TAPHOLE,
Explanation:
IN BLAST FURNACES : nozzles suggested above is a a different thing. E.g. Air that has been preheated to temperatures from 900° to 1,250° C (1,650° and 2,300° F), together with injected fuel such as oil or natural gas, is blown into the furnace through multiple tuyeres (nozzles) located around the circumference of the furnace near the top of the hearth;
TROVATO BUSAGGIO which is a TAPHOLE and the latter serves as follows
.... Molten iron accumulates in the hearth, which has a TAPHOLE to draw off the molten iron and, higher up, a slag hole to remove the mixture of impurities and flux.
BUSETTA, BUSAGGIO, BUSO = BUCO
| oldnick
Russian Federation
Local time: 09:56
Native speaker of:  Russian
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The translation workplace 
