visual hydraulics - environmental xprt · 2019. 6. 26. · section 11 – aeration tank effluent...
TRANSCRIPT
Visual HydraulicsVisual HydraulicsHydraulic Modeling Software
Innovative Hydraulics
Visual Hydraulics DemonstrationVisual Hydraulics Demonstration
• Program overview
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• Standard features
• Special features
• Sample hydraulic profile
• Questions/comments
• Special features examples
What can Visual Hydraulics model?What can Visual Hydraulics model?
• Full flow pipes • Open channels/tanks
• Gates/orifices/baffles • Weirs
• Flumes • Racks/screening devices
• Tank launders • Filter media
• Venturi meters • Contractions/enlargements
Standard Features
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What can Visual Hydraulics model?What can Visual Hydraulics model?
• Unique/unequal flow splits
Special Features
• Special losses with known hydraulic data
• Manifolds/Diffusers
• Submerged weirs
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Sample Hydraulic ProfileSample Hydraulic Profile
• Model a section of a wastewater treatment plant, from the outfall back through the aeration tanks
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Aeration tanks
Final clarifiers
Chlorine tanks
Plant effluent channel
Step 1 Step 1 –– Starting water surface elevationStarting water surface elevation
• Water level at plant outfall = 850.75 (known value)
• Other option – Determine starting water surface elevation from a weir
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Step 2 Step 2 –– Specify plant flowsSpecify plant flows
• Visual Hydraulics can model any number of plant flow conditions,including return flows. For this example, assume the following plant design flows:
Forward flows:
Minimum flow: 4 mgd
Average flow: 8 mgd
Max monthly flow: 13 mgd
Peak design flow: 20 mgd
Minimum flow: 2 mgd
Average flow: 4 mgd
Max monthly flow: 5 mgd
Peak design flow: 6 mgd
Return flows:
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Step 3 Step 3 –– Begin the hydraulic profile!Begin the hydraulic profile!
Start calculating the hydraulic profile by working upstream of your downstream control point, which in this case is the plant outfall.
Section 1 – Outfall effluent weir
• Weir length – 6 feet
• Weir type – Sharp crested
• Weir elevation – 852.5
• Flow over weir – 4 mgd
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Section 2 – Plant effluent channel
• Channel length – 120 feet
• Channel width – 6 feet
• Manning’s ‘n’ for concrete – 0.013
• Channel shape - rectangular
• Channel downstream invert – 847.0
• Channel slope – 0 ft/ft
• No channel bends
• Flow through channel – 4 mgd
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Section 3 – Chlorine contact tanks effluent pipes
• Pipe length – 30 feet
• Diameter – 30 inches
• Hazen-Williams ‘C’ value - 120
Fittings:Flush entrance2 – 90 degree bendsExit
• Flow through pipe – 2 mgd each (4 mgd total)
• 2 pipes total
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Section 4 – Chlorine contact tanks
• Tank length – 90 feet
• Tank width – 15 feet
• Manning’s ‘n’ for concrete = 0.013
• 2 tanks total
• 0 slope, invert = 841.0
• Each tank has six 90 degree bends
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• Flow through tank – 2 mgd each (4 mgd total)
Section 5 – Chlorine tanks influent pipe from flow split
• Pipe length – 250 feet
• Diameter – 48 inches
• Hazen-Williams ‘C’ value - 120
Fittings:Flush entrance4 – 90 degree bends3 – 45 degree bendsExit
• Flow through pipe – 4 mgd
• 1 pipe
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Section 6 – Final clarifier effluent pipes to flow split
• Pipe length – 65 feet
• Diameter – 18 inches
• Hazen-Williams ‘C’ value - 120
Fittings:Flush entranceExit
• Flow through pipe – 1 mgd each (4 mgd total)
• 4 pipes total (4 clarifiers)
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Section 7 – Final clarifier effluent launders
• Launder length – 115 feet
• Launder width – 2 feet
• Launder invert at outlet = 853.8
• 4 launders total (4 clarifiers)
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• Launder slope = 0 ft/ft
• Flow per launder – 1 mgd each (4 mgd total)*
* 0.5 mgd for half of the launder
Section 8 – Final clarifier effluent weirs
• 90 degree v-notch weir
• V-notch invert = 855.0
• Notches per tank = 265
• 4 weirs total (4 clarifiers)
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• Flow over weir – 1 mgd each (4 mgd total)
Section 9 – Final clarifier influent pipes from flow split
• Pipe length = 65 feet
• Pipe diameter = 24 inches
• 4 pipes total
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• Hazen-Williams ‘C’ value - 120
Fittings:Flush entrance1 – 90 degree bendsExit
• Flow through pipe – 1.5 mgd each (1 mgd forward flow, 0.5 mgd return flow)
Section 10 – Aeration tank effluent pipes to flow split
• Pipe length = 325 feet
• Pipe diameter = 36 inches
• 2 pipes total
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• Hazen-Williams ‘C’ value - 120
Fittings:Flush entrance4 – 90 degree bendsExit
• Flow through pipe – 3 mgd each (2 mgd forward flow, 1 mgd return flow)
Section 11 – Aeration tank effluent weirs
• Weir type – Sharp crested
• Weir length – 24 feet
• 2 weirs total
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• Weir elevation – 856.5
• Flow over weir – 3 mgd each (2 mgd forward flow, 1 mgd return flow)
Editing FeaturesEditing Features
• So what happens if something changes?
• Use Visual Hydraulic’s editing features to:- Change any part of your hydraulic profile- Insert a new section between two existing sections- Delete any section- Change flow conditions at any time- Take units off-line or put units on-line
• Any time a change is made, the entire hydraulic profile is automatically recalculated for you.
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Editing ExamplesEditing Examples
• Insert a section between two existing sections
- Final clarifier center well ports
- 8 ports per clarifier, 8” x 12” in size
- Invert of ports – 851.0
• Change flow conditions
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• Take units off-line
Summary FeaturesSummary Features
• Calculation summaries
• Summary equations
• Summary reports
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Special FeaturesSpecial Features
• Head loss graph
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• K value database
• Unequal flow splits
• Manifolds/Diffusers
• Special loss equations
Questions/CommentsQuestions/Comments
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You can learn more about Visual Hydraulics at www.innovativehydraulics.net