NATIONAL FOREWORD

The Indian Standard (Part 3) (First Revision) which is identical with ISO 6973-3 : 2018 ‘Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 3: Precision and bias’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on recommendation of the Methods for Sampling and Test for Petroleum and Related Products of Synthetic or Biological Origin including Lubricants, Greases, Speciality Products, Additives and Gaseous Fuels (excluding Bitumen) Sectional Committee and approval of the Petroleum, Coal and Related Products Division Council.

This standard was originally published in 2002 as an adoption of ISO 6974-3 : 2000 ‘Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 3: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and hydrocarbons up to C8 using two packed columns’. The first revision of this standard has been undertaken to align it with the latest version of ISO 6973-3 : 2018.