understanding manifolds technology and selection

Copyright © Yokogawa Corporation of America

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Pressure Transmitter

Understanding Manifolds: Technology and Selection

Liz Majestic Application Engineer

August 30, 2016


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Agenda

n Brief History on Manifolds

n Why? n Different

Categories n Industry

Selection n Best

Practices


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Brief Flashback


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Manifolds: History

n  Began in 1910 u Used with a differential recording

gage (mercury type) Ø With check valves (3)

n  But the 3-valves had problems u Leak paths, incorrect readings

n  A new design, used even today u 5- valve design

Ø Used in natural gas application n  1960, 3 valve had a new design

u Rod-out feature n  1963, 5 valve had a new design

u Space saving


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Why Manifolds?


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Manifold

n  Isolate u  an instrument from the

process n  Enable

u on site calibration u  zero check

n  Reduce u the number of potential

leak points n  Saves

u Material and labor cost u Space requirements


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Manifolds: Different Categories


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Classifications

n  Inlet/outlet connections u Threaded u Blank by Blank

or Flange by Flange

u Pipe by Pipe u Flange by Pipe

or Pipe by Flange


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Classifications n  Installed location

u Dependent on application Ø Also primary

element that is used

u Direct mount u Close coupled u Line mount u Remote mount

n  Type of instrument u Detailed on the

slides coming up.


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Block and Bleed

n Application u Gauge u Absolute

n Process connections: Male or Female NPT

n One valve provides instrument isolation.

n The other valve allows for vent/drain/calibration through the test port.


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Two-Valve

n  Application u Absolute u Gauge u High Gauge

n  Traditional u Flange x Flange u Flange x NPT

n  Wafer n  One valve provides instrument

isolation. n  The other valve allows for vent/

drain/calibration through the test port


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Three-Valve

n  Application u Differential Pressure u Draft Range u High Static

Ø Differential Pressure u Multivariable Pressure


n  Wafer n  Isolation and Equalizing

u  Used to “Zero” the Transmitter


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Five-Valve

n  Application u Differential u Draft Range u High Static

Ø Differential u Multivariable Pressure


n  Wafer n  Improves access to both high

and low side u test - pressure ports


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Natural Gas –Five valve


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Parts

n  Bonnet u Handle u Rolled Steam Threads u Bubble tight shutoff

n  Gasket u Teflon u Grafoil/Graphite

n  Material u Customer pick


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Accessories

n  Pressure/Leak Test u Testing the manifold to make sure there are no leaks

n  Sour Gas u Meets the requirement of the National Association of

Corrosion Engineers (NACE MR-01-75) for certain processes.

n  Power u Meets the requirement of ANSI/ASME B31.1

n  Oxygen Clean Service u The manifold can be then be used in oxygen and high

uncontaminated process and environments.


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Business Consumers


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Industry

n Steel n Power n Chemical n Gas n Pulp and Paper n Co-generation


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Best Practice


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Installation

n  Bolting of manifold to the transmitter u Finger-tighten the bolts u Then do a crossing pattern

Ø  First the initial torque value Ø  Then the final torque value

n  Make sure u The manifold picked out can

withstand the temperature and pressure of the application.

n  Optional Brackets u Moves the support point to the

manifold


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Thank you!


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Picture Credit

n  On Slides 12-15, 18 u Yokogawa Manifolds u Yokogawa Website

n  On Slide 7 and 16 u Process Instrumentation Manifolds

Ø By. John E. Hewson