P&I Diagrams in Pre-planning

P&I diagrams are part of the plant documentation. As standard, P&I diagrams are used for the following:

Representation of a process engineering piping
Representation of a plant overview with associated instrumentation
Functional overview drawings of machines.

P&I diagrams are often called P&IDs (Piping and Instrumentation Diagrams) or P&I schemes (Piping and Instrumentation Schemes). The term "P&I diagram" is used in EPLAN.

Information in a P&I diagram

The information in a P&I diagram is split into basic information and additional information. Basic information is:

Functional purpose and type of the apparatus and machines, including engines, conveyor equipment and installed reserves
Identification number of the apparatus and machines, including engines
Characteristic sizes of apparatus and machines
Pipings with designation of nominal width, pressure level, material and version, e.g. via a piping number and piping class or identification number
General information on the apparatus, pipings, and control valves
Measurement, regulation, and controlling functions with identification numbers
Characteristic information about engines.

The P&I diagram can also contain the following additional information:

Designation, flow rate, and quantity of energy and energy carriers
Flow paths and directions of energy and energy carriers
Type of important devices for measuring, control, and regulation processes
The main materials of apparatus and machines
Platform height and approximate vertical position of the part sections
Reference identification of control valves
Designations of part sections.

Page Type "P&I Diagram"

P&I diagrams are created on pages of page type "P&I diagram". The origin of the pages is at the lower left. When changing standards, these pages are never rotated.