Document 6w3r12y2pNvgwNBGyJejGRX1d

8ATUAATD STEAM PRESSURE P S IG I1 PRESSURE D R O P -P S I PER 100. FT 92 CHAPTER 6 1962 . Guide And Data Book PRESSURE. OftOP OUNCES PER SQ IN. PER 100 F T- Based on Moody FrktioP Factor where flow of condensate does oof infubit Am flow of steam. Fig. 22.... Basic CHarl for Weight-Row Rate and Velocity of Steam in Schedule 40 Pipe Based on Saturation Pressure of 0 Psig (With Muiljpllir Cborfr for Obtaining Weight-How Kate* and Voloc&e* at All Saturation fmww fletween 0 and 200 Ftigl Steam Heating Systems . Bg. 22 (Continued).... Velocity Multiplier Chart 93 Example of Use of Basic and Velocity Multiplier Charts. Given: . Weight-Flow Rate TM 6700 lb per hr. . Initial Steam Pressure " 100 psig. e. Pressure Drop = 11 psi per 100 ft. Find; o. Siie of Schedule 40 pipe required. b. Velocity.of steam ia pipe. Solution.* The following steps are illustrated by the broken line on Fig. 22: Step I. Enter Fig. 22 at a weight-flow rate of 67001b per hr and more vertically to the horixontal line at 100 psig. Step 2. Follow along inclined multiplier line (upward and to the left) to horuont&l 0 psig line. The equivalent weight flow at 0 psig is about 2500 lb per hr. Step S. Follow the 2500 lb per hr line vertically until it inter sects the horisontal line at 11 psi per 100 ft pressure drop. The nominal pipe site is 2)4 in. The equivalent steam velocity at 0 psig is.about 32,700 fpm. Step 4. To find the steam velocity at 100 psig, locate the value of 32,700 fpm on the ordinate of the velocity multiplier chart at 0 psig. Step 6. Move along the inclined multiplier line (downward and to the right) until it intersects the vertical 100 psig pres sure line. The velocity as read from the right (or left) scale is about 13,000 fpm. Note: The preceding Steps 1 to S would be rearranged or reversed if different data were given. Table 5.... Weight Flow Rate of Steam in Schedule-40 Pipe* at Initial Saturation Pressures of 3-5 and 12 Psig.b-" (Weight Haw Kate Expressed In Found* per How) Pressure Orop--Pa Far IDO H in length Nos. Pipe She behot KN0oi} Sol press, ptlg ' X P*1 (2 Oil Sot pr *. Pfig X Psi (4 ox) Sal press piig. X M (8 ox) Sal press, psig K Pd (12 ax) Sat. press, psig. 1 Pd Sat. press, psig 2 Pri Sot. press, psig 3.5 12 3.5 12 3.5 12 3.5 12 XS 12 3.5 12 3.5 12 H 0 11 14 16 20 24 29 35 36 43 42 50 60 73^ 1 17 21 26 31 37 46 54 66 68 82 81 95 114 137 IX 36j 46 53 66 78 96 111 138 140 170 162 200 232 280 IX 66 70 84 100 120 147. 174 210 218 260 246 304 360 430 2 108 134 162 194 234 285 336 410 420 510 480 590 710 850 2H 174 215 258 310 378 460 540 660 680 820 780 950 1150 1370 3 318 380 465 550 600 810 960 1160 1190 1430 1380 1670 1950 2400 3K 462 650 670 800 990 1218 1410 1700 1740 2100 2000 2420 2950 3450 4 640 800 - 950 1160 1410 1690 1980 2400 2450 3000 ' 2880 3460 4200 4900 5 1200 1430 1680 2100 2440 3000 3570 4250 4380 5250 5100 6100 7500 8600 6 1920 2300 2820 3350 3960 4850 5700 7000 7200 8600 8400 10,000 11,900 14,200 8 3900 4800 5570 7000 8100 10,000 11,400 14,300 14,500 17,700 16,500 20,500 24,000 29,500 10 7200 8800 10,200 12,600 15,000 18,200 21,000 26,000 26,200 32,000 30,000 37.000 42,700 52,000 11,400 13,700 16,500 19,500 23,400 28,400 33,000 40,000 41,000 49;500 48,000 57,500 67,800 81-f000 Beeed on Uoody Friction Factor, wtare flow of condensate does oot inhibit the flow of itoio. The weight-flow rates at 9.6 psig can be need to cover eat. press, from 1 to S psig. sad tbs rates at 13 psig eas be need to coversat. press, from 8 to IS psig with an trar not TiTfrcitim S percent. The steam velocities ---**|*--^;-r to the weight-flow ratee given is this table can be found from the baaio chartand vdodty multiplier chart. Fig. 33.