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Charging the Common Cupola

The following table of common straight cupolas, from 24 to 84 inches diameter inside of lining, all of which have a bed depth of 10 inches, show what amount of fuel is required for the bed, first charge of iron, and succeeding charges of fuel and iron. Also blast-pressure and tuyere area required to melt a given quantity of iron per hour, as well as the total melting capacity of each cupola designated. All the figures are based upon what may be considered as safe practice under ordinary conditions. A proportionate increase or decrease of bed fuel is necessary when the depth of sand-bed differs either way from 10 inches, as given; and any increase of burden in order to obtain improved ratios of melting must be introduced gradually. The results as per table are absolutely certain when the power is adequate and blast-pipes, etc., sufficiently capacious and free from leaks. The total melting capacities given represents what may be expected irrespective of any system of slagging, or other means ordinarily adopted for continuous melting:

Diameter Inside of Lining. Depth from Sand-bed to Under Side of Tuyere. Weight of Fuel on Bed. First Charge of Iron. Succeeding Charges of Fuel. Succeeding Charges of Iron. Number of Tuyeres 6 In. Diameter, or their Equivalent. Blast Pressure. Melting Capacity per Hour. Total Melting Capacity. In. In. Lbs. Lbs. Lbs. Lbs. Oz. Lbs. Lbs. 24 10 300 900 50 500 1.5 6 1,500 6,000 30 10 570 1,700 176 1,584 2.6 7 3,000 12,000 36 10 840 2,520 260 2,340 3.3 8 4,820 18,280 42 10 1,110 3,330 428 3,852 5.8 10 7,550 30,200 48 10 1,380 4,140 554 4,986 6.8 12 10,760 43,040 54 10 1,650 4,950 680 6,120 10.7 14 13,850 55,400 60 10 1,920 5,760 806 7,254 13.7 14 16,940 67,760 66 10 2,190 6,570 932 8,388 15.4 14 21,200 84,800 72 10 2,460 7,380 1,058 9,522 19. 16 26,070 104,280 78 10 2,730 8,190 1,184 10,656 26. 16 31,800 127,200 84 10 3,000 9,000 1,310 11,790 31. 16 37,530 150,120 See RATIO OF FUEL TO IRON; BLAST-PIPES; SLAG.