Hi,

I was doing analysis in version 5.2.
For some reason I converted that file to neutral file & re opened it in version 5.1.

To my surprise I found out that pipe is failing after I converted it to lower version.

Also load case definition & parameters like water depth were getting deleted from converted file.

Can anyone advice me on this?

I was unable to understand why model fails if you convert it to lower version.

Regards,
Kaustubh

Check the front of the User Guide, there is a list of changes made to the software that could lead to different results, based on your specific model and piping code.