Installation
48 RT-SVX21AC-EN
Table 13. Temperature vs. resistance
Temperature
Degrees °F Degrees °C Nominal Resistance
-20° -28.9° 170.1 K - Ohms
-15° -26.1° 143.5 K - Ohms
-10° -23.3° 121.4 K - Ohms
-5° -20.6° 103.0 K - Ohms
0° -17.8° 87.56 K - Ohms
5° -15.0° 74.65 K - Ohms
10° -12.2° 63.80 K - Ohms
15° -9.4° 54.66 K - Ohms
20° -6.7° 46.94 K - Ohms
25° -3.8° 40.40 K - Ohms
30° -1.1° 34.85 K - Ohms
35° 1.7° 30.18 K - Ohms
40° 4.4° 26.22 K - Ohms
45° 7.2° 22.85 K - Ohms
50° 10.0° 19.96 K - Ohms
55° 12.8° 17.47 K - Ohms
60° 15.6° 15.33 K - Ohms
65° 18.3° 13.49 K - Ohms
70° 21.1° 11.89 K - Ohms
75° 23.9° 10.50 K - Ohms
80° 26.7° 9.297 K - Ohms
85° 29.4° 8.247 K - Ohms
90° 32.2° 7.330 K - Ohms
95° 35.0° 6.528 K - Ohms
Table 14. Sizing natural gas pipe mains and branches
Iron Pipe Size (IPS) Inches
Length of Pipe (Ft.)
½"
Pipe
¾"
Pipe
1"
Pipe
1¼"
Pipe
1½"
Pipe
15 76 176 345 750 1220
30 52 120 241 535 850
45 43 99 199 435 700
60 38 86 173 380 610
75 77 155 345 545
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
Table 15. Iron pipe size (SI) millimeters
Iron Pipe Size (SI) Millimeters
Length of Pipe
(Meters)
15 mm
Pipe
20 mm
Pipe
25 mm
Pipe
32 mm
Pipe
40 mm
Pipe
4.6 2.15 4.98 9.76 21.23 34.54
9.1 1.47 3.39 6.82 15.14 24.06
13.7 1.21 2.80 5.63 12.31 19.82
18.3 1.07 2.43 4.89 10.76 17.27
22.9 — 2.18 4.38 9.76 15.40
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 73. Schematic diagram for field gas piping to
unit
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