Cyclopedia of heating, plumbing and sanitation; a complete reference work . ense 300 ?*?954 .314 pound of steam per hour; so that we may assume inround numbers a condensation of \ of a pound of steam per hour foreach square foot of direct radiation, when computing the siz<steam pipe- in low-pressure heating. Table WII ha- been calculatedon this assumption, and gives the square feet of heating surface TABLE XVIIHeating Surface Supplied by Pipes of Various SizesLength of Pipe, 100 I Size or lui Sqi i l Beating Si . Pound Drop i Pound Drop 1 H H22J 3 3 V 4 5 6 7 8 80 1 15 190 525 950 2,3
Cyclopedia of heating, plumbing and sanitation; a complete reference work . ense 300 ?*?954 .314 pound of steam per hour; so that we may assume inround numbers a condensation of \ of a pound of steam per hour foreach square foot of direct radiation, when computing the siz<steam pipe- in low-pressure heating. Table WII ha- been calculatedon this assumption, and gives the square feet of heating surface TABLE XVIIHeating Surface Supplied by Pipes of Various SizesLength of Pipe, 100 I Size or lui Sqi i l Beating Si . Pound Drop i Pound Drop 1 H H22J 3 3 V 4 5 6 7 8 80 1 15 190 525 950 2,320 3,250 5,800 9,320 13,800 19,440 114 210 340 750 1,350 2,210 4,620 8,220 13,201) 19,620 27,720 which different sizes of pipe will supply, with drops in pressure of\ and \ pounds in each 100 feet of pipe. The former should be usedfor pressures from 1 to 5 pounds, and the latter may be used forpressures over 5 pounds, under ordinary conditions. The sizes oflong mains and special pipes of large size should be proportioneddirectly from Tables XIV, XV, and XVI. 74. CONE EXHAUST FAN, INLET Blower Co. HEATING AND VENTILATION 65 Where the two-pipe system is used and the radiators have sepa-rate supply and return pipes, the risers or vertical pipes may be takenfrom Table XVII; but if the single-pipe system is used, the risersmust be increased in size, as the steam and water are flowing in oppo-site directions and must have plenty of room to pass each other. Itis customary in this case to base the computation on the velocity ofthe steam in the pipes, rather than on the drop in pressure. Assum-ing, as before, a condensation of one-third of a pound of steam perhour per square foot of radiation, Tables XVIII and XIX have beenprepared for velocities of 10 and 15 feet per second. The sizes givenin Table XIX have been found sufficient in most cases; but the largersizes, based on a flow of 10 feet per second, give greater safety andshould be more generally used. The size o
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