. Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students. uild-ings of 8 or 10 stories the expansion may be taken up by swivelconnections in the basement like those shown in Fig. 56, similarswings being used in the attic if the overhead-feed system isused. The connections in this case should be with the bottomof the main in order to secure proper drainage. In buildingsover 10 stories in height slip joints or expansion loops of thegeneral form shown in Fig. 57 should be placed in the riser every6 or 8 stories. Expansion loops of this kind
. Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students. uild-ings of 8 or 10 stories the expansion may be taken up by swivelconnections in the basement like those shown in Fig. 56, similarswings being used in the attic if the overhead-feed system isused. The connections in this case should be with the bottomof the main in order to secure proper drainage. In buildingsover 10 stories in height slip joints or expansion loops of thegeneral form shown in Fig. 57 should be placed in the riser every6 or 8 stories. Expansion loops of this kind are unsightly ifexposed, but they may generally be concealed, either in speciallyprovided pockets in the floor or in spaces furred down below theceilings near the walls. 92 HEATING AND VENTILATING PLANTS One-Pipe Circuit Syste-m.—A system often employed withgood results in buildings of small and medium size is shown inFig. 58. In this arrangement a single main of uniform size iscarried entirely around the basement with a slight downwardpitch, the extreme end being dripped to the boiler below the Fig. 57 Fig. 55. Connecting Risers with Mains and 56. Swivel for Taking up Expansion in 57. Expansion Loops for Risers in High Buildings. The radiators are connected with the main through a single pipeand all condensation is carried along in the lower part of themain in the same direction with the steam. This system is especially adapted to small apartment houses oftwo or three stories where each flat is provided with a separateboiler, on account of the simplicity of the piping, which eliminatesall return mains in the basement. A modification of this system adapting it to larger buildings isshown in Fig. 59. The riser shown in this case is one of several,the number depending upon the size of the building, and may besupplied either at the bottom or top as most desirable. If steam issupplied at the bottom of the riser, as shown in the cut, all of t
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