• Hydrocarbon gas – containing only Carbon [C] and Hydrogen [H] molecules. The following are also known as ‘Alkanes’:
C1 – Methane [CH4] C2 – Ethane [C2H6]
C3 – Propane [C3H8] C4 – Butane [C4H10]
C5 – Pentane [C5H12] C6 – Hexane [C6H14]


  • Natural Gas – Primarily C1 & C2
  • Natural Gas Liquids [NGLs] – condensed liquid of primarily C3+
  • Associated Gas (Flare Gas) – gas that sits on top of an oil volume that is released during oil recovery operations
  • NOx – In Atmospheric Chemistry, NOx is a generic term for oxides of Nitrogen
  • Y-Grade Gas – also called mixed NGLs or ‘raw make’ is an unfractionated blend of the various purity products that make up the NGL product family
  • C2+ – Gas mixtures excluding Methane (C1) such as ethane, propane, butane, pentane and hexane
  • Sour Gas – Associated gas containing a quantity of Hydrogen Sulfide [H2S]
  • Sweet Gas – Associated gas that has been scrubbed of Hydrogen Sulfide
  • Synthesis Gas – Products of steam hydrocarbon reforming: H2, CO, and CO2
  • Reformate – name of the synthesis gas stream exiting the Heavy Hydrocarbon Reactor (HHR) after the reaction
  • Steam Generator (Boiler) – Packaged system that takes feedwater and creates high temperature and pressure steam
  • JT ( Joule-Thomson ) effect – Loss of temperature in a gas stream due to a pressure drop (volume expansion) over a valve or regulator
  • Designer Fuels – Fuels produced by the FTF/HDF family which are tailored to specific requirements such as BTU, Wobbe index or Methane number which ensure highest level of equipment performance
  • Blue Hydrogen – Blue hydrogen is produced from natural gas, with carbon capture and storage (CCS) technology scooping up the resulting CO2
  • MW – Megawatt  (1,000,000 watts)
  • SCFD – Standard Cubic Feet per Day
  • BTUH – British Thermal Unit per Hour