The first versions of various bills of materials (BOM) and material take-offs (MTO) including process, piping, electrical and structural are develop during the FEED stage.
These BOMs and MTOs are used for developing high quality project cost estimates and developing firm, fixed price quotations for the detailed engineering and fabrication stage of the project.
Preliminary piping material take-offs can be conducted at any stage of the FEED process. This is done by doing preliminary pipe route studies and extracting the material lists from the program. This program is resident within the AutoDesk Plant 3D program.