Revised Standard from Last Update.

NATIONAL FOREWORD

The Indian Standard (Part 5) (First Revision) which is identical with ISO 6974-5 : 2014 Natural gas - Determination of composition and associated uncertainty by gas chromatography — Part 5: Isothermal method for nitrogen, carbon dioxide, C1 to C5 hydrocarbons and C6+ hydrocarbons issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on recommendation of the Methods of Sampling and Test for Petroleum, its Products, Gaseous Fuels and Lubricants Sectional Committee and approval of the Petroleum, Coal and Related Products Division Council.

This standard was originally published in 2002 and was an adoption of ISO 6974-5 : 2000 ‘Natural gas - Determination of composition with defined uncertainty by gas chromatography — Part 5: Determination of nitrogen, carbon dioxide and C1 to C5 and C6+ hydrocarbons for a laboratory and on-line process application using three columns’. The first revision of this standard has been undertaken to align it with the latest version of ISO 6974-5 : 2014.

This Indian Standard is published in five pats. The other parts of this series are:

Part 1 Guidelines for tailored analysis

Part 2 Measuring-system characteristics and statistics for processing of data

Part 3 Determination of hydrogen helium oxygen nitrogen carbon dioxide and hydrocarbons up to C8 using two packed columns

Part 4 Determination of nitrogen carbon dioxide and C1 to C5 and C6 hydrocarbons for a laboratory and on-line measuring system using two columns

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker, while in Indian Standards, the current practice is to use a point (.) as the decimal marker.