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ASTM D388-15
Standard Classification of Coals by Rank
Automaticky preložený názov:
Štandardná klasifikácia Uhlie by Rank
NORMA vydaná dňa 15.5.2015
Informácie o norme:
Označenie normy: ASTM D388-15
Poznámka: NEPLATNÁ
Dátum vydania normy: 15.5.2015
Kód tovaru: NS-590480
Počet strán: 7
Približná hmotnosť: 21 g (0.05 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM D388-15 :
Keywords:
anthracite, bituminous, coal, lignite, rank,, ICS Number Code 75.160.10 (Solid fuels)
Doplňujúce informácie
| Significance and Use | ||||||||||||||||||||||||||||||||
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4.1 This classification establishes categories of coal based on gradational properties that depend principally on the degree of metamorphism to which the coal was subjected while buried. These categories indicate ranges of physical and chemical characteristics that are useful in making broad estimates of the behavior of coal in mining, preparation, and use. |
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| 1. Scope | ||||||||||||||||||||||||||||||||
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1.1 This standard covers the classification of coals by rank, that is, according to their degree of metamorphism, or progressive alteration, in the natural series from lignite to anthracite. 1.2 This classification is applicable to coals that are composed mainly of vitrinite. Note 1: Coals rich in inertinite or liptinite (exinite), or
both, cannot be properly classified because, in those macerals, the
properties that determine rank (calorific value, volatile matter,
and agglomerating character) differ greatly from those of vitrinite
in the same coal. Often such coals can be recognized by megascopic
examination. In North America, these coals are mostly nonbanded
varieties that contain only a small proportion of vitrain and
consist mainly of attrital materials. The degree of metamorphism of
nonbanded and other vitrinite-poor coals can be estimated by
determining the classification properties of isolated or
concentrated vitrinite fractions, or by determining the reflectance
of the vitrinite (see Test Method D2798 and Appendix X1 of this
classification). However, in the use of these vitrinite-poor coals,
some properties normally associated with rank, such as rheology,
combustibility, hardness, and grindability (as well as the rank
determining properties) may differ substantially from those of
vitrinite-rich coals of the same degree of metamorphism.
The precision of the classification of impure coal may be impaired by the effect of large amounts of mineral matter on the determination of volatile matter and calorific value, and on their calculation to the mineral-matter-free basis. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3.1 Exception—The values stated in British thermal units per pound are to be regarded as the standard. The SI equivalents of British thermal units per pound are approximate. |
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| 2. Referenced Documents | ||||||||||||||||||||||||||||||||
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