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Can we use the O-Ring Flange with standard PVC pipe?

I am thinking in buying the O-Ring Flange and dome end cap that are available on BR store in order to close my ROV tube which is in PVC.

So my first question is regarding the tolerance on the internal diameter of the PVC tube. For instance, with a 4" O-Ring Flange to work, what is the minimum and maximum diameter of the tube that can fit with the flange while preserving the watertight?
If you don’t have this number for the flange, I would be happy with the tolerance on the internal diameter of your acrylic tube! Looking at the technical details of the aluminium tube, I see that it has an internal diameter of 100.65 +0.15/-0.05 mm. Is it the same for acrylic? Does this tolerance can be relaxed? How does it compare to the tolerance on a standard PVC pipe?

My second question is regarding the quality of the internal suface of the tube. When I looked the documentation and videos about WTE assembly, I noticed that it is mentioned several times that the surfaces must be clean, without any scratch or dust, in order for the sealing to be waterproof. Although it was not clear to me if the surfaces that are mentioned were the surface of the tube, the surface of the o-ring or the surface of the flange, I am wondering if the internal surface of a standard PVC pipe bought in a classical store has the required quality in order for the sealing to be efficient?

Thanks for the help!


The ID if the 4" acrylic tube is the same as the aluminum (or as close as it can be with cast acrylic). Because it is cast acylic, the ID sometimes goes in and out so we test fit the tubes. Our technicians are looking for a consistent 1-2 mm of o-ring mate all the way around. If there is a break in the seal, the tube is thrown out.

I think about the only way to really test that on PVC is to do a vacuum seal test and then if that works try lowering it down to your operational depth without electronics inside and see if it leaks.

We haven’t tested our flanges on PVC, so you are a bit into unknown territory.

Ok, thanks for the answer!
So I’ll try and I’ll let you know it works or not!