Question

Whatfactorsare to be consideredbeforereopeninga sealedoff area?Discuss.Whatis the grahamratio?

Answer 1

Consideration of sealed off area:

1. Extent and intensity of fire at the time of sealing.

2. Nature of burning material and adjacent strata.

3. Airtightness of stoppings and the sealed area.

4. Composition of the atmosphere in sealed area.

5. Inert gas injection.

Graham Ratio:

The ratio of the amount of carbon monoxide produced over the oxygen absorbed varies with the temperature of oxidation of coal and also with the time of coal exposure to oxidation, thereby allowing this ratio to be used as an index of the rate of oxidation in a mine.

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