Design Pipeline

My first thought is that the mechanical or piping engineer should be able to figure this out. That's part of the design exercise that should happen so that the plans can be reviewed and approved by the various authorities. There are codes and requirements that we don't know, since we don't even know where you are.

This is not something that can be done over the internet by an anonymous forum.

Hire a consultant.

You've just given a blind man a loaded gun.

Now, let's spin him around a few times and let him go.

Now you don't really think this kid is in charge of anything other than graduating this semester, do you?

Let's hope not.

a 20 foot diameter pipe? 5 feet, what? what is the pipe made of clay, abs, stainless? we can't read minds here

Here ya go. Don't forget to attach this to your calculations.

"... information on how to determine the collapse pressure pipeline under vacuum? ..."

You probably have figured too:

There just is more than a distant answer-

although, say, you may calculate a particular value for material to pipe wall thickness to pipe size and add-up some of many differential factors of pressure-to-"vacuum" effects

As L states, there are probably local engineering considerations and those that can really help with required local building safety factors too, to other codes -, of which PERHAPS someone officially, ? an inspector will approve for you if you go through all their expected and wanted about needed completed engineered layouts and design to implementation