Document 2JOn2J3b39yxJQ9X5JoDBJmvR

HEATING VENTILATING AIR CONDITIONING GUIDE 1943 Table 4. Comparative Capacity of Steam Lines at Various Pitches for Steam and Condensate Flowing in Opposite Directions3 Pilch of Pipe in Inches per. 10 .Fl Pitch or Pipe H i*. K m. 1 IN. IKn*. 2 IN. 3 m. 4 IN. ' 5 m. Pipe Site laches* Sq Ft Rad. Based on 240 Btu as Sq Ft Sq Ft Rad. Based on 240 Btu > s S. Rad. Baaed on 240 Btu 3 3 S Sq Ft Rad. Based on 240 Btu > 3 S 8q Ft Rad. Based on 240 Btu Sq Ft > l Rad. Based on 240 1 Btu Sq Ft Rad. Baaed on 240 Bta - .>e i SqFt' Rad. Based on 240 Btu s? a3 K 1 IK 1H 2 25.0 12 30.3 14 37.3 18 40.,4 19 42.5 20 46.1 21 47.5 22 49.3 23 45.8 12 52.6 15 63.0 17 70.0 20 75.2 22 83.0 23 87.9 .25 .90.2 26 104.9 18 117.2 20 133.0 23 144.5 25 154.0 27 165C0 28 172.6 29 178.2 31 142.6 18 159.0 21 181.0 23 196.5 25 209.3 27 224.0 28 234.8 30. 242.6 31 236.0 19 263.5 . 20 299.5 23 325.5 25 .346.5 27 371.5 28 388.4 29 401.1 30 Data from American Society op Heating and Ventilating Engineers Research Laboratory. water 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 of vertically, (2) the pitch of the pipe if it runs hori- Table 5. Length in Feet of Pipe, to Se 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 lA l 3A . . ik . 114` 2 . 2H . ,3 ' 3H '4 ' 5 6 8 10 12 14 1.3 3 0.3 14 . 7 1.8 4 :: . 0.4 18 10 2.2 5 0.5 23 . ; 12. . 3.0 3:5 . . . . 67 0.6 29 15 0.8 34 18 4:3 , ... .8 1.0 . 46 22 : . 5.0. 11. l.i. - 54. ; 27 -f . 6.5 . . 13 .1.4-,. 66 34 . 8 '15 1.6 ' . 80 40 9 18 - 1!9 , 92 . 45' ' 11 ..22 - >. 2.2 112 56. ; 13 27 2.8 136 . .67 17 35 37 180 92 ' 21 45 4.6 230 112 27 53 5.5 270 v 132 30 63 6.4 310 152 Valve in full open position: Example of length in feet of pipe to be added to actual length of ruii. *v : Measured Length " .132.0 ft , '' 4 in. Gate Valve = 1.9 ft -- Oc'O 4:--4 in. Elbows -'=_._3_6_.0_ft y iEquivalent Length = 169.9 ft ' 1......:............. H* -. 292 CHAPTER 15. PIPING FOR STEAM HEATING SYSTEMS . Table 6. Steam Pipe Capacities Capacity Expreised.in Square Feet of Equivalent:Dirut 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 Lins Special Capacities fob One-Pipe Ststekb Onlt Pipe With the Steam in One-Pipe and Two-Pipe Systems 8ob In. i/sa lb */*4 lb /i lb Klb Klb H lb HO. Drop KDrop 1 Os Drop 20s Drop 4 0s Drop 80s Drop Against the Steam Supply Radiator Valvea Radiator Two-Pipe Only Risers Up- Vertical Hori zontal Feed and Con nections Riser Run outs AB C D E F G H Ic jb K La % 30 30 1 39 46 56 79 iii 157 56 114 87 100 122 173 245 346 122 \V,\ 134 155 190 269 380 538 190 2 273 315 386 546 : 771 1,091 386 VA 449 518 635 898 1,270 1,797. 635 3 .822 948 1,163 1,645 2,326 3,289 1,129 3A 1,228 1,419 1,737 2,457 3,474 4,913 1,548 4 1,738 2,011 2,457 3,475 4,914 6,950 2,042 5 3,214 3,712 4,546 6,429 9,092 12,858 ____ _ 6 5,276 6,094 . 7,462 10,553 14,924 21,105 _____. 8 10,983 12,682 15,533 21,967 31,066 43,934 10 12 20,043 23,144 28,345 40,085 32,168 37,145 45,492 64,336 56,689 80,171 90,985 128,672 _____ ... 16 60,506 69,671 84,849 121,012 169,698 242,024 -- 26 58 95 195 395 700 1,150 1,700 3,150 ______ ______ -- 25 45 98 152 288 464 799 1,144 1,520 ,,,,.... ____ __ ______ ______ __ ____ -- '20 55 81 165 . ___ __ -1- , J_____ ______ ______ ___ ^ -- 20 55 81 165 260 475 745 1,110 2,180 ______ ------- All Horizontal Mains and Down-Feed Risers JpFeed Risers Mains and Un dripped Run outs UpFeed Risers Radiator Cod- nections Run outs Not Dripped Note.--All drops shown are in pounds per 100 ft of equivalent run--based on pipe properly reamed. Do not use Column H for drops of 1/24 or 1/32 lb; substitute Column C or Column B as required. bDo not use Column J for drop of 1/32 lb except on sizes 3 in. and over; below 3 in. substitute Column B. eOn radiator runouts over 8 ft long increase one pipe size over that shown in Table 6. MdAh* f American Society or Heating and Ventilating Engineers ) Not to be Reprinted WlthtjOpyngnt | Heating, Piping and Air Conditioning Contractors National Association J out Special Permission 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 reaming 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 Laboratoiy 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. 293 X