煤和焦炭 机械采样 第3部分：从静止煤堆中采样

[中文适用范围]： 本文件规定了从静止批次（例如，货车、驳船、船舶和堆垛）中机械取样的程序。这些程序用于无法按照ISO 13909-2在装载或卸载过程中对批次进行取样的情况。样品制备程序在ISO 13909-4中给出。本文件适用于从静止煤炭批次中机械取样，以获取样品，从中可以根据ISO 13909-4中规定的要求和建议制备用于测定水分以及用于一般分析（包括物理和化学测试）的测试样品。在本文件中，给出了设计取样方案的原则和程序，以及应用的典型示例；此外，还描述了在不同取样情况下执行取样的实践。所描述的方法仅限于可以进行偏差测试的方法。 [外文原描述]： This document specifies procedures for the mechanical sampling of coal from stationary lots, for example, from wagons, barges, ships and stockpiles. These procedures are to be used when it is not possible to sample the lots during loading or discharge according to ISO 13909-2. Procedures for sample preparation are given in ISO 13909-4. This document is applicable to mechanical sampling from stationary coal lots, to obtain samples from which test samples for the determination of moisture, and for general analysis including physical and chemical tests, can be prepared in accordance with the requirements and recommendations set out in ISO 13909-4. In this document, the principles and procedures for designing a sampling scheme are given, together with typical examples of applications; in addition, practices for the execution of sampling in different sampling situations are described. The methods described are limited to those on which it is possible to conduct a test for bias.