Standard Process Flow Diagram Symbols and Their Usage
Process flow diagrams use special shapes to represent different types of equipments, valves, instruments and piping flow.
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Edraw includes standard sets of
symbols depicting mechanical equipment, piping, piping components, valves,
equipment drivers and instrumentation and controls. These PFD symbols
are assembled on the drawing in a manner that clearly defines the process flow
Process Flow Diagram Symbols - Equipment
Pumps and tanks come in a variety of designs and shapes.
Compressor is a mechanical device that takes in a
medium and compresses it to a smaller volume. A mechanical or electrical drive
is typically connected to a pump that is used to compress the medium.
Pump refers to a mechanical apparatus using suction or
pressure to raise or move liquids, compress gases, or force air into inflatable
objects such as tires. The symbols for pumps may closely resemble those for
Mixing is a gear that combine some materials or put
them together to form one substance or mass.
Mixing vessel is a container that is used to blend
several components together.
Heat exchanger is an equipment used to transfer heat
energy between two process flows. Heat exchangers transfer heat energy through
conductive and convective heat transfer.
Cooling towers transfer heat energy to the outside
air through the principle of evaporation.
Cooler is a device, container or room that cools air
through the evaporation of water or keeps cool.
Furnace means a tool for heating a continuous current
of air by means of a fire contained within the apparatus and without mingling
the fresh air with the products of combustion.
Boiler is a closed vessel in which water or other
fluid is heated.
Tank is used to store process fluids of various
types, under different process conditions.
Process Flow Diagram Symbols - Valves
Gate valve is a device used to control the flow of
liquids and gases.
Check valve, also known as one-way valve, is to
prevent the line of medium back.
Globe valve refers to a mechanism used to control or stop
the flow of liquid or gas through a pipe.
Ball valve is a valve with a spherical disc, the
part of the valve which controls the flow through it.
Butterfly valve is installed between two flanges
using a separate set of bolts for each flange.
Angle valve is oriented at a 90 deg angle of gate
Process Flow Diagram Symbols - Piping Lines
Process flow diagrams use special piping lines to represent
how signals are transmitted between equipments. These symbols are used to
identify how the instruments in the process connect to each other. And what type
of signal is being used. (electrical, pneumatic, data, etc)
All lines are fine in relation to process piping lines.
Major pipeline is for connection of the equipment in
Major Straight line is sued to connect the equipment
in the same horizontal or Vertical position.
Process connection help to create the process flow
between equipments. Double click process connection to edit description.
Process Flow Diagram Symbols - Instruments
Process Flow Diagram use symbols and circles to represent
each instrument and how they are inter-connected in the process.
Users can easily change types of the instrumentation symbols by
clicking the quick action button while designing.
With large pre-drawn examples and more than 8500 symbols, drawing couldn't be easier! Click here to know more about process flow diagram symbols.
Process and Instrumentation Symbols
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