Document LKvJokNjYodL3y07LDQ1jB6Lb

146 Am. Soc. or Heat.-Vent. Engineers Guide. 1922 Flow of Steam in Pipes Pressure Drop in 87 V PrP Ounces V 100 1 2.175 2 3.076 3 3.767 4 4.350 5 4.863 6 5.328 7 5.754 8 6.152 10 6.878 12 7.534 14 8.138 16 8.700 20 9.727 24 10.655 28 11.509 32 12.290 40 13.756 48 15.069 80 19.454 160 27.512 320 38.863 480 47.652 \f[aside Dia. Pipe D Inches 1 lA iA 2 ' 2'A 3 3A 4 4A 5 6 7 8 9 10 12 * 14 16 .522 1.177 1.828 3.709 6.109 11.183 16.705 23.630 32.098 43.719 69.718 105.35 150.33* 205.37 271.16 437.51 733.90 925.19 Steam Pressure \f Densv ity Length Pipe in Inches J 100 Length 0 .3 1.3 2.3. 5.3 10.3 15.3 20.3 30.3 40.3 50.3 60.3 75.3 100.3 125.3 150.3 175.3 200.3 .193 .195 .201 .207 .223 .248 .270 .290 .326 .358 .388 .415 .452 .507 .557 .603 .645 .648 20 40 60 80 100 120 140 160 180 200 250 300 350 400 450 500 600 700 800 900 1000 1400 2.240 1.580 1.290 1.120 1.000 .912 .841 .793 .741 .710 .632 .578. .538 .500 .477 .447 .407 .378 .354 .333 .316 .267 4 35BXXn P'm'?irU|K throll*h Pte 'or a Riven condition. Example 4.^X11.183X223X1.00=10.84 lbs. per minute--10.84X60 = 650.4 lbs. per hour. p = Drop in pressure in ibs. d -inside dia. pipe in inches L -- Length of pipe in feet D -- Density of steam percu.ft. W--lbs. of steam per minute w- /-p-gl1 . V(.+V6)^ P- .00013l(,+31S)^. Am. Soc. of Heat.-Vent. Engineers Guide, 1922 METHODS OF EQUALIZING BOILERS sDr/p " ' * 147 ALTERNATE METHOD OF VALVING Y^-Wet Return ^ Check Vatve 'Return Header on hotter METHOD OF EQUAL!Z/H6 TWO OR MPRE BOILERS WATER HAMMER Water hammer in steam pipes is caused by condensation in the pipe forming waves and allowing pockets to form holding steam--similar to A. The air around the pipe being cooler than the steam causes the steam to condense, thereby making a vacuum which pulls the water B>-B together with a slap or bang. If the pipe is large enough to permit the steam to travel at a low velocity it will not pick up the water and form waves; like the above drawing and water hammer will not occur.