Once the three-dimensional (3D) model has been established in piping design software like PDS, PDMS, or SP3D, Piping Designers/Engineers need to convey that information to the yard for fabrication and site for Construction. The transferred information must have to be sufficient for the fabricator with the vision of what is to be fabricated and how the piping should be connected with other elements, with exact dimensions and complete build/Bill of materials (BOM). This is where Piping Isometric Drawings play a magnificent role. So piping isometrics are directly used for the following situations:

For Construction Services

For marking up deviation during site modifications/ as-builting.

For reference as Stress Analysis model built up and final stress mark up for updating stress requirements.

Piping isometrics indirectly helps to calculate many parameters required during project execution like:

Inch Meter can be estimated as Length of pipe (in meter) x Size of pipe ( in inch )

Inch Dia is calculated as Size of Pipe joint ( in inch) x No, of Joints

Pipe Weight is calculated as π x diameter of the pipe (in m) x length (in m) x thickness (in mm) x density of pipe material. Density of CS = 7.85 g/cm3

The volume of Water required for hydro testing is estimated as π x {Pipe ID (in meter)}² x Length of Pipe

Insulation Area (in m²) can be found as [π(Pipe OD+ insulation thickness)] (all in meter) x Length of Pipe (in meter)

By definition, Isometric drawings are a pictorial representation that combines height-width-depth/length into a single view with 30 degrees from its horizontal plane as shown in the below attached image.