wedge flow element

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Wedge Flow Element

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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