Need a little help on this one. I working on a review/design of a large bore flange for a duct. I'm looking at a hubless slip-on arrangement like an AWWA pattern flange and I'm trying to use the Caesar flange analysis tool to help with checking it out.

I'm having some trouble figuring out which one to use. I think the "Loose Ring" choice looks like the right one graphically. But, when I select it, it still calls for inputs for the hub parameters. The integral ring graphic looks the same as well. Also, when I think of a ring flange, I'm expecting it to refer to a ring type gasket.

I just want to verify that the "Loose Ring" style is the one I want to use in this case. Or, for that matter, if this tool will even review this style of flange.