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Diaphragm valve

I'm guessing Snickster's answer is correct. Don't forget the pipe insulation. It could be 1.5" to 3" thick.

First obvious question: what is the brand and model number for the check valve?

The question seems to be, "Can I join together pipes of two different diameters with a reducer".

So, if a Large Language Model finds that the majority of resources scanned say that 2+2=7, the ChatGPT AI will report that 2+2=7?

"Ullage is the volume which is left empty in a tank so that there is space for the liquid in the tank to expand."

"TELETRAVAIL" translates to "distance work"; is it possible this file is on a remote server intended for work-from-home?

From my refinery drawing office days many years ago a jumpover was a piping interconnection requested by operations in order to push product somewhere not originally intended.

This is what you are referring to?

"Buy a reducer" Yeah, not to mention availability of fittings and valves in 28", as 1503-44 mentioned.

Keep in mind that PDMS and SmartPlant (or whatever they're being called these days, gotta keep rebranding so no one knows what you're talking about) are in a completely different league from the other two.

Are we all talking about the same terms or am I misunderstanding? This image shows a flanged 'pipet' that does save some welding: See http://wfi-intl.com/index.php?page=flanged-pipet-2

I've seen this specified as being equivalent to the pipe wall thickness.

Ah, yes, air vent makes more sense than angle valve if that is a pump suction.

AV = Angle (control) Valve, I presume. Odd thing that now that P&IDs are always CAD you often find weird symbols. Is it because lesser-experienced people are now doing drawings or using only symbols that came in the box with the software?

If the overall length of 11.5" is fixed it will be difficult to use off-the-shelf fittings unless maybe slip-on flanges welded to a reducer.

Are the flanged connections insulated?

That looks like a knife gate, often used in pulp and paper.

Sure! Are you selling it?

There are LOTS of things that are done differently now that CAD has taken over, the old timers are retired or gone and software often dictates how things get done.