Trane YSC037E Installation, Operation And Maintenance Manual page 41

Table 7. Temperature vs. resistance
Temperature
Degrees F° Degrees C°
-20° -28.9°
-15° -26.1°
-10° -23.3°
-5° -20.6°
0° -17.8°
5° -15.0°
10° -12.2°
15° -9.4°
20° -6.7°
25° -3.8°
30° -1.1°
35° 1.7°
40° 4.4°
45° 7.2°
50° 10.0°
55° 12.8°
60° 15.6°
65° 18.3°
70° 21.1°
75° 23.9°
80° 26.7°
85° 29.4°
90° 32.2°
95° 35.0°
Table 8. Sizing natural gas pipe mains and branches
Iron Pipe Size (IPS) Inches
½"
Length of Pipe (Ft.) Pipe
15 76
30 52
45 43
60 38
75
Note: Capacity of Pipe of Different Diameters and Lengths in Cu. Ft. Per Hr.
with Pressure Drop of 0.3" and Specific Gravity of 0.60
RT-SVX21N-EN
Nominal Resistance
170.1 K - Ohms
143.5 K - Ohms
121.4 K - Ohms
103.0 K - Ohms
87.56 K - Ohms
74.65 K - Ohms
63.80 K - Ohms
54.66 K - Ohms
46.94 K - Ohms
40.40 K - Ohms
34.85 K - Ohms
30.18 K - Ohms
26.22 K - Ohms
22.85 K - Ohms
19.96 K - Ohms
17.47 K - Ohms
15.33 K - Ohms
13.49 K - Ohms
11.89 K - Ohms
10.50 K - Ohms
9.297 K - Ohms
8.247 K - Ohms
7.330 K - Ohms
6.528 K - Ohms
¾" 1" 1¼" 1½"
Pipe Pipe Pipe Pipe
176 345 750 1220
120 241 535 850
99 199 435 700
86 173 380 610
77 155 345 545
Table 9. Iron pipe size (SI) millimeters
Iron Pipe Size (SI) Millimeters
Length of Pipe 15 mm
(Meters) Pipe
4.6 2.15
9.1 1.47
13.7 1.21
18.3 1.07
22.9 —
Note: Capacity of Pipe of Different Diameters and Lengths in Cu. Meter Per
Hr. with Pressure Drop of 74.6 Pa and Specific Gravity of 0.60.
Figure 55. Schematic diagram for field gas piping to
unit
Installation
20 mm 25 mm 32 mm 40 mm
Pipe Pipe Pipe Pipe
4.98 9.76 21.23 34.54
3.39 6.82 15.14 24.06
2.80 5.63 12.31 19.82
2.43 4.89 10.76 17.27
2.18 4.38 9.76 15.40
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