This is closely related to the question Tags [pipe] and [pipes] should be synonyms, which has been resolved since October 2011 — those two tags are synonyms.
However, there is another closely related tag, piping, that should also be a synonym of pipe. There are about 347 questions with the tag piping (compared with 6,370 with the tag pipe). Many of the top users have only answered one question in the tag — I've answered 8, it seems, but I wasn't even aware of the tag's existence until someone pointed it out to me.
I've created a synonym proposal that [piping] should be a synonym of [pipe]. Please cast your votes in favour.
