Standard test method for total moisture in coal
This method covers the measurement of the total moisture in coal as it exists at the site, at the time, and under the conditions it is sampled. It is applicable to coals as mined, processed, shipped, or utilized in normal commercial pursuits. Exceptions are coal-water slurries, sludges, or pulverized products, or both, under 0.5-mm diameter sieve size. It is applicable to coals of all ranks within the recognized limitations imposed by oxidation and decomposition variations of lower rank coals. Because of its empirical nature, strict adherence to basic principles and permissive procedures are required for valid results. The standard is available to producers, vendors, and consumers as a total moisture method when other procedures or modifications are not mutually agreed on. Since coal can vary from extremely wet (water saturated) to completely dry, special emphasis must be placed on the sampling, sample preparation, and the moisture determination itself to ensure total reliability of measurement. Therefore, this standard is recommended entailing collection of the gross sample, sample preparation, and the method of determination. This method is based on the loss in weight of a coal sample in an air atmosphere under rigidly controlled conditions of temperature, time, and air flow. The gross moisture sample is air-dried to equilibrate it with the atmosphere at each stage of division and reduction. Final moistu determination is made in a heated forced-air circulation oven under rigidly defined conditions. The total moisture is calculated from losses (or gains) in air-drying and the residual moisture.
- OSTI ID:
- 6449655
- Journal Information:
- Annu. Book ASTM Stand.; (United States), Journal Name: Annu. Book ASTM Stand.; (United States) Vol. 26; ISSN ASTSA
- Country of Publication:
- United States
- Language:
- English
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