I have a model which has some piping aboveground & some underground. I modeled the piping & used the buired modeler to put the soil details for the underground portion. After running the model I got a file with B attached.
Should the further analysis to put the restraints on the Aboveground portion be done on this file. Or i have to use the original file.

when is the original file used again during the analysis

Your assumption is correct. Further modifications should be made to the "B" file.

We always modify the file without the B and keep it as the master, then rebury it . Otherwise if you have to now change something in the buried piping and then rebury it again it becomes a BB file and you end up with lots of supports on the underground piping. It can become very messy.

I agree that modifications to a buried system is best made to the original, unburied, system.

One exception is additional restraints. If you want to add your own underground restraints (e.g. anchor flanges), they must be added to the buried system as CAESAR II removes all user-entered restraints before it adds its own, program-generated soil restraints (in the buried sections).

Related buried pipe, I have buried pipe for all section which anchored at both ends. The anchors are buried too.I inputed soil model, and Caesar coverted it. I did not know why the anchor restraints changed as Caesar converting result. And, analysis result had no stess due to thermal expansion. But, if I changed anchor sections to buried bends, overstress occured at that section.

The objective of the model is to analysis stress happens in buried pipeline due to thermal expansion (difference of installed-operated).

Sharing of expeciences and advice are very appreciated

Agung C

When re-meshing the buried portions of a model, CAESAR II removes all user defined restraints. This is so that the computed bi-linear restraints can be applied. If however, you have known anchors, you should redefine them in the buried model, at the proper locations.