ICS 73.040                         PCD 07

Reaffirmed 2021

NATIONAL FOREWORD

This Indian Standard (Part 6) which is identical with ISO 5072 : 2013 ‘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 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 plays a major role in Lignite utilization areas.

The Committee has decided to adopt this international standard under dual numbering system and publish as IS 5062 (Part 6)/ISO 5072 : 2013 ‘Methods of tests for brown coals and lignites : Part 6 Determination of true relative density and apparent relative density’.

This standard is published in seven 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 by low temperature distillation

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

Part 5 Determination of acetone-soluble material (resinous substances) in the toluene-soluble extract

Part 7 Determination of humic acids (Under Preparation)

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’.

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.