. Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers. tems haveto be considered. In determining the size stack to use, the engineer mustbe sure to build the chimney sufficiently large to take care of any addi-tional units to the boiler plant and at the same time, select the mosteconomical size for the operation of the boilers. The first thing there-fore to consider is the draft required. For general practice the assump-tions for draft losses are about as follows: Loss in boiler in. Loss in furnace in. Flues in. for 100 ft. of flue plus right-a
. Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers. tems haveto be considered. In determining the size stack to use, the engineer mustbe sure to build the chimney sufficiently large to take care of any addi-tional units to the boiler plant and at the same time, select the mosteconomical size for the operation of the boilers. The first thing there-fore to consider is the draft required. For general practice the assump-tions for draft losses are about as follows: Loss in boiler in. Loss in furnace in. Flues in. for 100 ft. of flue plus right-angle bends figured at example, let us assume a 150 ft. x 6 ft. chimney which is the stand-ard size generally used for 1000 hp. of boilers. Assuming that the planthas two 500 hp. boilers, we can figure that the draft loss through the boiler 48 Transactions of Am. Soc. of Engineers TABLE -DRAFT REQUIRED AT BASE OF STACK Sum of Resistances of Boi ler Flue and Fire Based on Fl ue Temperature of^ 500 Peg Fahr., if 600 Decj Fahn is Expected- Multi ) Sum x 5 10 15 20 25 30 35 40 Velocif L) of Gas in Stack, Ft. per Sec 45 50 o T3<L) C CO DO O STACKDIAM. lO 15 25 30 35 AO 45 4 &-5S 1250 1670 2030 2510 2930 35SO 3760 loao 1620 2060 2700 3240 3780 432 O 48 50 5 . 1360 2040 2720 3400 4080 4750 5440 6100 leeo 2500 3330 4160 5000 5820 6660 7500 e 20/0 3OI0 4010 5020 eo2o 7030 8040 9000 2380 3560 4750 59 SO 7I40 8310 9SOO 107OO 7 2730 4180^ S570 6960 8350 9750 11140 12500 3220 4820 6440 8040 9660 11250 128 70 14500 8 36&0 5540 7390 9220 1I030 12380 14720 16500 as 4180 6250 8360 104SO I2530 14620 16710 18800 9 4700 7050 9400 11750 14100 .16500 18810 21200 10 5860 8780 moo 14650 17600 20500 23400 26300 If 7I40 10700 14300 17850 2I40C 25O00 28600 32100 12 8S30 128 OO 17050 2I30O 2S600 29800 3410O 38400 Based on 500 +ack Coal x Radial Brick Chimneys, W. F. Leggo 49 and furnace would be in. For the t
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