This sounds reasonable, but seeing that we've already separated these virtual pipes, I can calculate that we have over 13 miles of virtual pipe in our system that is associated with tanks. That's from about 200 miles total. That ends up being pretty significant if ignored, or factored into the overall real piping that needs to be managed.
I'm still deciding on whether to keep our virtual edges in the UN or use associations, but at least for us, it's not trivial to ignore, which is why we undertook creating them in the first place. I was just curious what others are doing. Anyway, thanks for the feedback!
cheers, Gavin