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APPENDIX 789
DATA RELATING TO HEAT AND WORK
1 British Thermal Unit . . . = 778 ft. 1b.
= 0-252 kg. calorie.
3-968 „ „ Units . . . = 1 kg. cal.
2,545 „ „ „ . = 1 h.p. hour (British).
= 641 kg. cals.
= 746 watts.
1-34 h.p. hours . . . . = 1 k.w. liour.
= 3,410 B.Th.U.
= 858 kg. cals.
1 Therm. 39-3 h.p. hours.
SULPHATE OF AMMONIA
Average commercial salt contains :— Ammonia ....... from 24J to 25|%
Equal to— Nitrogen . ......................20-2 to 20-8%
Free acid ....... 0-4%
Moisture . . . . . . . 2 to 3%
Materials required for the mamifacture of 1 ton of sulphate of ammonia :—• Liquor, approximately . . . 3,400 gallons of 8 oz. strength.
Acid . . . . . .18 cwt. at 80% strength.
Lime . . . . . .3 cwt.
The sulphate of ammonia recovered per ton of coal varies in this country between 24 and 28 1b.
Equation for formation :— 2NH3 + H2SO4 = (NH4)2SO4.
Gallons of liquor x ounce strength x 0-0823 = 1b. of sulphate.
CAPACITY OF TAR AND LIQUOR PUMPS
Duplex Pumps (e.g. “ Oddesse ” type)
Capacity, gal. per hour. j Diameter of Cylinders. Stroke. Minimum steam pressure required for lifting 50 feet.
Tar. Liquor. Steam end. Pump end.
2,000 3,000 6 inches 4 inches 6 inches 20 1b. sq. inch.
2,400 3,600 6 „ *2 » 6 „ 25 „ „
3,000 4,500 7 „ 6 „ 6 „ 25 „ „
4,250 6,350 6 „ - 6 „ 6 „ 35 „ „
5,900 8,800 6 „ 7 „ 6 „ 50 „ „
6,800 10,200 6 „ 7i „ 6 „ 55 „ „
10,000 15,000 8 „ 8 „ 10 „ 35 „ „
15,000 22,500 10 „ 10 „ 10 „ 35 „ „
22,000 33,000 12 „ 12 „ 10 „ 35 „ „