COAL GRADES
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 |
