Refillable seamless steel gas cylinders - Specification: Part 2 quenched and tempered steel cylinders with tensile strength less than 1 100 mpa (112 Kgf/mm²) (Fourth Revision)
Natural gas - Determination of composition with defined uncertainty by gas chromatography: Part 3 determination of hydrogen, helnavi, oxygen, nitrogen, carbon dkixide and hydrocarbons up to c8 using two packed columns