Piping isometric is a representation of a single pipe line in a process plant with exact dimensions and Bill of Material (BOM). This kind of drawing helps a designer to transfer his vision of piping connections to the team executing construction projects. Here comes the role of Piping Isometric drawing.
So that, they can understand well and get a vision of the fabrication of Spools and how the piping is connected with other equipment or special items. The conveyed information must be enough for the execution person. After establishing a 3-D model in PDMS, SP3D, or any other software, Piping designers have to communicate the same information to the person who is executing that piping job either in the yard for fabrication or in the field for Erection/Construction.