- subbituminous class
- na class of rank consisting of subbituminous C coal, subbituminous B coal, and subbituminous A coal.
ASTM D121-09a Standard Terminology of Coal and Coke. 2014.
subbituminous class
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subbituminous A coal — n the rank of coal, within the subbituminous class of Classification D388, such that, on the moist, mineral matter free basis, the gross calorific value of the coal in British thermal units per pound is equal to greater than 10 500 (24.42 Mj/kg)… … Coke&Coal Terminology
subbituminous B coal — n the rank of coal, within the subbituminous class of Classification D388, such that, on the moist, mineral matter free basis, the gross calorific value of the coal in British thermal units per pound is equal to greater than 9500 (22.10 Mj/kg)… … Coke&Coal Terminology
subbituminous C coal — n the rank of coal, within the subbituminous class of Classification D388, such that, on the moist, mineral matter free basis, the gross calorific value of the coal in British thermal units per pound is equal to greater than 8300 (19.31 Mj/kg)… … Coke&Coal Terminology
rank — n of coal, a classification designation that indicates the degree of metamorphism, or progressive alteration, from lignite to anthracite. • anthracite anthracitic class bituminous class high volatile A bituminous coal high volatile B bituminous… … Coke&Coal Terminology
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