Document rp1qZ88noMG3ee9yr5dLm32K0

AMERtCAN SoCIETY of Hkatoo and Ventilating Eng,neers Guide. SUPPLY MAIN 1 r~r i I HARTFORD RETURN . CONNECTION, .CHECK VALVE ; ^-VACUJJM PUMP. 'lift FITTING fiJ^BYBASS TO*OPEN DRAfi'. Fig. 5. Typical Installation Using Vacuum Pump Table 12 is for comparatively small vapor systems. One ounce pressur drop may be understood to mean that the water in the vertical pipe whid drains fhe end of the supply main will stand about 2 in. higher than thi water line in the boiler, under normal conditions. Chapter 10--Piping for Steam Heating Systems T'aTbalebl1e2.13Usshionwgsthtehseepsipzees,sitzhees wfoartelarrginerthveapvoresvrstdemrca/5h?se ln the end of the supply main, will stand about 4 in hithlPXwb`C,b dratns line in the boiler under normal operation. ' g er tflan tf)e water diffTearebnlece14mshwoawtserthlineepimpeaysizbees afollorwveadpobrestwyseteenms - St.ll! ff^ater in the return drop-pipe under normal operation Wk 1, boiler and wnere the basement TablSeys9t.emP, iwpeheSriezeEsqufoivralOente-LPiepnegtAhiro-fVeRnutn lporwom r>F,,L?,f,?RE SIEAM Heating _ Supply to the Farthest Radiator -ES^ ",3**** OF Based on Tointa5l ?P.reFsIs.uoref EDqroupivoafleIntozR.apdeirat1io00nft. Fa* Sa Ikcszs Soppdt Main Chipped 4gP Bbancbes to Hisses Dhipfso Steam and Condensate flowing in the same direction. "4 B i m 2 2K 3 3K 56 122 190 386 635 1163 1737 SUPPLY Risebs Up-Feed C 25 45 98 152 288 464 799 1144 '4 2457 1520 5 4546 -- 6 7462 -- Branches to Supply Risers and Radiators Not Dripped Wet Return Main E 20 700 55 1200 81 1900 165 260 . 4000 6700 475 745 ' ' 10,700 -- 1110 -- 2180 -- -- Dry Return Main F Radiator Valve Sizes and Vertical Connections 0 320 670 1058 2300 3800 '7000 10,000 -- -- 20 55 81 165 ...... -- -- Vrinht ioi7 / American Society or Heating and Ventilating Engineers \ Not to be Reprinted With* copyngnr, V9tt ^ Heating and Piping Contractor* Natiimal Attocialitm j out Special Permission INSTRUCTIONS FOR USING TABLE 9 aI. Radiator branches more than 8 ft. in length should be one size larger than shown . in Gol. D. 2. These tables apply where pipes are properly reamed. No allowances for defective material or workmanship have been made. (See Tables 7 and 8). 3. Capacities based on lb. condensation per square foot per hour equivalent radiation and actual diameter of standard pipe. 4. Extra length to be added to straight run of pipe, for various fittings and valves to determine equivalent length. (See Table 4). b. Where it is necessary to drip a steam main, branch to riser or risers, same should be dripped separately into wet return. 6. Pitch of mains should be not less than in. in 10 ft.; on horizontal branches to radiators and risers at least H in. in 10 ft. "7. In general it is desirable not to have a supply main smaller than 2 in. in diameter. un1 suPply main is larger than in. at the beginning, it is desirable that it shall not be smaller than in. at the end. -- 163