Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 164
y be utilized in a feed-water heater Peed-Plpe near Heater, to Deter- e 1 • o i- ■ , i» 1 mine Temperature of Water. of large size. Sometimes part of the heat is derived from an economizer placed in the smoke passage from the boilers. Systems of Piping. The mains for forced circulation are… … to 127 118 HEATIXCx AND VENTILATION The flow throuo;h the risers is produced by the difference inpressure in the supply and return mains; and as this is greatestnearest the pump, it is necessary to place throttle-valves in the risersto prevent short-circuiting and to secure an even distribution…
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