vortex technology and applications

Where Flow Measurement Meets Innovation…

Vortex Technology and Applications

SLT Corporation


Presentation Overview

• History of Vortex Shedding Technology

• Vortex Shedding is all around you

• Vortex Shedding in measurement

• Understanding your Applications

• Knowing your options

• Using the sizing software


History of Vortex Shedding Technology

• Da Vinci observed vortex shedding in 1516

• Von Karman provided an empirically determined

formula for it in 1911-1912.

• Allen Rodely & Charlie McMurtry developed this

technology working at Eastech Corp. in the

early 1970’s.

F = v/d x Sf D = shredder bar width

F = vortex frequency

V = inlet velocity,

Sf = Strouhal factor, constant over wide Reynolds # in the measuring range


Vortex Shedding is all around you !

• Flags waving

• Road signs shaking in high winds

• Cloud formations over large land masses

http://street.safeshopper.com/6/cat6.htm?809

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Vortex Shedding is all around you !


Vortex Shedding in Flow Measurement

• Bluff body induces low pressure pulses (vortices) on

opposite sides

• Piezo electric crystals located on the opposite side of bluff

body to convert pulses into voltage signals

• Voltage signal (pressure pulse) is directly proportional to

volumetric flow rate

• Sensors NEVER come into contact with the fluid



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Dual Piezo Technology

One sensor picks up one signal +

noise.

Two sensors pick up two vortex

signals, 180° out of phase + two

noise signals 180° in phase.

Out of phase signal is amplified,

in phase signal is not.

TWO PIEZO ELECTRIC SENSORS

(Behind Stainless Steel Wall)

A

B

Time

B

Time

A

C

180° out of phase

Electronics Filtering



• Measure Steam, Gas and Liquids

• No moving parts

• No leak paths to sensors or electronics

• Wide turndown

• True linear meter

• Accurate for custody transfer

• Unlimited line size

• Hot tap option

Technical Advantages



• Reynolds number less

than 10000

• High viscosity liquids

• Not recommended for

batch control

Technical Limitations



Standard Piping Requirements

Understanding your Applications

Straight Run Piping Requirements Upstream Downstream

One 90º elbow before the meter 10 D 5 D

Two 90º elbows before the meter 15 D 5 D

Two 90º elbows out of plane

before the meter

30 D 5 D

Reduction before the meter 10 D 5 D

Regulator or Valve partially closed

before the meter

30 D 5 D

D is equal to the internal diameter of the pipe.


Benefits for Liquids


• No Moving Parts

• 30 to 1 turndown in most liquids

• Liquids with suspended particals

– Sand, dirt, dust, salt, grains, seeds ect

• Great for Conductive & Non-conductive

Considerations for Liquids

• Non-compressible fluid can have pressure

pulsations. Must be away from pumps.

• Piping requirements


Benefits for Gases


• Wet or Dry Gases

• Meter accuracy is forever constant

• Frequency will not change with density

• Meters will never need recalibration

Considerations for Gases


• Min & Max Flow Ranges


Benefits for Steam


• Solid Stainless Steel Construction

• Water Slugs will not damage meter

• Meter is .25% repeatable for application adjusting

• No internal o-rings, seals or gaskets to replace or service.

• A completely maintenance free steam flow meter

• Meters will never need recalibration

Considerations for Steam


• Min & Max Flow Ranges


NEW Meter Tagging and Application

Identification

• Each new meter will come equipped with its own

identification tag.

• This tag will show important information about the model of

the vortex flow meter, the application serial number, and the

meter’s flow range.

• All installation manuals will also have a duplicate tag

located on the front cover of each manual.

• End user immediately identify the matching installation

manual with the corresponding vortex flow meter.


LPIV Low Profile Insertion Vortex


• Electron Beam Welded

• Holding Nut & Alignment Pin

• Alignment Mounting Assembly

• Explosion Proof Enclosure

• Weather Proof Multi Pole Connector

• Microtel Smart TX

• Quick and easy installation

• Line sizes 2” – 24” (50mm – 600mm)

• Comes standard with all mounting hardware

Knowing your options


Lines from 50 mm – 600 mm

Gas/steam to 75 meter/sec

Liquids 0.4 to 9 meter/sec

Alignment Pin

FM approved

To up to 340 oC

Pressure up to 210 Barg

Acc. +/- 1% Reading

Rep. +/- 0.25% Reading




• Electron Beam Welded

• Removable Insertion Tool

• Explosion Proof Enclosure



• Alignment Arrow

• Quick and easy installation

• Line sizes 2” – 48” (50mm – 1200mm)

• Valve, Flange or NPT Connections


HTIV Hot Tap Insertion Vortex






Hot Tap Option

Removable Tool

FM approved

To up to 340 oC


Acc. +/- 1% Reading




• No O-Rings, Seals or Gaskets !!!

• No Leak Paths

• Machine Radius Enhance Signal Quality

• Slim Profile Meter Body

• Reduced Internals for LOW-FLOW Options

• Measures 2-3 Times Lower Flow



• Line sizes ¾” – 12” (18mm – 300mm)


VP & FVP Vortex Plate and Flanged Vortex Plate


Sizes 3/4 to 12 Inches

Gas/steam to 75 m/s

Liquids 0.4 to 9 m/s

FM approved

Flanges available

Low Flow Applications

Acc. +/- 0.5% Reading


Vortex Plate

Flanged Vortex Plate






Alignment Pin

FM approved

To up to 340 oC


Acc. +/- 1% Reading




New Extreme Pressure Flanged Vortex Pl

ate Model


API Flange & Right Gasket


Application

• American Petroleum Institute

Flanges (API) for extreme pressure,

• Special for an oil company in their oil

wells & For extreme pressure between

3500 psig – 4000 psig.


Up Coming

New Products


Microtel MASS MTX pressure and temp di

splay


Microtel MASS MTX total and rate dis

play


Tools of the Trade

Nice Instrumentation Sizing Program •Quick results

• English & Metric

• Steam, Gas & Liquids

• All Meter Types

• All Schedule Types

• Line sizes 1 – 48”

• Precise Customer

Sizing Information


THANK YOU !

SLT Corporation

Representative

SKn Tecknopark Biz#508 Sangdwon 1dong,

Jungwon-gu, Seongnam-city, Gyeonggi-do, korea

Tel. +82-31-776-4300 / Fax +82-31-776-4303

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