Double Flange - Tube Connector


We are currently working on an underwater glider and need to connect two tubes. For that, we had the idea to manufacture a “double flange” (basically a mirrored normal flange, we’re using 6-inch tubes). I have a few questions about that:

Are there any specific tolerances (for the manufacturer) we have to keep in mind to have a good fit with the tube?

The metric dimensions of your 2D drawings don’t match up 100% with the CAD-Model, so I guess I should design our solution after the CAD-Model?

Last thing: According to the Parker O-Ring guide one should use a 433 O-Ring for 6-inch bore diameter, but you are using a 432? I’m sure there is a good reason for it, it just got me confused.


Hi @sibauer, welcome to the forum :slight_smile:

I’m not certain on any of your three questions, so I’ve asked our lead enclosure design engineer to respond.

I don’t yet have an official response on the flange manufacturing tolerances and dimensional accuracy, but I’m told some of our public drawings and CAD models may be inaccurate by design, to help prevent copying and underselling using our design work.

If that’s the case here then presumably it’s at least accurate for the interfacing aspects (e.g. mounting hole sizes and locations), but may be approximate for the other dimensions.

It’s been pointed out to me that this has been responded to previously :slight_smile:

Did you have any luck with a double flange? I’ve got a similar tow application where need two sections - one water tight and another to secure cables and a dredge. Would like to collaborate if possible.