Last checked by Coal Boss
Non-coking coal in India used to be graded by Useful Heat Value (UHV) into lettered grades. UHV was a calculated figure worked out from ash and moisture, rather than a direct measurement of the heat in the coal.
The Government of India moved non-coking coal to grading by Gross Calorific Value (GCV) — a direct laboratory measurement — in bands of 300 kcal/kg, from G1 (above 7,000 kcal/kg) to G17 (2,201–2,500 kcal/kg). The Ministry of Coal publishes the current grade table.
Older contracts, reports and conversations sometimes still use the UHV letters, so it helps to know both — but current PSU sale and auction terms use the GCV grades.
What it means if you trade coal
Price and quality conversations today run on GCV. If a counterparty quotes an old lettered UHV grade, ask for the GCV and the basis it's reported on before comparing anything.
Hinglish mein, short mein
UHV (Useful Heat Value) India mein non-coking coal ki grading ka purana tareeka tha — ash aur moisture se nikala hua figure, letter wale grade ke saath. Uski jagah GCV wali grading aayi: seedha lab ka naap, 300 kcal/kg ke band mein, G1 (7,000 se upar) se G17 (2,201–2,500) tak, Ministry of Coal ke hisaab se. Aaj PSU ki bikri aur auction ki terms GCV grade pe chalti hain.
Sources
- OfficialMinistry of Coal — Coal grades
Coal Boss explanation, based on the sources above.
