Revised Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (Part 6) (First Revision) which is identical with ISO 13909-6 : 2016 ‘Hard coal and coke - Mechanical sampling - Part 6: Coke - Preparation of test samples’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on recommendation of the Solid Mineral Fuels and Solid Biofuels Sectional Committee and approval of the Petroleum, Coal and Related Products Division Council.

The standard (Part 6) was first published in 2014 which superseded IS 436 (Part 1/Sec 2) : 1976 ‘Methods for sampling of coal and coke: Part 1 Sampling of coal, Section 2 Mechanical sampling’ and IS 436 (Part 2) : 1965 ‘Methods of sampling of coal and coke: Part 2 Sampling of coke ( revised )’. The first revision of this standard has been undertaken to align it with the latest version of ISO 13909-6 : 2016.

The major changes in this revision are as follows:

a) Normative references (2) have been updated;

b) Fig. 2 (a) and (f) for rotating disc and plate type dividers have been incorporated;

c) Clauses 6.2.3 and 6.2.4.1 have been modified;

d) Preparation of samples for specific tests (7) and the corresponding Fig. 6 have been modified; and

e) Normal operation (8.4.3) has been included.

This Indian standard is published in eight parts. The other parts in this series are:

Part 1 General introduction

Part 2 Coal - Sampling from moving streams

Part 3 Coal - Sampling from stationary lots

Part 4 Coal - Preparation of test samples

Part 5 Coke - Sampling from moving streams

Part 7 Methods for determining the precision of sampling, sample preparation and testing

Part 8 Methods of testing for bias

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.