i STEAM COAL - Clpdigital.org

30 THE COAL TRADE BULLETIN.
Tain th l •" '' thP "' b ° ilPrS - Th6n When t,lis « 0 »P^son is between the ordinary
a 1 rJ , eC ° n0mi ° al ty ' ,e of ^ squires straign. line type of compressor, commonly used
a laiger boiler plant to burn the extra coal to by most coal mines, and a cross-compound Corliss
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keep up the steam, which means more firemen and
more repairs and more trouble with bad water.
CONDENSER.
ITEMS.
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STRAIGHT LINE COMPRESSOR
PLANT.
(Full Lines)
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condensing two-stage air compressor, the relative
difference in economy is quite marked, even for
CORLISS COMPRESSOR PLANT.
(Dotted Lines)
Air pressure at receiver,
NON-CONDENSING.
CONDENSING.
pounds per square inch, 100 pounds
Steam pressure
100 pounds
Type of steam engine
Single cylinder
Type of steam valve gear Meyer Valve Gear
Type of air compressor
Single stage
Water rate, steam engine 35 lbs. per I.H.P. per hour.
I.H.P. per 100 cu. ft. free air. . 20% I.H.P
Type of boiler
Return tubular
Type of buildings
Wood structure
Foundations and piers
Concrete
Interest on investment
4 per cent
Depreciation and repairs 8 per cent
No. hours per year considered. 6,000 hours
Cost of coal at boilers
75c. to $1.00 per ton
Compressor capacity in free
100 pounds.
125-135 pounds.
Cross-compound cylinders.
I Corliss Valve Gear
Two stage.
15 lbs. per I.H.P. per hour.
17% I.H.P.
Water tube.
Wood and structural steel.
Concrete.
4 per cent.
6 per cent.
6,000 hours.
75c. to $1.00 per ton.
air per minute
1,500 to 11,000 cu. ft. 1,500 to 11,000 cu. ft.