Handbook for heating and ventilating engineers . 90 HEATING AND VENTILATION seems to give satisfaction; but it is very evident that, wlicxcbasement mains are long and more complicated, a mixing©f the two streams is unavoidable, thus rendering the sys-tem unreliable. The tvco-pipe system is used on both and hotwater installations. For steam work it is probably nobetter than the one-pipe system but for hot water work itis much preferred. In this system two separate and dis-tinct paths may be traced from any radiator to the sourceof heat. In the basement are two mains, the flow and theretu
Handbook for heating and ventilating engineers . 90 HEATING AND VENTILATION seems to give satisfaction; but it is very evident that, wlicxcbasement mains are long and more complicated, a mixing©f the two streams is unavoidable, thus rendering the sys-tem unreliable. The tvco-pipe system is used on both and hotwater installations. For steam work it is probably nobetter than the one-pipe system but for hot water work itis much preferred. In this system two separate and dis-tinct paths may be traced from any radiator to the sourceof heat. In the basement are two mains, the flow and thereturn, and the risers from these are always run in pairs,the flow riser on one side of a tier of radiators, the returnriser on the other side. A two-pipe steam system musthave a sealed return. Typical two-pipe main and riser con-nections are shown in Fig. Fig. 35. Fig. 36. 66. A third system, known as the attic main, or Millssystem, has found much favor with heating engineers inthe installation of the larger steam plants although it couldbe applied as well to the larger hot water plants. Thedistinguishing feature, when applied to a steam system,is the double main and single riser, so arranged that thecondensation and live steam flow in the same direction. HOT WATER AND STEAM HEATING 91 This is accomplished by taking- the live steam directly tothe attic by one large main, which there branches, as needbe, to supply the various risers, only one riser being usedfor each tier of radiators and the direction of flow of bothsteam and condensation in risers being downward. Hence,this system avoids the unsightliness of duplicate risers, asin the two-pipe system, and avoids the disadvantage of theone-pipe basement system, the last named having steamand condensation flowing in opposite directions in the samepipe. Fig. 36 shows two common methods o
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