ISO 13909-8:2016 無煙炭とコークス—機械的サンプリング—パート8：バイアスのテスト方法 | ページ 2

Foreword

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The committee responsible for this document is ISO/TC 27, Solid mineral fuels, Subcommittee SC 4, Sampling.

This second edition cancels and replaces the first edition (ISO 13909-8:2001), which has been technically revised.

ISO 13909 consists of the following parts, under the general title Hard coal and coke — Mechanical sampling:

• 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 6: Coke — Preparation of test samples
• Part 7: Methods for determining the precision of sampling, sample preparation and testing
• Part 8: Methods of testing for bias

Introduction

It is not possible to lay down a standard method for field work by which a sampling procedure can be tested for bias because details of the procedure will inevitably be affected by local conditions. However, certain principles can be specified which ought to be adhered to whenever possible and these are discussed in this part of ISO 13909.

Testing for bias can be a tedious and expensive process. All bias tests therefore include a thorough pretest inspection, with appropriate action taken regarding any system deficiencies likely to cause bias.

1 Scope

This part of ISO 13909 sets out principles and procedures for testing the bias of test samples of hard coals or cokes, taken in accordance with other parts of ISO 13909.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 13909-1 apply.

Bibliography