Question

# Calculate the OB for 1kg of a high explosive with the following composition. NG 9% TNT...

Calculate the OB for 1kg of a high explosive with the following composition.

 NG 9% TNT 2% AN 63% Sodium nitrate 12% S:G pulp 12% Calcium carbonate 2% Total 100%

Is this mixture in balance with regard to oxygen? What change in composition would you suggest to improve the OB?

The oxygen balance table is given below :

Basis : 1kg of fuel

Nitroglycerine 9%

Trinitroglycerine 2%

Ammonium Nitrate 63%

Sodium nitrate  12%

S:G pulp 2%

OB = 35.109 – 2 (7.053) - 0.5 (41.464) - 0.200 - 0.5 (1.411) = - 0.6345 g-atom/kg

We can see that the explosive is slightly oxygen deficient (fuel rich), reduce the fuel content(TNT,NG) or increase the oxidant (AN).

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