How to Trap Steam Distribution Systems - Armstrong International, Inc.
How to Trap Steam Distribution Systems - Armstrong International, Inc.
How to Trap Steam Distribution Systems - Armstrong International, Inc.
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<strong>How</strong> <strong>to</strong> <strong>Trap</strong> Space Heating EquipmentTable CG-16. A Table of Constants for determining the Btu output of a unit heater with conditions other than standard — standard being with 2 lbssteam pressure at 60°F entering air temperature. To apply, multiply the standard Btu capacity rating of heater by the indicated constant. (Reprinted fromASHRAE Guide by special permission.)<strong>Steam</strong> Pressurelbs Persq inLatent Hea<strong>to</strong>f <strong>Steam</strong>Entering Air Temperature °F-10 0 10 20 30 40 50 60 70 80 90 1002 966.3 — — — — — 1.155 1.078 1.000 0.926 0.853 0.782 0.7135 960.7 1.640 1.550 1.456 1.370 1.289 1.206 1.127 1.050 0.974 0.901 0.829 0.76010 952.4 1.730 1.639 1.545 1.460 1.375 1.290 1.211 1.131 1.056 0.982 0.908 0.83815 945.5 1.799 1.708 1.614 1.525 1.441 1.335 1.275 1.194 1.117 1.043 0.970 0.89720 939.3 1.861 1.769 1.675 1.584 1.498 1.416 1.333 1.251 1.174 1.097 1.024 0.95230 928.5 1.966 1.871 1.775 1.684 1.597 1.509 1.429 1.346 1.266 1.190 1.115 1.04240 919.3 2.058 1.959 1.862 1.771 1.683 1.596 1.511 1.430 1.349 1.270 1.194 1.11950 911.2 2.134 2.035 1.936 1.845 1.755 1.666 1.582 1.498 1.416 1.338 1.262 1.18760 903.9 2.196 2.094 1.997 1.902 1.811 1.725 1.640 1.555 1.472 1.393 1.314 1.23970 897.3 2.256 2.157 2.057 1.961 1.872 1.782 1.696 1.610 1.527 1.447 1.368 1.29375 893.8 2.283 2.183 2.085 1.990 1.896 1.808 1.721 1.635 1.552 1.472 1.392 1.31680 891.1 2.312 2.211 2.112 2.015 1.925 1.836 1.748 1.660 1.577 1.497 1.418 1.34290 885.4 2.361 2.258 2.159 2.063 1.968 1.880 1.792 1.705 1.621 1.541 1.461 1.383100 880.0 2.409 2.307 2.204 2.108 2.015 1.927 1.836 1.749 1.663 1.581 1.502 1.424Table CG-17. Finned Radiation Conversion Fac<strong>to</strong>rs for steam pressuresand air temperatures other than 65°F air and 215°F steam.<strong>Steam</strong>Pressure(psig)<strong>Steam</strong> Temp.(°F)Entering Air Temperature °F45 55 65 70 75 80 90.9 215.0 1.22 1.11 1.00 .95 .90 .84 .755 227.1 1.34 1.22 1.11 1.05 1.00 .95 .8110 239.4 1.45 1.33 1.22 1.17 1.11 1.05 .9115 249.8 1.55 1.43 1.31 1.26 1.20 1.14 1.0030 274.0 1.78 1.66 1.54 1.48 1.42 1.37 1.2160 307.3 2.10 2.00 1.87 1.81 1.75 1.69 1.51100 337.9 2.43 2.31 2.18 2.11 2.05 2.00 1.81125 352.9 2.59 2.47 2.33 2.27 2.21 2.16 1.96175 377.4 2.86 2.74 2.60 2.54 2.47 2.41 2.21Table CG-18. Condensing Rates in Bare Pipe Carrying Saturated <strong>Steam</strong><strong>Steam</strong> Pressure (psig)Temp. Rise From 70°Pounds of Condensate Per hr Per Lineal ftPipe Size(in)sq ft PerLineal ft15180°30204°60237°125283°180310°250336°1/2 .220 .13 .15 .19 .26 .30 .353/4 .275 .15 .19 .24 .33 .38 .451 .344 .19 .23 .28 .39 .46 .541-1/4 .434 .23 .28 .36 .49 .57 .671-1/2 .497 .26 .32 .41 .55 .65 .762 .622 .33 .40 .50 .68 .80 .932-1/2 .753 .39 .47 .59 .81 .95 1.113 .916 .46 .56 .70 .96 1.13 1.313-1/2 1.047 .52 .63 .80 1.08 1.27 1.504 1.178 .58 .70 .89 1.21 1.43 1.72Table CG-19. Finned Radiation Condensing Rates with 65°F air and 215°Fsteam (for trap selection purposes only).Steel Pipe,Steel FinsPaintedBlackCopper PipeAluminumFinsUnpaintedPipeSize (in)1-1/4Fin Size(in)Fins Per<strong>Inc</strong>h1-1/4 3-1/4 3 <strong>to</strong> 421-1/41-1/44-1/44-1/43-1/44-1/43<strong>to</strong>42<strong>to</strong>345No.ofPipesHigh on6'' CentersCondensatelbs/hr PerFoot of Pipe1 1.12 2.03 2.61 1.62 2.43 3.11 1.52 2.43 3.11 1.62 2.23 2.81 2.22 3.03 3.632CG-27<strong>Armstrong</strong> <strong>Steam</strong> and Condensate Group, 816 Maple St., P.O. Box 408, Three Rivers, MI 49093 – USA Phone: (269) 273-1415 Fax: (269) 278-6555www.armstrong-intl.com
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