Many years ago I wrote an HP41C program to calculate pipeline routing parameters. I was pleased with it until I realised that simple 2D CAD software (e.g. Autosketch) was a better tool.
There are numerous CAD packages available today. We use an open-source 2D CAD product called QCAD. It’s a powerful tool and excellent for most of our applications (e.g. field development layouts, pipeline routing studies, etc).
Download it here and try it.