• Most gas transmission companies have a Hydrocarbon Dewpoint (HCDP) specification that ensures that no free hydrocarbon liquids accumulate in their pipeline. Several processes are available, including:
    • Joule-Thompson (JT) auto-refrigeration
    • Mechanical Refrigeration with electric motor or gas engine driven refrigeration compressor(s) (see picture below).
    • Short cycle desiccant (silica gel) plant - see 2 Tower Open Cycle Hydrocarbon Recovery Unit (2TOC HRU) beside.
  • Gas composition, the HCDP specification, the market for the hydrocarbon liquids removed, the ambient conditions and the availability of utilities all contribute to the selection of the best process for a particular application.
  • Also see LPG Recovery.