Hi Pilou,

> It's not possible first to test values and send an alert message and/or
> give a minimum thickness/Outer?

It's certainly possible, but since this script was made for Alex who is experienced with real life piping it just doesn't seem likely that he will be putting in those types of impossible parameters. If a lot of people continue to run into that problem then it would probably make sense at that time to do the extra work that you're talking about.

- Michael