Document b5qggzZD1pm4ordLNvK0m6mp3

HEATING VENTILATING AIR CONDITIONING GUIDE 1942 Table 4. Comparative Capacity of Steam Lines at Various Pitches for Steam and Condensate Flowing in Opposite Directions3 Pitch of Pipe in Inches per 10 Ft Pitch or Pips H IN. Pipe Sice Inches Sq Ft Rad. Based on 240 Btu 3 H 25.0 12 1 45.8 12 IK 204.9 18 iK 142.6 18 2 236.0 19 K HI. Sq Ft Rad. Based on 240 Bta *>5 1 30.3 52.6 117.2 159.0 263.5 14 15 20 21 20 1 IN. Sq Ft Rad. Based on 240 Btu J 37.3 63.0 133.0 181.0 299.5 18 17 23 23 23 IK IN. Sq Ft Rad. Baaed on 240 Btu M(9 a 40.4 70.0 244.5 196.5 325.5 19 20 25 25 25 2 IN. Sq Ft Rad. Based on 240 Bta -j 1 42.5 75.2 154.0 209.3 346.5 20 22 27 27 27 3 IN. Sq Ft Rad. 2 Based on 240 Bta . .i 2 46.1 83.0 165.0 224.0 371.5 21 23 28 28 28 4 IN. Sq Ft Rad. Based on 240 Bta > 1 2 47.5 87.9 172.6 234.8 388.4 22 25 29 30 29 5 m. Sq Ft Rad. Baaed oq 240 Btu w4 1 49.3 90.2 178.2 242.6 401.1 23 26 31 31 30 Data from American Society of Heating and Ventilating Engineers Research Laboratory. waver in certain parts of the system until the steam flow is reduced sufficiently to permit the water to pass. The velocity at which such disturbances take place is a function of (1) the pipe size, whether the pipe runs horizontally or vertically, (2) the pitch of the pipe if it runs hori- Table 5. LEnoT,N^NT^Ei7T OF PlFE T<1 88 Added to Actual Length of Run- Owing to Fittings--to Obtain Equivalent Length Size of Pipe Inches Length in Feet to be Added to Run Standard Elbow Side Outlet Tee Gate Valve Globe Valve Angle Valve H 1H m ii^ 2 2'A 3 3H 4 5 6 8 10 12 14 1.3 1.8 2.2 3.0 3.5 4.3 5.0 6.5 8 9 11 13 17 21 27 30 "Value in full open position. Example of length in feet of pipe to be added to actual length of run. 3 0.3 14 7 4 5 6 7 0.4 18 0.5 23 0.6 29 0.8 34 10 12 15 18 8 ir 13 15 18 22 27 35 45 53 63 1.0 46 22 1.1 54 27 1.4 66 34 1.6 80 40 1 9 92' 45 2.2 112 56 2.8 136 67 37 180 92 4 6 230 112 5.5 270 - 132 64 310 152 h * Measured Length *= 132.0 ft 4 in. Gate Valve . *= 1.9 ft . , 4--*4 in. Elbows ** 36.0 ft --------v Equivalent Length 169.9 ft 1.............. H 290 CHAPTER 15. PIPING FOR STEAM HEATING SYSTEMS Table 6. Steam Pipe Capacities Capacity Expressed in Square Feet of Equivalent Direct Radiation (Reference to this table will be by column letter A through L) This table is based on pipe size data developed through the research investiga tions of the American Society of Heating and Ventilating Engineers. CAPACITIES OF STEAM MAINS AND RISERS Direction or Condensation Flow in Pipe Line PlPB With the Steam in One-Pipe and Tiro-Pipe Syetema 8tuIn. l/z2 lb */* lb Vie lb j or or. or 141b Xlb or Klb . 2 O* 4 0i 8 0*Oi 1 Os Drop Drop Drop Drop Drop Drop Against the Steam Two-Pipe Only Verticall nCD 1H VA m 2 2A 3 '3'A 4 5 6 8 10 12 16 30 39 46 56 79 87 100 122 173 134 155 190 269 273 315 386 546 449 518 635 898 822 948 1,163 . 1,645 1,228 1,419 1,737 2,457 1,738 2,011 2,457 3,475 3,214 3,712 4,546 6,429 5,276 6,094 7,462 10,553 10,983 12,682 15,533 21,967 20,042 23,144 28,345 40,085 32,168 37,145 45,492 64,336 60,506 69,671 84,849 121,012 30 111 157 56 245 346 122 380 538 190 771 1,091 386 1,270 1,797 635 2,326 3,289 129 3,474 4,913 111,548 4,914 6,950 2,042 9,092 12,858 14,924 21,105 31,066 43,934 .56,689 80,171 90,985 128,672 169,698 ,242,024 26 58 95 195 395 700 1.150 1,700 13.150 Special Capacities roa One-Pifs Systems Onlt Supply Risen UpFeed Radiator Valves and Vertical Con nections tadiator and Riser Run outs Jb K Lc 25 45' 98 152 288 464 799 1,144 1,520 _______ *:----- -- -------- 20 55 81 165 -- 20 55 81 165 260 475 745 1,110 2,180 z: ______ -- -- All Horizontal Mains and Down-Feed Riaera _________ Up* Feed Risers Mains - - UpFeed Run Risen outs Radiator Run- Connections Dripped No/*.---All drops shown are in pounds per 100 ft of equivalent run--based on pipe properly reamed, aDo not use Column H for drops of 1/24 or 1/32 lb; substitute Column C or Column B as required. f>Do not use Column J lot dropof 1/32 )b except on sizes 3 in. and over; below 3 in. substitute Column 3. ccOunn rraadaiiaatioorr rruunnoouutws ovvewr 8 _ f American SKciett Copyright j [{entire. Piping awl Aof.vtpirlto"HvCneogna*dt--i-ini-nt-ico-o-rn-e-iana----ngs--deC---oo,V-rn-ne--t--ern-a---t-dpo-oi-pan---et--N--o-s-a-oi-tzioecEno-navtoeAiwnrueotehcbiasatt.vsmhio1) wNMon uointt TtoSabpbwlee*e. cR6ia.elprPinetremd iWWssilititohrhi.n_- zontally, (3) the quantity of condensate flowing against the steam, and (4) freedom of the piping from water pockets which under certain con ditions act as a restriction in pipe size. Three factors of uncertainty always exist in determining the capacity of any steam pipe. The first is variation in manufacture, which appar ently cannot be avoided. The second is the care used in rearning the ends of the pipe after cutting. The effect of both of these factors increases as the pipe size decreases. According to A.S.H.V.E. Research Laboratory tests, either of these factors may affect the capacity of a 1-in. pipe as much as 20 per cent. The third factor is the uniformity in grading the pipe line. All of the capacity tables given in this chapter include a factor of safety. However, the factor of safety referred to does not cover abnormal defects or constrictions nor does it cover pipe not properly reamed. 291