4 lesson 11 vertical vessels - orange coast college powerpoint... · a vertical vessel contains...
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Copyright © 2007 Fluor Corporation
Vertical Vessels
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Lesson Objectives:
Lesson Objectives
Know the basic mechanical function of vertical vessels.
Know how to calculate and fill out the Fluor standard nozzle table.
Know how to show nozzles and related callouts on the piping isometric and plan
drawings.
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Vertical Vessels Or Fractionation Tower
What is a Vertical Vessel??
A vertical vessel contains bubble trays and bubble caps which are used to
extract from a process system a certain required fraction such as butane or
propane.
These fractions are obtained by draw-offs at certain temperature points. No
chemical changes occurs. The separation results from the different boiling
points of different products.
The lighter the product, the lower the boiling point.
The desired product separation is drawn off generally as a vapor from the
top of the fractionating tower.
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The basic stock for typical refinery operations is crude oil. Crude oil consists of
thousands of different combinations of carbon and hydrogen atoms and arranged
into molecules. These molecules have its own boiling point temperature. A group of
several molecules with a narrow range of boiling point is called a fraction.
The crude oil is first heated to approximately 700ºF and is pumped into the “flash
zone” of the fractionation column. The crude oil separates into a liquid and vapor in
this zone. Petroleum with a low boiling point temperature vaporizes and rises
towards the top within the fractionation column. As the vapors rise the higher
boiling point vapors condense and become a liquid. This liquid runs over bubble
trays which slows down the rising vapors and helps to capture liquids as the vapors
condense. The vapors are at a higher temperature than the liquid, thus keeping the
boiling point constant.
A desired fraction is side-streamed from the fractionation column through nozzles
or piping set at specific levels. This fraction is then pumped to a different section of
the refinery for further processing.
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Preliminary Piping and Instrumentation Diagram
Lighter fractions are normally used for gasoline. These fractions are normally in a
vaporized state and is sent to an overhead condenser which cools the vapor and
turns the vapor into a liquid. This liquid is then sent to a horizontal vessel for
temporary storage until further refining is required. Some of the condensed liquid in
the horizontal vessel is pumped back up to the top of the distillation column as
reflux. Reflux is used to keep the trays from drying out. The vapors within the
horizontal vessel is side-streamed to manufacture methane, propane, and butane.
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Trayed Tower Nozzle Names
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Tower Skirt
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Vapor Liquid Flow
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Tower Areas Of Division
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Typical Arrangement
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Typical Arrangement
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Mobile Equipment
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Considerations For Tower Elevation
The elevation, or height above grade to the vertical vessel tangent line is dependent
on
NPSH REQUIREMENTS
MAINTANENCE REQUIREMENTS
MINIMUM CLEARANCE
COMMON ACCESS
REBOILER MAINTANENCE
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OPERATORACCESS
MAINTENANCEACCESS
MINIMUM CLEARANCE
COMMONACCESS
VERTICALREBOILER
Access And Clearance
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Elevation And Orientation Requirements For
Maintenance Access
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Elevation And Orientation Requirements For
Maintenance Access
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DOWNCOMER
Examples Of Downcomer Trays
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Opposing Downcomers
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Arrangement Reboiler
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Reboiler Connections
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Top Head Arrangement
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Typical Platform Arrangement
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Tower Platform And Ladder Elevation Requirements
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Platform Width Requirements
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Maintenance Access Arrangements
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Platform Orientation
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Tower Piping Supports
Pipe supports for vertical vessels should be located as close to the line’s nozzle as
possible. By locating the pipe support close to the nozzle the loads exerted onto the
nozzle will become decreased.
Pipe guides should be spaced soas to not restrict the flexibility of the pipe. See 000
250 2650.
The “L” dimension of a pipe is the distance between the back of the pipe to the
outside diameter of the vessel shell or outside diameter of vessel insulation.
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Relief Valve Systems
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Tower Piping Arrangement
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Arrangements For Level Instruments
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Temperature And Pressure Instrument Arrangements
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Common Bridle-Level Instrument Arrangement
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Utility Station Requirements
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Plan Drawing Of The Vertical Vessel
Nozzle Block Chart shows centerline coordinate drop of vertical pipe.
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N0.SIZEAND
RATING
CENTERLINE
ELEVATION(OR AS NOTED)
ORIEN-
TATION PROJECTION
NORTH
CENTERLINE COORDINATE DROPEQUIP.
EAST
NOZZLE BLOCK CHART
Block Nozzle Chart
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Copyright © 2007 Fluor Corporation
VIEWS
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Towers
REFERENCE: Shell Goal Venture - Geismar Plant
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Towers
REFERENCE: Shell Goal Venture - Geismar Plant
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Towers
REFERENCE: Shell Goal Venture - Geismar Plant
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References:Practices #
000.250.2650 - Vessel Layout and Orientation - Piping
000.250.2651 - Vessel Layout and Orientation - Trays
000.250.2660 - Vessel Layout - Classification of Vessel versus Piping
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Questions??
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Exercise PI-E11D
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Test PI-T11
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