Trane Precedent YSJ072 Installation, Operation And Maintenance Manual page 49

Table 11. Temperature vs. resistance (continued)
Temperature
Degrees °F Degrees °C
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 12. Sizing natural gas pipe mains and branches
Iron Pipe Size (IPS) Inches
Length
1/2-in. 3/4-in.
of Pipe
Pipe Pipe
(Ft.)
15 76 176
30 52 120
45 43 99
60 38 86
75 - 77
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.
RT-SVX071D-EN
Nominal Resistance
(kOhms)
19.96
17.47
15.33
13.4
11.89
10.50
9.297
8.247
7.330
6.528
1-in. 1¼-in. 1½-in.
Pipe Pipe Pipe
345 750 1220
241 535 850
199 435 700
173 380 610
155 345 545
Table 13. Iron pipe size (SI) millimeters
Iron Pipe Size (SI) Millimeters
Length of
15 mm 20 mm
Pipe
Pipe Pipe
(Meters)
4.6 2.15 4.98
9.1 1.47 3.39
13.7 1.21 2.80
18.3 1.07 2.43
22.9 — 2.18
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 71. Schematic diagram for field gas piping to
Units
Installation
25 mm 32 mm 40 mm
Pipe Pipe Pipe
9.76 21.23 34.54
6.82 15.14 24.06
5.63 12.31 19.82
4.89 10.76 17.27
4.38 9.76 15.40
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