Pig 03 : (1) A container, usually lead, used to ship or store radioactive materials. See: Cask, Coffin. (2) A device forced through a pipeline by hydraulic pressure used to clean pipe
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}