IS 5062 : Part 6 : 2025/ISO 5072 : 2021 Brown Coal and Lignite - Methods of Test - Part 6 Determination of True Relative Density and Apparent Relative Density

ICS 73.040

PCD 07

NATIONAL FOREWORD

This Indian Standard (Part 6) (First Revision) which is identical to ISO 5072 : 2021 'Brown coals and lignites - Determination of true relative density and apparent relative density' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Solid Mineral Fuels and Solid Biofuels Sectional Committee and approval of the Petroleum, Coal and Related Products Division Council.

Relative density of the coal depends on the rank of the coal and degree of mineral impurity. Its determination has major applications in finding out the quality of lignite, estimation of reserve, handling, design and also plays a major role in lignite utilization areas.

This standard was first published in 2017, as adoption of ISO 5072 : 2013 'Brown coals and lignites - Determination of true relative density and apparent relative density'. This revision has been brought out to align it with the latest version of ISO 5072 : 2021 'Brown coals and lignites - Determination of true relative density and apparent relative density', with revised title as 'Brown coal and lignite - Methods of test: Part 6 Determination of true relative density and apparent relative density'.

The major changes in this revision are as follows:

a) referenced documents have been updated;

b) terms and definitions have been added;

c) sample has been added;

d) calculation and expression of results have been amended;

e) precision has been amended; and

f) test report has been amended.

This standard is published in eight parts. Other parts in this series are:

Part 1 Determination of moisture content by the direct volumetric method

Part 2 Determination of ash

Part 3 Determination of the yields of tar, water, gas and coke residue by low temperature distilation

Part 4 Determination of yield of benzene-soluble extract - Semi-automatic method

Part 5 Determination of acetone-soluble material (resinous substance) in the benzene-soluble extract

Part 7 Determination of humic acids

Part 8 Determination of moisture content

Sec 1 Indirect gravimetric method for total moisture

Sec 2 Indirect gravimetric method for moisture in the analysis sample

The text of ISO standard has been approved as suitable for publication as an Indian Standard without deviations. Certain 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'; and

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.