1. Scope

1.1 This practice covers procedures for obtaining a manual gross sample from beneath the surface of coal in railroad cars, barges, trucks, or stockpiles. These procedures are to be used to provide gross samples for estimating the quality of the coal. The gross samples are to be crushed, divided, and further prepared for analysis in accordance with Practice D 2013.

1.2 This practice provides instruction for sampling beneath the exposed surface coal to a depth of approximately 61 cm (24 in.). Samples are collected at this depth to get below the surface of the material, where drying and oxidation may have occurred. The purpose is to avoid collecting increments that are significantly different from the majority of the lot of coal being sampled due to environmental effects. The user is cautioned that samples so obtained do not represent material beyond the point of penetration. Sample increments collected from the surface layer(s) of coal in railroad cars, barges, or stockpiles are classified condition 'D' (see Practice D 2234 section 6, Increment Collection Classification). It is a good practice to require that 'details of sampling procedure shall be agreed upon in advance by all parties concerned' whenever collection of sample increments falls under condition 'D.' This practice offers a sampling procedure that parties may use to meet requirements of Practice D 2234 for condition 'D.' The practice does not produce samples that satisfy precision requirements of Practice D 2234 general-purpose sampling, or Practice D 2234 special-purpose sampling.

1.3 The user is cautioned that samples of this type do not satisfy the minimum requirements for probability sampling and as such cannot be used to draw statistical inferences such as precision, standard error, or bias.

1.4 This sampling method is intended for use only when sampling by more reliable methods that provide a probability sample is not possible.

1.5 The quantities stated in either acceptable SI units or in inch-pound units are regarded separately as standard. The quantities stated in each system may not be exact equivalents; therefore, each system must be used independently of the other, without combining quantities in any way.

1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D121 Terminology of Coal and Coke

D2013 Practice for Preparing Coal Samples for Analysis

D2234/D2234M Practice for Collection of a Gross Sample of Coal

D4749 Test Method for Performing the Sieve Analysis of Coal and Designating Coal Size

D4916 Practice for Mechanical Auger Sampling

E105 Practice for Probability Sampling of Materials

E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods

E456 Terminology Relating to Quality and Statistics

Keywords

barges; manual sampling; rail cars; railroad cars; stockpiles;

ICS Code

ICS Number Code 73.040 (Coals)

DOI: 10.1520/D6883-03

ASTM International is a member of CrossRef.