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Wedge  Flow Element. 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. Simple Design - Easy to Understand. No Moving Parts. P1. P2.

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Wedge  Flow Element

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Wedge flow element

Wedge Flow Element


Wedge flow element

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


Wedge flow element

  • Simple Design - Easy to Understand

  • No Moving Parts

P1

P2

Wedge Flow Element

Q P


Wedge flow element

Wedge Flow Element

V1

V2

P1 P2

Permanent

Pressure Loss


Wedge flow element

Wedge Flow Element

Physical Attributes

Dirty Service

Chem Tee (Flush Mtg.)

(1630LF)

3” Flange Tap Connection

(1630LF)


Wedge flow element

WEDGE Flow Element Physical Attributes

Clean Service

1/2" NPT

Connection

Pipe Tap Connection (1610LF)

1/4" NPT

Direct Connect Integral WEDGE

(1335LZ-1337LZ)

Wafer Water & Gas Injection (1615LW)


Wedge flow element

H/D Ratio of

0.2

0.3

0.4

0.5

D

H

Wedge Characterized by H/D to Handle Different Flow Ranges

Determining beta ratio d/D:

Orifice Plate: d=orifice bore diameter, D=pipe inside diameter

Wedge equivalent beta ratio for H/D ratio selected:

for H/D Ratio ofuseß

0.20.38

0.30.50

0.40.60

0.50.70


Wedge flow element

The Wedge Element Advantage

Flexibility and Adaptability

Wedge ElementWedge ElementDP Transmitters

Process Conn. Materials Connections

  • 316 SS

  • Carbon Steel

  • Hastelloy1 alloy*

  • Monel2 alloy*

  • Other exotics

  • Threaded

  • Flanged

  • Wafer

  • Direct connected

  • Pipe tap

  • Remote seal elements

* Available upon request

1 Trademark of Cabot Group

2 Trademark of Huntington Alloy, Inc., The International Nickel Company, Inc.


Wedge flow element

The Wedge Element Advantage

  • Lower permanent pressure losses than orifice plate mean lower pumping costs for the life of the installation

100 -

90 -

80 -

70 -

60 -

50 -

40 -

30 -

20 -

10 -

Orifice Plate

Pressure Loss % of Meter Differential

Flow Nozzle

Wedge

0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

Beta Ratio


Wedge flow element

KD 2

Calibration Performed with Water

.920

.900

20,000 25,000 30,000 35,000 40,000 45,000 50,000

Pipe Reynolds No. RD

Typical Linear Curve

(Low Reynolds Number)

1-1/2” (40mm) Pipe Size 0.4 H/D

KD 2

Calibration Performed with Glycerine

.940

.920

.900

.880

.860

.840

200 400 600 800 1000 1200 1400 1600 1800

Pipe Reynolds No. RD


Wedge flow element

Typical Linear Curve

(High Reynolds Number)

3” (75mm) Pipe Size

KD 2

.3H/D

Water - Average KD 2 = 1.773 Air - Average KD 2 = 1.772

2.20

2.00

1.80

1.60

.2H/D

Water - Average KD 2 = 1.005 Air - Average KD 2 = .995

1.40

1.20

1.00

.80

0 100 200 300 400 500 600 700 800 900 1000

Pipe Reynolds X 1000


Wedge flow element

Performance Evaluation

Upstream Piping Effects


Wedge flow element

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


Wedge flow element

When to Use the Wedge

  • Chemical industry - Batching, blending, mixing dyes and viscous fluids

  • 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


Wedge flow element

WedgeMaster Flow System


Wedge flow element

WedgeMaster Connections

3” (76mm) Flange

Tap Connection

1630LF

Chemical Tee Connection

1630LF


Wedge flow element

WedgeMaster Flow System

  • 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


Wedge flow element

Comparison

Wedge vs Orifice Plates

  • Disadvantage

  • Less Application History

  • Initial installed cost

  • 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)


Wedge flow element

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


Wedge flow element

Comparison

WedgeMaster vs Turbine Meter

  • Advantage

  • No Moving Parts

  • Corrosive, Dirty Fluids

  • Viscous Fluids

  • Less Pressure Loss

  • Disadvantage

  • Non-linear Output


Wedge flow element

Wedge vs Turbine Meter

Turbine

0.5%

10:1

>30000

linear

1” - >12”

(25 - >300mm)

  • Specification

  • Accuracy

  • Turn Down

  • Reynolds No.

  • Output

  • Sizes

WedgeMaster

0.5%

4:1

>500

square root

1/2” - >24”

(15 - >600mm)


Wedge flow element

Comparison

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


Wedge flow element

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


Wedge flow element

Comparison

Wedge vs Positive Displacement

  • Disadvantage

  • Non-linear Output

  • Greater Piping Requirements

  • No Custody Transfer Applications

  • Advantage

  • Much Lower Cost

  • No Moving Parts

  • Lower Pressure Loss

  • Slurry Applications

  • Steam and Dirty Gas Applications


Wedge flow element

Wedge vs Positive Displacement

WedgeMaster

0.5%

4:1

>500

square root

1” - >24”

(25 - >600mm)

  • Specification

  • Accuracy

  • Turn Down

  • Reynolds No.

  • Output

  • Sizes

P. D.

0.5% +

20:1

variable

linear

1” - >12”

(25 - >300mm)


Wedge flow element

Comparison

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


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