AG 31-011 • REFRIGERANT PIPING DESIGN 46 www.DaikinApplied.com
Table 11: R-22 Minimum Capacity for Suction Riser (Tons)
Saturated
Suction
Temp
Suction
Gas
Temp
Pipe O.D. (inches)
(°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
-40
-30 0.067 0.119 0.197 0.298 0.580 0.981 1.52 3.03 5.20 8.12 11.8 16.4
-10 0.065 0.117 0.194 0.292 0.570 0.963 1.49 2.97 5.11 7.97 11.6 16.1
10 0.066 0.118 0.195 0.295 0.575 0.972 1.50 3.00 5.15 8.04 11.7 16.3
-20
-10 0.087 0.156 0.258 0.389 0.758 1.28 1.98 3.96 6.80 10.6 15.5 21.5
10 0.085 0.153 0.253 0.362 0.744 1.26 1.95 3.88 6.67 10.4 15.2 21.1
30 0.086 0.154 0.254 0.383 0.747 1.26 1.95 3.90 6.69 10.4 15.2 21.1
0
10 0.111 0.199 0.328 0.496 0.986 1.63 2.53 5.04 8.66 13.5 19.7 27.4
30 0.108 0.194 0.320 0.484 0.842 1.59 2.46 4.92 8.45 13.2 19.2 26.7
50 0.109 0.195 0.322 0.486 0.946 1.60 2.47 4.94 8.48 13.2 19.3 26.8
20
30 0.136 0.244 0.403 0.608 1.18 2.00 3.10 6.18 10.6 16.6 24.2 33.5
50 0.135 0.242 0.399 0.603 1.17 1.99 3.07 6.13 10.5 16.4 24.0 33.3
70 0.135 0.242 0.400 0.605 1.18 1.99 3.08 6.15 10.6 16.5 24.0 33.3
40
50 0.167 0.300 0.495 0.748 1.46 2.46 3.81 7.6 13.1 20.4 29.7 41.3
70 0.165 0.296 0.488 0.737 1.44 2.43 3.75 7.49 12.9 20.1 29.3 40.7
90 0.165 0.296 0.488 0.738 1.44 2.43 3.76 7.50 12.9 20.1 29.3 40.7
ASHRAE Handbook Refrigeration, Chapter 2, 2006.
© American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., www.ashrae.org
Refrigeration capacity in tons is based on 90°F liquid temperature and superheat as indicated by the listed temperature. Multiply
table capacities by the following factors for other liquid line temperatures.
Liquid Temperature (°F)
50 60 70 80 100 110 120 130 140
1.17 1.14 1.10 1.06 0.98 0.94 0.89 0.85 0.80
Table 12: R-134a Minimum Capacity for Suction Riser (Tons)
Saturated
Suction
Temp
Suction
Gas
Temp
Pipe O.D. (inches)
(°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
-40
-30 0.089 0.161 0.259 0.400 0.78 1.32 2.03 4.06 7.0 10.9 15.9 22.1
-10 0.075 0.135 0.218 0.336 0.66 1.11 1.71 3.24 5.9 9.2 13.4 18.5
10 0.072 0.130 0.209 0.323 0.63 1.07 1.64 3.28 5.6 8.8 12.8 17.8
-20
-10 0.101 0.182 0.294 0.453 0.88 1.49 2.31 4.61 7.9 12.4 18.0 25.0
10 0.084 0.152 0.246 0.379 0.74 1.25 1.93 3.86 6.6 10.3 15.1 20.9
30 0.081 0.147 0.237 0.366 0.71 1.21 1.87 3.73 6.4 10.0 14.6 20.2
0
10 0.113 0.205 0.331 0.510 0.99 1.68 2.6 5.19 8.9 13.9 20.3 28.2
30 0.095 0.172 0.277 0.427 0.83 1.41 2.17 4.34 7.5 11.6 17.0 23.6
50 0.092 0.166 0.268 0.413 0.81 1.36 2.1 4.20 7.2 11.3 16.4 22.8
20
30 0.115 0.207 0.335 0.517 1.01 1.7 2.63 5.25 9.0 14.1 20.5 28.5
50 0.107 0.193 0.311 0.480 0.94 1.58 2.44 4.88 8.4 13.1 19.1 26.5
70 0.103 0.187 0.301 0.465 0.91 1.53 2.37 4.72 8.1 12.7 18.5 25.6
40
50 0.128 0.232 0.374 0.577 1.12 1.9 2.94 5.87 10.1 15.7 22.9 31.8
70 0.117 0.212 0.342 0.528 1.03 1.74 2.69 5.37 9.2 14.4 21.0 29.1
90 0.114 0.206 0.332 0.512 1.00 1.69 2.61 5.21 8.9 14.0 20.4 28.3
ASHRAE Handbook Refrigeration, Chapter 2, 2006.
© American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., www.ashrae.org
Refrigeration capacity in tons is based on 90°F liquid temperature and superheat as indicated by the listed temperature. Multiply
table capacities by the following factors for other liquid line temperatures.
Liquid Temperature (°F)
50 60 70 80 100 110 120 130 140
1.26 1.20 1.13 1.07 0.94 0.87 0.80 0.74 0.67
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