1 Wedge Flow Element. 2 V - Shaped Restriction No critical surface dimension Slanted upstream and...
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Transcript of 1 Wedge Flow Element. 2 V - Shaped Restriction No critical surface dimension Slanted upstream and...
1
Wedge Flow Element
2
V - Shaped Restriction
•No critical surface dimension
•Slanted upstream and downstream faces
•No places for secondary phase build-up
•Minimal upstream/downstream piping required
•Bi-directional
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Wedge Flow Element
•Simple Design - Easy to Understand
•No Moving Parts
P1 P2
Q P
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P1 P2
V1V2
PermanentPressure Loss
Wedge Flow Element
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Wedge Flow ElementPhysical Attributes
Dirty Service
Chem Tee (Flush Mtg.)(1630LF)
3” Flange Tap Connection(1630LF)
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WEDGE Flow Element Physical Attributes
Pipe Tap Connection (1610LF)
Wafer Water & Gas Injection (1615LW)
1/4" NPT
Clean Service
Direct Connect Integral WEDGE (1335LZ-1337LZ)
1/2" NPTConnection
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Wedge Characterized by H/D to Handle Different Flow Ranges
H/D Ratio of0.20.30.40.5
HD
Determining beta ratio d/D: Orifice Plate: d=orifice bore diameter, D=pipe inside diameterWedge equivalent beta ratio for H/D ratio selected:
for H/D Ratio of use ß0.2 0.380.3 0.500.4 0.600.5 0.70
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Wedge Element Wedge Element DP TransmittersProcess Conn. Materials Connections
• Threaded
• Flanged
• Wafer
• 316 SS
• Carbon Steel
• Hastelloy1 alloy*
• Monel2 alloy*
• Other exotics
• Direct connected
• Pipe tap
• Remote seal elements
The Wedge Element Advantage
Flexibility and Adaptability
* Available upon request1 Trademark of Cabot Group2 Trademark of Huntington Alloy, Inc., The International Nickel Company, Inc.
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The Wedge Element Advantage
• Lower permanent pressure losses than orifice plate mean lower pumping costs for the life of the installation
Pressure Loss % of Meter Differential
100 -
90 -
80 -
70 -
60 -
50 -
40 -
30 -
20 -
10 -
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
Beta Ratio
Orifice Plate
Flow Nozzle
Wedge
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Typical Linear Curve (Low Reynolds Number)
1-1/2” (40mm) Pipe Size 0.4 H/D
.920
.900
KD 2
20,000 25,000 30,000 35,000 40,000 45,000 50,000 Pipe Reynolds No. RD
Calibration Performed with Water
.940
.920
.900
.880
.860
.840
KD 2
200 400 600 800 1000 1200 1400 1600 1800
Pipe Reynolds No. RD
Calibration Performed with Glycerine
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Typical Linear Curve(High Reynolds Number)
3” (75mm) Pipe Size
1.20
.80
KD 2
0 100 200 300 400 500 600 700 800 900 1000
Pipe Reynolds X 1000
.2H/D
Water - Average KD 2 = 1.005 Air - Average KD 2 = .995
1.40
1.60
1.80
2.00
2.20
1.00
.3H/D
Water - Average KD 2 = 1.773 Air - Average KD 2 = 1.772
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Performance EvaluationUpstream Piping Effects
Piping Configuration*Mean
Coefficient*(KD 2)
Mean Deviation vs.Straight Run
Piping* (% of Rate) Straight pipe runs (Note 1) 6.339 - 2 els in plane and close coupled upstream 6.307 0.5% 2 els out of plane and close coupled upstream 6.353 0.2% 1 el upstream 6.335 0.1% 6” x 4” reducer upstream 6.338 0.05% 2” x 4” expander upstream 6.312 0.4% 4” gate valve full open upstream 6.342 0.1% 4” gate valve 1/2 open upstream 6.280 0.9% 4” x 4” x 4” tee upstream with bull plugged 6.370 0.5% 4” x 4” x 4” tee upstream with run plugged 6.321 0.3% 4” x 4” x 4” Y upstream with run plugged 6.315 0.4%
*Test pipe configuration: 5-6 diameters upstream / 3-5 diameters downstreamNote 1: Straight pipe run test performed at 20 diameters upstream and 6 diameters downstream
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Wedge Family of Problem Solving Flow Elements
• Wedge elements are available in standard sizes of 1/2” to 24” (larger sizes available)
• Pipe tap, wafer and integral Wedge elements for clean liquids, gases and steam
• Remote seal Wedge elements for all fluids - clean, dirty, viscous, corrosive or erosive
• Wag Wedge for Wafer and Gas Injection Systems for oil field recovery
• Integral Wedge elements connect directly to DP transmitters
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Petrochemicals - High viscosity and black liquors
Oil and Gas - Water injection, custody transfer
Paper and Pulp - High concentration stocks. Timber industry usage
Metals and Mining - Powdered or magnetic slurries. Abrasive flows
Cement industry - Problematic slurry flows
Power and Utilities - Fuel oil and steam flows. Boiler feeds
When to Use the Wedge
Chemical industry - Batching, blending, mixing dyes and viscous fluids
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WedgeMaster Flow System
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WedgeMaster Connections
Chemical Tee Connection
3” (76mm) FlangeTap Connection
1630LF
1630LF
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• Base System Accuracy: 0.5%
• Draft Range Designed for Intended Purpose
• HART Digital Communications
• 5 Year Warranty
• Inductive Sensing• sensing & correcting of sensor temp and static press
• Surface Mount Electronics
• Local Zero & Span
• Configures From KHT & KSSW
WedgeMaster Flow System
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Wedge vs Orifice Plates
Advantage• Lower Reynolds No.
• Better Rangeability
• Accuracy not Dependent on Sharp Edge
• Lower Energy Costs
• Five Year Warranty
• Less upstream piping required
• Dirty Service (Slurries, Fluids w/Solids in Suspension)
Disadvantage• Less Application History
• Initial installed cost
Comparison
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Wedge vs Orifice Plate
Specification
• Accuracy
• Turn Down
• Reynolds No.
• Output
• Sizes
• Straight Upstream Piping
Wedge
0.5%
4:1
>500
square root
1/2”- >24”(15 ->600mm)
6 Diameters
Orifice
0.75%
4:1
>30000
square root
>1” (>25mm)
15-30 Diameters
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WedgeMaster vs Turbine Meter
Advantage
• No Moving Parts
• Corrosive, Dirty Fluids
• Viscous Fluids
• Less Pressure Loss
Disadvantage
• Non-linear Output
Comparison
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Wedge vs Turbine Meter
Specification
•Accuracy
•Turn Down
•Reynolds No.
•Output
•Sizes
WedgeMaster
0.5%
4:1
>500
square root
1/2” - >24” (15 - >600mm)
Turbine
0.5%
10:1
>30000
linear
1” - >12” (25 - >300mm)
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Wedge vs Vortex
Advantage
• Low Reynolds No.
• Viscous Fluid Applications
• Requires Less Upstream/ Downstream Diameters
• Better Accuracy
• Slurry Applications
Disadvantage
• Accuracy Affected by Density
• Non-linear Output
Comparison
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Wedge vs Vortex
Specification
• Accuracy
• Turn Down
• Reynolds No.
• Output
• Sizes
• Straight Upstream Piping
WedgeMaster
0.5%
4:1
>500
square root
1/2”- >24”
(15 - >600mm)
6 Diameters
Vortex
1.0% +
10:1+
>10000
linear
1” - >10”
(25 - >250mm)
10-30 Diameters
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Wedge vs Positive Displacement
Advantage
• Much Lower Cost
• No Moving Parts
• Lower Pressure Loss
• Slurry Applications
• Steam and Dirty Gas Applications
Disadvantage
• Non-linear Output
• Greater Piping Requirements
• No Custody Transfer Applications
Comparison
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Wedge vs Positive Displacement
Specification
•Accuracy
•Turn Down
•Reynolds No.
•Output
•Sizes
WedgeMaster
0.5%
4:1
>500
square root
1” - >24” (25 - >600mm)
P. D.
0.5% +
20:1
variable
linear
1” - >12”(25 - >300mm)
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Wedge vs Mass
Advantage
• Lower Cost
• No Moving Parts
• Lower Maintenance
• More Line Sizes
• Not Affected By Vibration
Disadvantage
• Non-linear Output
• Less Accurate
• Affected by Fluid Properties
Comparison