Sheesh. PC indeed. I never heard of an issue coming up in the field when MPT and FPT are used to describe end connections... But never mind that, what about the humble "coupling". We could read PC issues into that fitting as well. And the sometimes short lengths of small diameter piping which are fitted together with couplings.
I recall a few years back after a Code Week in Las Vegas, sitting in an airplane with another member of this forum. The plane was ground stopped due to unfavorable conditions at the destination. To kill some time we got to talking about this type of issue and entertained ourselves for a few minutes by thinking of all the "normal to a vessel or piping engineer" terms and phrases that would have others thinking that we were being, well, "less than professional." Particularly when one has an interest in coke drums with "modified cylindrical support structures." Wait a minute! Is it ok to say "coke drum"? Somebody might think I'm a drug dealer!
Then again, I had another colleague a while back who made it a point every day to say something which if HR heard would get him fired.