Transcript Document

CHAPTER 5
Chemical Process Drawing (CAD)
4.0
Introduction to PROCEDE
4.1:
Standard Symbols Used in Chemical Process
Drawing (CAD)
4.2:
Block Flow Diagram (BFD)
4.3
Process Flow Diagram (PFD)
4.4:
Process and Instrumentation Diagram (P&ID)
Introduction to
PROCEDE
Derived from the concept of PROCess Engineers Design
Environment
• PROCEDE is a software package mainly used in process
engineering design.
• It is a quick sketches or full size engineering simply by
using a mouse to select or pull down menus and equipment
icons.
• The major drawing tool- FLOSHEET. More than 200
process engineering equipment symbols are supplied
PROCEDE provides many options for engineers to complete projects by
having the capability to:
• Incorporate drawings and data easily into proposals, reports and other
documents created in windows word processor or spreadsheet.
• Share drawings, symbols and data over a network. This is especially useful
for collaborative team work.
• Include logo and design standards in customized spec sheet layouts.
• Export and import drawings as DXF format for use with AutoCAD,
Intergraph and other packages.
With FloSheet you can produce:
•Process flow-sheet
•Plant layout
•Control system
•Logic charts
•Circuit diagram
•Engineering diagram
PROCEDE has 4 main software tools:
• Flosheet – a drawing program
• SpecSht – a specification (data) sheet
manager
• SymGen – a symbol library manager for
the drawing program
• SpecGen – a specification sheet builder
Typical Applications of FloSheet:
• Designing pilot plants
• PFDs (Process Flow Diagram)
• P&IDs (Process and Instrumentation Diagram)
• Symbol design
• Reports and presentations
• Exporting and importing drawings using DXF
• Process flow data managements
Symbols For Process Flow
Diagrams
Different Line Types
Different Pipe Supports
Symbols for Fitting and Representations
Symbols for Valves
Symbols for Valve Actuators
Symbols for Instruments
Symbols for Process Equipment
Symbols for Process Equipment
Symbols for Process Equipment
Block Flow Diagram
(BFD)
• The block or rectangles represents unit operations and the blocks
are connected by lines representing the process flow streams.
•Process flow streams may be mixtures of liquids, gases and solids
flowing in pipes or ducts, or solids being carried on a conveyor belt
•Unit operations such as mixers, separators, reactors, distillation
columns and heat exchangers are usually denoted by a simple
block or rectangle
•Groups of unit operations may be noted by a single block or
rectangle
•Process flow streams flowing into and out of the blocks are represented
by straight lines
•The direction of flow of each of the process flow streams must be
clearly indicated by arrows
•Flow streams should be numbered sequentially in a logical order
•Unit operations should be labeled
•The diagram should be arranged so that the process material flows from
left to right with upstream units on the left and downstream units on the
right
PFD (Process Flow Diagram)
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A PFD is a diagram of a fluid flow system showing the equipment items
connected by the major process pipes and containing data on the essential
process control circuits or major process requirements. The drawing is not
to scale and the equipment items are represented by symbols.
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The main equipment items and flow streams should be identified and
included in tables which identify process requirements in sufficient detail
to enable production of the Piping and Instrument Diagrams
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The Flow diagram shows all the essential parts of the process and items of
equipment in sufficient detail to enable the analysis and calculation of the
physical characteristics of the system to be undertaken
A PFD should include:
• Process Piping
• Major equipment symbols, names and identification numbers
• Control, valves and valves that affect operation of the system
• Interconnection with other systems
• Major bypass and recirculation lines
• System ratings and operational values as minimum, normal and maximum
flow, temperature and pressure
• Composition of fluids
Figure 2: PFD (Process Flow Diagram) for Chemical Process
Piping Instrument
Diagram (P& ID)
Piping and Instrument Diagrams
• The P & I diagram allows the design to progress from the "Process Flow
Sheet / System and Piping diagram" to the final system design and
installation stage.
• The P&ID are definitive and comprehensive diagrams showing all of the
equipment, piping, valves and instrumentation.
• All items to be identified using a standard numbering systems.
This normally entails having a unique plant item number for each item of
equipment, valve, instrument and line.
• Ideally the line number should include a size, material and fluid contents
identifier to enable the anyone reading the drawing to obtain this
information without having to refer to other documents.
A P& ID should include:
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Instrumentation and designations
Mechanical equipment with names and numbers
All valves and their identifications
Process piping, sizes and identification
Miscellaneous - vents, drains, special fittings, sampling lines, reducers,
increasers and swagers
Permanent start-up and flush lines
Flow directions
Interconnections references
Control inputs and outputs, interlocks
Interfaces for class changes
Seismic category
Quality level
THE END