I work in construction and once worked on a UPS sorting facility. They don't x-ray and the packages are traveling most of the time on conveyor belts. The real problem you could run into is if your package gets caught on the belt and the label is mangled or ripped off. Then they go through the package to try to find out who to ship to or who sent it. The solution for this is to wrap your package with the address attached inside the shipping package. I got pot through the mail for years this way with no problems before that connection died out. I would NOT carry the pipe on you through the airport, I would be afraid of dogs and, of course, a metal pipe would be right out! But, I found when I went to Hawaii, that they seemed to be looking more when leaving then when arriving.
if you are going to put them though luggage check.... just spray some of that stuff that people use to keep their dogs off their furniture, and spray your shit down GOOD.. like REALLY good. i think this might work... but im not sure... good luck!