Misa,

The critical path is NOT the time to model the data. It is getting data in the first place. To get the interfaces to work as the book intends, you need data in the PDS/PDMS model which means lines need to be complete and with pipe supports located. Most times in order to prove a design is adequate in principal and to avoid the situations above, you only need rough "scaled" dimensions which are quite close enough for 99% of pipe stressing. I am not against 3D, only that stressing should be done before the model is fully detailed. Then again, its the same rate for doing a job the second time as it was the first.