Unlike most laboratories, EPTL provides a comprehensive data analysis of natural gas and liquified petroleum products. Analytes are reported in mol %, vol. %, and wt. % and provided with calculated specific gravity, compressibility factor, viscosity, molecular weight, and gross/net heating values in Btu/ft3 for both real and ideal gas. Additionally, phase diagrams are provided with every analysis for bubble and dewpoint prediction.

Phase diagram, redline is predicted bubble point and blueline is dewpoint. Interpreted as, if this mixture was at 500 psia of pressure, it would exist completely as a liquid at temperatures less than -150F (left of redline) and as a gas at temperatures greater than 150F (right of blueline). Center of phase envelope can be used for extrapolation of percent liquid/gas ratios.

EPTL’s standard gas or LPG analysis contains the following analytes

  • Nitrogen
  • Carbon Dioxide
  • Methane
  • Ethane
  • Propane
  • Iso-butane
  • N-butane
  • Iso-pentane
  • Hexanes, Heptane, Octanes, or Nonanes+
  • Helium
  • Hydrogen
  • Oxygen
  • Carbon Monoxide
  • Argon
  • Neon
  • Krypton
  • Xenon

EPTL provides the most extensive detailed hydrocarbon analysis available, with 166 compounds reported through dodecane+, individually grouped as paraffins, isoparaffins, aromatics, naphthenes, and olefins (PIANO). The detailed hydrocarbon analysis can be provided on any hydrocarbon matrix: gas, LPG, natural gasoline, crude, refined products, and even water/solid matrix. Calculated properties such as specific gravity, molecular weight and heating values are provided.

PIANO analysis of refined unleaded gasoline

If a detailed hydrocarbon analysis is not required EPTL provides the advantage of a grouped hydrocarbon analysis for product characterization. Additionally, results can be provided up to C60+ for wax and asphaltene characterization in crudes. Additionally, a C60+ analysis is very beneficial for identifying and treating wax scale deposits.

C30 hydrocarbons in wax scale deposit

Identifying sulfur compounds is important, as H2S can cause corrosion and mercaptans can foul up production in plants and lead to undesirable sour hydrocarbon fuels. Detection limit is important for analysis, EPTL uses gas chromatography coupled with pulsed flame photometric detector for detection limits of 0.04 ppm mol. Concentrations are reported in ppm mol, ppmv, and ppm wt., coupled with total sulfur by compound. The following compounds are reported:

  • Hydrogen Sulfide
  • Carbonyl Sulfide
  • Methyl Mercaptan
  • Ethyl Sulfide
  • Dimethyl Sulfide
  • Carbon Disulfide
  • Isopropyl Mercaptan
  • Tert Butyl Mercaptan
  • N-Propyl Mercaptan
  • Ethyl Methyl Sulfide
  • Sec-Butyl Mercaptan
  • Thiophene
  • Isobutyl Mercaptan
  • N-Butyl Mercaptan

0.64 ppm wt. carbon disulfide in waste refinery gas