Coal Grading in India

Topics: Coal assay, Coal, Heat of combustion Pages: 5 (315 words) Published: August 26, 2013
COAL GRADING IN INDIA: The gradation of non-coking coal is based on Useful Heat Value (UHV), the gradation of coking coal is based on ash content and for semi coking / weakly coking coal it is based on ash plus moisture content , as in vogue as per notification.

Grades of Coking Coal

Grade

Ash Content

Steel Grade –I

Not exceeding 15%

Steel Grade -II

Exceeding 15% but not exceeding 18%

Washery Grade -I

Exceeding 18% but not exceeding 21%

Washery Grade -II

Exceeding 21% but not exceeding 24%

Washery Grade -III

Exceeding 24% but not exceeding 28%

Washery Grade -IV

Exceeding 28% but not exceeding 35%

Grades of Non-coking Coal

Grade

Useful Heat Value (UHV)

(Kcal/Kg)

UHV= 8900-138(A+M)

Corresponding

Ash% + Moisture %

at (60% RH & 40O C)

Gross Calorific Value GCV (Kcal/ Kg)

(at 5% moisture level)

A

Exceeding 6200

Not exceeding 19.5

Exceeding 6454

B

Exceeding 5600 but not exceeding 6200

19.6 to 23.8

Exceeding 6049 but not exceeding 6454

C

Exceeding 4940 but not exceeding 5600

23.9 to 28.6

Exceeding 5597 but not exceeding. 6049

D

Exceeding 4200 but not exceeding 4940

28.7 to 34.0

Exceeding 5089 but not Exceeding 5597

E

Exceeding 3360 but not exceeding 4200

34.1 to 40.0

Exceeding 4324 but not exceeding 5089

F

Exceeding 2400 but not exceeding 3360

40.1 to 47.0

Exceeding 3865 but not exceeding. 4324

G

Exceeding 1300 but not exceeding 2400

47.1 to 55.0

Exceeding 3113 but not exceeding 3865

Grades of Semi-coking and Weakly Coking Coal

Grade

Ash + Moisture Content

Semi coking grade –I

Not exceeding 19%

Semi coking grade –II

Exceeding 19% but not exceeding 24%

Grades of NEC Coal :

Grades

UHV (Kcal/Kg)

Corresponding

Ash% + Moisture %age

A

6200-6299

18.85 – 19.57

B

5600 – 6199

19.58 – 23.91

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