3
Gas connections
(continued)
19
Installation & Service Manual
TABLE - 3E
GAS PIPING SIZE CHART
Nominal
Iron Pipe
Size
Inches
Length of Pipe in Straight Feet
Maximum
Capacity of Pipe
in Thousands of
Btu/hr per hour
for gas pressures
of 13.5 Inches
Water Column
(0.5 PSIG) or less
and a pressure
drop of 0.5 Inch
Water Column
(Based on NAT
GAS, 1025 Btu/
hr per Cubic
Foot of Gas and
0.60 Specific
Gravity)
10
20
30
40
50
60
70
80
90
100
125
150
175
200
3/4
369
256
205
174
155
141
128
121
113
106
95
86
79
74
1
697
477
384
328
292
267
246
226
210
200
179
164
149
138
1 1/4
1,400
974
789
677
595
543
502
472
441
410
369
333
308
287
1 1/2
2,150
1,500
1,210
1,020
923
830
769
707
666
636
564
513
472
441
2
4,100
2,820
2,260
1,950
1,720
1,560 1,440 1,330
1,250
1,180
1,100
974
871
820
2 1/2
6,460
4,460
3,610
3,100
2,720
2,460 2,310 2,100
2,000
1,900
1,700 1,540 1,400
1,300
3
11,200
7,900
6,400
5,400
4,870
4,410 4,000 3,800
3,540
3,300
3,000 2,720 2,500
2,340
4
23,500 16,100 13,100 11,100 10,000 9,000 8,300 7,690
7,380
6,870
6,150 5,640 5,130
4,720
Gas Piping
GAS SHUTOFF VALVE
GAS VALVE
TRAP
(DRIP LEG)
Figure 3-1_Gas Line Connection
All gas connections must be made with pipe joint
com pound resistant to the action of liquefied pe tro leum and
natural gas. All piping must comply with local codes. Tubing
installations must com
ply with ap
proved standards and
practices. Reference FIG. 3-1 for a typical installation.
Install Piping to Control
1. The gas line should be a separate line direct
from the meter unless the existing gas line is of sufficient
capacity. Verify pipe size with your gas sup pli er.
2. Use new, properly threaded black iron pipe free from
chips. If tubing is used, make sure the ends are cut
squared, deburred and clean. All tubing bends must be
smooth and without deformation. Avoid flexible gas
connections. Internal diameter of flexible lines may not
provide proper volume of gas.
3.
Run pipe or tubing to the gas valve or manifold inlet. If
tubing is used, obtain a tube to pipe coupling to connect
the tubing to the gas valve or man i fold inlet.
4.
DO NOT OVER-TIGHTEN. Over-tightening may result in
damage to the gas valves. Valve distortion or malfunction
may result if the pipe is inserted too deeply into the gas
valve.
5.
Apply a moderate amount of good quality pipe compound
(DO NOT use Teflon tape) to pipe only, leaving two end
threads bare.
6.
Remove seal over gas valve or manifold inlet.
7.
Connect pipe to gas valve or manifold inlet. Use wrench
to square ends of the gas valve (FIG. 3-2).
Summary of Contents for CBN045
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