Wednesday, June 15, 2011
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 |
Source: Ministry of Coal
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