The volume of Water required for hydro testing is estimated as π x ² x Length of Pipe.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.Inch Dia is calculated as the Size of the Pipe joint ( in inch) x No, of Joints.Inch Meter can be estimated as the Length of pipe (in meters) x Size of pipe ( in inches).Piping isometrics indirectly helps to calculate many parameters required during project execution like: For reference as Stress Analysis model built up and the final stress markup for updating stress requirements.For marking up deviation during site modifications/ as-builting.Video Tutorial of Basics of Piping Isometric Drawing.Online Video Courses on Piping Isometrics.Example of length calculation in Piping Isometric.