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AG 31-011 • REFRIGERANT PIPING DESIGN 48 www.DaikinApplied.com
Table 15: R-22 Minimum Capacity For Discharge Riser (Tons)
Saturated
Temp
Discharge
Gas Temp
Pipe O .D . (in)
(°F) (°F)
1/2 5/8 3/4 7/8 1-1/8 1-3/8 1-5/8 2-1/8 2-5/8 3-1/8 3-5/8 4-1/8
Area (in
2
)
0 .146 0 .233 0 .348 0 .484 0 .825 1 .256 1 .780 3 .094 4 .770 6 .812 9 .213 11 .970
80
110 0.235 0.421 0.695 1.050 2.03 3.46 5.35 10.70 18.3 26.8 41.8 57.9
140 0.223 0.399 0.659 0.996 1.94 3.28 5.05 10.10 17.4 27.1 39.6 54.9
170 0.215 0.385 0.635 0.960 1.87 3.16 4.89 9.76 16.8 26.2 38.2 52.9
90
120 0.242 0.433 0.716 1.060 2.11 3.56 5.50 11.00 18.9 29.5 43.0 69.6
150 0.226 0.406 0.671 1.010 1.97 3.34 5.16 10.30 17.7 27.6 40.3 55.9
180 0.216 0.387 0.540 0.956 1.88 3.18 4.92 9.82 16.9 26.3 38.4 53.3
100
130 0.247 0.442 0.730 1.100 2.15 3.83 5.62 11.20 19.3 30.1 43.9 60.8
160 0.231 0.414 0.884 1.030 2.01 3.40 5.26 10.50 18.0 28.2 41.1 57.0
190 0.220 0.394 0.650 0.982 1.91 3.24 3.00 9.96 17.2 26.8 39.1 54.2
110
140 0.251 0.451 0.744 1.120 2.19 3.70 5.73 11.40 19.6 30.6 44.7 62.0
170 0.235 0.421 0.693 1.050 2.05 3.46 3.35 10.70 18.3 28.6 41.8 57.9
200 0.222 0.399 0.658 0.994 1.94 3.28 5.06 10.10 17.4 27.1 39.5 54.8
120
150 0.257 0.460 0.760 1.150 2.24 3.78 5.85 11.70 20.0 31.3 45.7 63.3
180 0.239 0.428 0.707 1.070 2.08 3.51 5.44 10.80 18.6 29.1 42.4 58.9
210 0.225 0.404 0.666 1.010 1.96 3.31 5.12 10.20 17.6 27.4 40.0 55.5
ASHRAE Handbook Refrigeration, Chapter 2, 2006.
© American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., www.ashrae.org
Refrigeration capacity in tons based on saturated suction temperature of 20°F with 15°F superheat at indicated saturated
condensing temperature with 15°F sub-cooling. For other saturated suction temperatures with 15°F superheat, use correction
factors in the following table.
Saturated Suction Temperature (°F)
-40 -20 0 +40
0.92 0.95 0.97 1.02
Table 16: R-134a Minimum Capacity For Discharge Riser (Tons)
Saturated
Temp
Discharge
Gas Temp
Pipe O .D . (in)
(°F) (°F)
1/2 5/8 3/4 7/8 1-1/8 1-3/8 1-5/8 2-1/8 2-5/8 3-1/8 3-5/8 4-1/8
Area (in2)
0 .146 0 .233 0 .348 0 .484 0 .825 1 .256 1 .780 3 .094 4 .770 6 .812 9 .213 11 .970
80
110 0.199 0.36 0.581 0.897 1.75 2.96 4.56 9.12 15.7 24.4 35.7 49.5
140 0.183 0.311 0.535 0.825 1.61 2.72 4.20 8.39 14.4 22.5 32.8 45.6
170 0.176 0.318 0.512 0.791 1.54 2.61 4.02 8.04 13.8 21.6 31.4 43.6
90
120 0.201 0.364 0.587 0.906 1.76 2.99 4.61 9.21 15.8 24.7 36.0 50.0
150 0.184 0.333 0.538 0.830 1.62 2.74 4.22 8.44 14.5 22.6 33.0 45.8
180 0.177 0.32 0.516 0.796 1.55 2.62 4.05 8.09 13.9 21.7 31.6 43.9
100
130 0.206 0.72 0.600 0.926 1.8 3.05 4.71 9.42 16.2 25.2 36.8 51.1
160 0.188 0.34 0.549 0.848 1.65 2.79 4.31 8.62 14.8 23.1 33.7 46.8
190 0.180 0.326 0.526 0.811 1.58 2.67 4.13 8.25 14.2 22.1 32.2 44.8
110
140 0.209 0.378 0.610 0.942 1.83 3.10 4.79 9.57 16.5 25.7 37.4 52.0
170 0.191 0.346 0.558 0.861 1.68 2.84 4.38 8.76 15.0 23.5 34.2 47.5
200 0.183 0.331 0.534 0.824 1.61 2.72 4.19 8.38 14.4 22.5 32.8 45.5
120
150 0.212 0.383 0.618 0.953 1.86 3.14 4.85 9.69 16.7 26 37.9 52.6
180 0.194 0.351 0.566 0.873 1.7 2.88 4.44 8.88 15.3 23.8 34.7 48.2
210 0.184 0.334 0.538 0.830 1.62 2.74 4.23 8.44 14.5 22.6 33.0 45.8
Refrigeration capacity in tons based on saturated suction temperature of 20°F with 15°F superheat at indicated saturated
condensing temperature with 15°F subcooling. For other saturated suction temperatures with 15°F superheat, use correction
factors in the following table.
Saturated Suction Temperature (°F)
-40 -20 0 +40
— — -0.96 1.04