This question has been bothering me for a while now.

What is the best possible way to approach, the bulk material take off at proposal stage?

A] To have a listing of valves and other fittings excluding pipe and elbows and covering the rest using the bulk and spare philosophy.

B] Creating isometric sketches based on piping studies and then calculating the bulk.

C] Using software to create preliminary stage 3D model instead of option B. However, the setup may prove cumbersome.

Kindly advice the best foot forward. I’ve merely stated what I thought. Any suggestions on information, books and specialized softwares for proposal are most welcome.

Regards,