The Collaborative International Dictionary of English v.0.48:

Pipage \Pip"age\, n.
   Transportation, as of petroleum oil, by means of a pipe
   conduit; also, the charge for such transportation.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pipage
    n 1: a fee charged for the use of pipes
    2: a long tube made of metal or plastic that is used to carry
       water or oil or gas etc. [syn: pipe, pipage, piping]