Document 0XkMvBGNLo63Gge49G44j1LO

PRESSURE O R O P -P S I PER IOO FT PRESSURE D R O P -O U N C E S PER SQ IN. PER 100 FT 364 CHAPTER 26 1959 Guide Bated on Moody Friction Factor whoto flow of condensate doei not inhibit (he flow of doom. Rg. 22.... Basic Chart for Weight-Row Rate and Velocity of Steam in Schedule 40 Pipe Based on Saturation Pressure of 0 Psig (With Multiplier Chart* for Obtaining Weight-Flow Rate* end Velocities of All Saturation Pressure* Bo(ween 0 and 200 Fag) Steam Heating Systems Rg. 22 (Continued).... Velocity Multiplier Chart 365 Example of Use of Basic and Velocity Multiplier Charts. Given: a. Weight-Flow Kate = 6700 lb per hr. b. Initial Steam Pressure -* 100 psig. c. Pressure Drop = 11 psi per 100 ft. Find; o. Siee <ft Schedule 40 pipe required. 6. Velocity of steam in pipe. Solution: The following steps are illustrated by the broken line on Fig. 22: Step 1. Enter Fig. 22 at a weight-flow rate of 6700 lb per hr and move vertically to the horizontal line at 100 psig. Step X. Follow along inclined multiplier line (upward and to the left) to horizontal 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 horizontal line at 11 psi per 100 ft pressure drop. The nominal pipe size is 2% 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 5 would be rearranged or reversed if different data were given. Table 5....Weight Row Rate of Steam in Schedule 40 Pipe* at Initial Saturation Pressures of 3.5 and 12 Psig.b>0 {Weight Hw Bata Expressed in Pound* par Hoor) Pressure Drop--Fd For 400 Ft m length Near, ftps Size Indies Ke Psi 0 ori Sot. press, psig X Psi (2 ox) Sat. press, psig K P*i W ox) Sat. press psig. X ftl [8 oz) Sat. press, psig KPsHl2ox) Sat. press, psig. 1 Psi Sat. press, psig 2 Psi Sat. press, psig 3.5 12 3.5-" 12 3.5 12 3.5 12 3.5 . 12 3.5 12 3.5 12 H 1 IK iH 2 2M 3 3K 4 5 6 8 10 12 9 11 14 16 20 24 29 35, 36 43 42 50 60 73 17 21 26 31 37 46 54 66 68 82 81 95 114 137 36 45 53 66 78 96 111 138 140 170 162 200 232 280 56 70 84 100 120 147 174 210 218 ( 260 246 304 360 430 108 174 318 462 134 215 380 550 162 258 465 670 194 310 550 800 234 378 660 . 990 285 460 810 1218 336 540 960 1410 410 660 1160 1700 420 680 1190 1740 510 820 1430 2100 480 780 1380 2000 590 950 1670 2420 710 1150 1950 2950 850 1370 2400 3450 726 1200 1920 3900 800 1430 2300 4800 950 1680 2820 5570 1160 2100 3350 7000 1410 2440 3960 8100 1690 3000 4850 10,000 1980 3570 5700 11,400 2400 4250 7000 14,300 2450 4380 7200 14,500 3000 5250 8600 17,700 2880 5100 8400 16,500 3460 6100 10,000 20,500 4200 7500 11,900 24,000 4900 8600 14,200 29,500 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 81,000 " Baaed an Moody Friction Factor, where flow of condensate doea not inhibit the flow of steam. The weight-flow rates at 3.S psig can be used to cover sat. press. (ram 1 to B psig, and themteaat IS psig can be used to cover sat. press- from 8 to 18 psig with an * The steam velocities corresponding to the weight-flow rates given in this table ean be found from the basic chart and velocity multiplier chart. Fig. 22.