Piping Isometric Drawings

Piping Isometric Drawings:

Piping isometrics are three dimensional representations on a drawing sheet. An isometric drawing covers a complete line as per the line list connecting one piece of equipment to another. It should show all information necessary for the fabrication and erection. ISO are not drawn to scale but should be proportional for easy understanding. Dimensions are given relative to center line of piping.

Should include the following

1.    Plant north

2.    Dimensions & angles

3.    Ref number of P&ID, GA drawings, line numbers, direction of flow, insulation and tracing.

4.    Equipment location and equipment identification.

5.    Nozzle identification on the connected equipment.

6.    Size and type of valve / direction of operation.

7.    Size and number of control valve

8.    Location & orientation and number of each equipment.

9.    Field weld

10. Location of high point vents & low point drains

11. Bill of material

12. Requirements of stress relieving seal welding, pickling, coating, etc.