Principles and Concepts

The following points should be observed when drawing P&IDs:

• Label all instruments, equipment, pipes, bypasses, spec breaks as fully as possible.

• All Pipe On/Off flags should be labelled.

• Do not forget to label reducers in labelled pipes.

• Always make sure when editing a P&ID that the AS_NONPLOT layer is On. Stretching, moving or editing the drawing with this layer Off will compromise drawing integrity and may inadvertently leave Start or End nodes online labels in the wrong position. Do not stretch pipes with the NON PLOTTING layer turned Off.

• Always use the correct symbol. Incorrect symbols will be seen as a different item to the one intended in the validation. If the correct symbol is not available, a new one should be made.

• Some LISP files contain AutoCAD commands and therefore should not be used. Consult AVEVA P&ID technical support for guidance on this subject. Make sure that all nozzles are associated with equipment items.

• Equipment items should be used for the purpose intended, or pipe source and destination information will be lost during the AVEVA P&ID load.

• Where appropriate Process Links should be used instead of pipes for the case where a branch does not need to be labelled, or a connection to an off-line instrument is required.

• Colours: (these comments are subject to whatever project configuration has been setup)

  • If the project has configured in-line items to be the same colour as the pipe then items which are not the same colour as the pipe they are associated with have been incorrectly inserted.

  • Line fittings should be the same colour as the pipe they were inserted into. If they are not, the symbol has not been inserted correctly the first time or was created on that P&ID.

• Do not place symbols between start and end nodes, or they will not appear in a pipe for any subsequent export of data.

• Process links can be created in any available pipe style defined for the project. Take care to make sure that only branches that are not being labelled are created using the Process Link option in the Pipeline group of the Home tab.

• Avoid cross associated labels between pipes, for example, place the label on the pipe which possesses the associated start and end nodes. Use the Show Associations between Items procedure to determine the association.

• Always use destination text if a pipe does not end at a symbol, e.g. if it is expelling steam to the atmosphere or connected to a package item.

• Prepare drawing borders at the start of a project in the required drawing sizes and initialize AVEVA P&ID on them, so that when new drawing are created the application will start-up automatically.

• Always be aware of the sequencing in the pipe labels, especially when adding reducers.

• Drawing numbers and offsheet connector labels should not have spaces in them.