ISO 13909-3:2016

Overview

ISO 13909-3:2016 - "Hard coal and coke - Mechanical sampling - Part 3: Coal - Sampling from stationary lots" specifies standardized procedures for mechanical sampling of coal when lots are stationary (for example, in wagons, barges, ships and stockpiles). It is intended for obtaining representative samples that can be prepared for moisture determination and general physical and chemical analysis in accordance with ISO 13909‑4. The methods are restricted to sampling approaches for which a bias test can be performed.

Key Topics and Requirements

• Scope of application: Mechanical sampling from stationary coal lots (wagons, barges, ships, stockpiles).
• Sampling scheme design: Steps for defining quality parameters, lot boundaries, sampling interval and scheme layout (sub‑lots and increments).
• Precision and variance: Discussion of required precision, total variance components (primary increment variance and preparation/testing variance), and guidance to determine number of sub‑lots and increments.
• Minimum sample mass and increment mass: Requirements for minimum sample mass and for average primary increment mass to limit bias.
• Execution practices: Recommended procedures for taking, distributing and handling increments from wagons, barges, ships and stockpiles; use of mechanical augers and appropriate equipment.
• Sample handling and preparation: Cross‑reference to ISO 13909‑4 for sample preparation; storage and handling to avoid alteration (especially moisture).
• Bias minimization and verification: Identification of bias causes, measures to minimize them and methods to check precision and bias (see ISO 13909‑7 and ISO 13909‑8).
• Limitations: Applies only to methods where bias testing is possible.

Practical Applications and Users

Who uses ISO 13909-3:2016:

• Coal producers and traders for commercial sampling and quality verification
• Port and terminal operators sampling wagons, barges and ships
• Mine and stockpile operators for routine quality control and process monitoring
• Laboratory managers preparing test samples for moisture, proximate and ultimate analysis
• QA/QC and metrology personnel implementing traceable sampling plans

Practical benefits:

• Ensures representative, reproducible sampling for contractual quality disputes and regulatory reporting
• Reduces sampling bias and quantifies precision so users can set defensible acceptance criteria
• Provides a consistent framework for sampling across different stationary lot configurations

Related Standards

• ISO 13909-1: General introduction
• ISO 13909-2: Coal - Sampling from moving streams
• ISO 13909-4: Coal - Preparation of test samples
• ISO 13909-7: Methods for determining precision
• ISO 13909-8: Methods of testing for bias

Keywords: ISO 13909-3:2016, mechanical sampling, coal sampling, stationary lots, wagons, barges, ships, stockpiles, sample precision, sampling bias, sample preparation.