Tension force in a fluid coupling
I'm making a swivel joint in a pressurized air hose. I'm 99% sure that when it's under pressure, there will always be a tension on the joint of static pressure * flow area, but *someone else* is insisting that this doesn't apply if the air is flowing freely though the hose, only if the end is stopped. Fluids engineering was my weakest subject in school and that was over 10 years ago, so I'm trying to find an objective source to back me up to satisfy *someone else*. I've already done a good bit of online searching, maybe I'm not using the right search terms, or maybe it's just so obvious that nobody has a website devoted to it.
Now that I'm thinking more about it, the area to use is probably to the inside of the first O-ring seal so it's even higher force, but that's small potatoes.
-Harry