Keywords: Fuels; Gas analysis; Gaseous fuels; Chemical analysis and testing; Gases; Natural gas ; Sampling methods; Sampling equipment; Test equipment; Test specimens; Flammability; Cleaning ; Statistical methods of analysis; Statistical distribution; Safety measures; Gas flow; Condensation; Unalloyed steels; Stainless steels; Epoxy resins; Coatings; Polymers; Pressure; Compatibility