Process Flow Diagram Rules. In some instances such as continuing a process from the bottom of one page to the top of another you have to reverse the preferred direction. The process flow diagrams include the shapes and connectors known as process symbols which represent a task or action process or component.
For all of the diagrams discussed in this chapter there are no universally accepted standards. Drag and drop the symbols that you need to create your pfd. Major equipment is usually that which would appear in a process simulation eg aspen such as columns reactors vessels heat exchangers pumps compressors agitators.
The process flow diagram pfd represents a quantum step up from the bfd in terms of the amount of information that it contains.
Use rectangles to capture process steps like basic tasks or actions in your process. Flowcharts are usually drawn from top to bottom or left to right. Always put arrowheads on lines that reverse the typical direction. These diagrams represent the configuration and function of process plants and form integral parts of the complete technical documentation necessary for planning mechanical engineering erecting managing commissioning operating maintaining and decommissioning.