minimum number of blades needed on the flocculators for a velocity gradient of 60 fps/ft? Assume a ratio of water velocity to paddle velocity of 0.3, Ca equal to 1.8, and a water temperature of 50°F.
Transcribed Image Text:10 A surface water treatment plant is being designed to process 50 mgd. The preliminary size of the flocculation tank is 96.0 ft long, with a series of six baffled compartments to create an over-under flow pattern. The tank width is 96.0 ft, and the water depth is 14.5 ft. Each of the six compartments has a horizontal shaft supporting six paddle flocculators with four arms on which to attach blades; the total number of units in the tank is 36. Up to five blades, each 15 ft by 0.5 ft, can be attached on each arm at radii of 6.5 ft, 5.5 ft, 4.5 ft, 3.5 ft, and 2.5 ft from the center line of the shaft to the center of the blades. The maximum rota- tion of the flocculators, driven by variable-speed drives, can provide a velocity of 2.5 fps at a radius of 6.5 ft (center of the outer blade). What is the minimum number of blades needed on the flocculators for a velocity gradient of 60 fps/ft? Assume a ratio of water velocity to paddle velocity of 0.3, Ca equal to 1.8, and a water temperature of 50°F.
G= Р μαν p_C_Ap[v,(1-k}]" P= V₁ = 2лrN 2 n P-C4p(1-k) (2x) 2
Transcribed Image Text:G= Р μαν p_C_Ap[v,(1-k}]" P= V₁ = 2лrN 2 n P-C4p(1-k) (2x) 2
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