Does anyone know these flanges?

Hi,

To me they look very similar to some form of Compact flange, which I've used for Offshore design, mainly a space saving flange used when Subsea meets Topsides, via a Caisson, also seen them on equipment, again allows for closer knit arrangement etc.

Not sure if that helps.

It sure helps, thank you.

I still haven't found the type of this flange but it puts me in the right direction. It is now clear to me that this must be a kind of compact flange.