Q. What is the basis of grading of two types of coal -- coking, non-coking?
A.---Coking coal is graded on the basis of ash percentage as follows:
---Non-coking coal is graded on the basis of UHV(ultimate heat value) as follows:
A.---Coking coal is graded on the basis of ash percentage as follows:
Range of ash %(A)
|
Name of grade
|
15<A
|
Steel-I
|
15<A<18
|
Steel-II
|
18<A<21
|
Washery-I
|
21<A<24
|
Washery-II
|
24<A<28
|
Washery-III
|
28<A<35
|
Washery-IV
|
---Non-coking coal is graded on the basis of UHV(ultimate heat value) as follows:
Grades
|
UHV range in Kcals/kg(R)
|
A
|
R>6200
|
B
|
5601<R<6200
|
C
|
4941<R<5600
|
D
|
4201<R<4940
|
E
|
3361<R<4200
|
F
|
2401<R<3360
|
G
|
1301<R<2400
|
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