Symbology – the symbols used on each isometric should be industry standard clear, concise and consistent no matter how many different people draw them or what CADD system is used.It is better to use two or more sheets for a line than to try to 'Save paper and crowd so much on one sheet and end up with errors in fabrication. The key here is clear communication from the office to the shop and the field. This should be one line or part of one line. The configuration – Presented in a clear and simple manner that the shop and field can understand.The recommended North direction is up and to the right. As much as possible all Isometrics should be drawn (Plotted) with the North Arrow in the same direction. A North Arrow – indicating the direction of Plant North (for projects on land) or Platform North (for projects that are Offshore Platforms).The Graphic Section should include the following when applicable: Heat tracing criteria – Type, Temperature, etc.

Post Weld Heat Treat (PWHT) requirements – from the line list.

Hydro-Test Pressure – from the Line List.

A designation of Shop or Field fabrication – Design instructions.

The Insulation Type – from the line list.

The Piping Code applicable to the line – from the line class specification.

The Technical Data section Block section is further broken down to include:

The name of the person creating the line/isometric.

Sheet Number – When a pipe line takes more than one sheet then there needs to be a way to identify each sheet in the Isometric log.

The part that is used for drawing identification is only the numeric sequence number and the Line Class specification. Only part of the line number is included as the 'Drawing Number' for the isometric. The line number comes from the P&ID and the Line List.

The Line Number – The Line Number becomes the drawing number for the isometric.

The identification or title block section is further broken down to include: The 'isometric drawing' form is divided into sections for the required information. In order to accomplish this there must be certain specific information included in or on the isometric drawing. Definition: A piping 'Isometric' is a three dimensional representation of a pipe line or part of a pipe line complete with all information necessary to purchase (the material), fabricate, install and test the line or part of the line.

Isometric piping drawing techniques