COST OF VARIOUS TYPES OF FURNACES ------------------------------------------------------------------------------- | Class fuel | Fuel per | Unit fuel|Installation|Efficiency| Fixed |Cost per | | charge | cost | cost | per cent |charges| charge -|------------|------------|----------|------------|----------|-------|-------- | 1 | 2 | 3 | 4 | 5 | 6 | 7 -|------------|------------|----------|------------|----------|-------|-------- Carburizing -|------------|------------|----------|------------|----------|-------|-------- 1|Oil | 52.0 gal. |$0.15 gal.| $2,400.00 | 12.6 | $.40 | $8.20 2|Natural gas | 4.4 M | 0.50 M | 2,400.00 | 18.8 | 0.40 | 2.60 3|City gas | 8.3 M | 0.80 M | 2,400.00 | 17.0 | 0.40 | 7.04 4|Water gas | 18.7 M | 0.40 | 2,400.00 | 16.4 | 0.40 | 7.88 5|Producer gas| 37.3 M | 0.10 M | 2,400.00 | 14.5 | 0.40 | 4.13 6|Coal |814.0 lb. | 6.00 ton | 3,600.00 | 9.4 | 0.60 | 3.98 7|Electricity |500.0 kw-hr.| 0.015 kw.| 9,000.00 | 53.0 | 1.50 | 9.00 -|------------|------------|----------|------------|----------|-------|-------- Heating -|------------|------------|----------|------------|----------|-------|-------- 1|Oil | 30.8 gal. | 0.15 gal.| 2,400.00 | 21.4 | 0.10 | 4.72 2|Natural gas | 2.61 M | 0.50 M | 2,400.00 | 32.0 | 0.10 | 1.40 3|City gas | 4.9 M | 0.80 M | 2,400.00 | 28.8 | 0.10 | 4.02 4|Water gas | 11.1 M | 0.40 M | 2,400.00 | 27.6 | 0.10 | 4.54 5|Producer gas| 22.1 M | 0.10 M | 2,400.00 | 24.6 | 0.10 | 2.31 6|Coal |348.0 lb. | 6.00 ton | 3,600.00 | 22.0 | 0.15 | 1.38 7|Electricity |329.0 kw-hr.| 0.015 kw.| 10,500.00 | 81.75 | 0.44 | 5.38 ------------------------------------------------------------------------------- This shows but two of the operations and for a single furnace. The total costs for all operations on the 30,000 lb. of gears per 24 hr. is shown in Table 29. TABLE 29.--COMPARATIVE ANNUAL PRODUCTION COSTS FOR 30,000 POUNDS OUTPUT IN 24 HOURS