ISO 13909-3:2016规定了从固定批次（例如货车、驳船、船舶和堆料）机械取样煤炭的程序。根据ISO 13909？2:2016，在装货或卸货期间无法对批次进行取样时，应使用这些程序。ISO 13909-4:2016中给出了样品制备程序。 ISO 13909-3:2016适用于从固定煤炭批次中进行机械取样，以获得样品，从中可以根据ISO 13909？4:2016中规定的要求和建议制备用于测定水分和进行一般分析（包括物理和化学试验）的试样。 ISO 13909-3:2016中给出了设计抽样方案的原则和程序，以及典型应用示例； 此外，还描述了在不同采样情况下执行采样的实践。所述方法仅限于可以进行偏差测试的方法。

ISO 13909-3:2016 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？2:2016. Procedures for sample preparation are given in ISO 13909？4:2016. ISO 13909-3:2016 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？4:2016. In ISO 13909-3:2016, 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.