. Central station heating. that reason, will not be discussed here. This is,however, a very important proposition and care andthought should be given the subject. In selecting a boiler for a hot water plant there is onegeneral principle that must be followed. It is that in cir-culating the water through the boiler never do this in op-position to gravity or the natural circulation of the boiler. For examples of this principle, methods of connectingsome of the boilers of different types arc shown here. In determining the size of the boilers, figure the B. T. lbs. of steam necessary to suppl
. Central station heating. that reason, will not be discussed here. This is,however, a very important proposition and care andthought should be given the subject. In selecting a boiler for a hot water plant there is onegeneral principle that must be followed. It is that in cir-culating the water through the boiler never do this in op-position to gravity or the natural circulation of the boiler. For examples of this principle, methods of connectingsome of the boilers of different types arc shown here. In determining the size of the boilers, figure the B. T. lbs. of steam necessary to supply (i) the connectedload, (2) the line loss and (3) the station loss per hour,divide this by 33,000 or 30, respectively, and the quotientis the horse power necessary. For example: Steam plant, 100,000 sq. ft. connected. 100,000 X lbs. = 33,000 lbs. steam per loss = 2,qoo lbs. steam. Station loss = 1,300 lbs. steam. 37,200 lbs. ,200 1= 1,240 horse power for the maximum conditions. 30 HEATING STATION 89. Fig. 25—two WAYS OF CONNECTING STERLING BOILERS ARRANGEMENT FOR CONNECTING WICKES BOILER 27—ARRANGEMENT FOR CONNECTINGHORIZONTAL TUBULAR BOILER
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