66324-YIM-B-1004
10
Unitary Products Group
.
i
FIGURE 5 - EXTERNAL SUPPLY CONNECTION
EXTERNAL SHUT-OFF
TABLE 5: NATURAL GAS PIPE SIZING CHART
1
1.
Maximum capacity of pipe in cubic feet of gas per hour (based
upon a pressure drop of 0.3 inch water column and 0.6 specific
gravity gas).
LENGTH
IN FEET
NOMINAL INCHES IRON PIPE SIZE
1/2”
3/4”
1”
1-1/4”
10
132
278
520
1,050
20
92
190
350
730
30
73
152
285
590
40
63
130
245
500
50
56
115
215
440
60
50
105
195
400
70
46
96
180
370
80
43
90
170
350
90
40
84
160
320
100
38
79
150
305
1 / 2 x 1 / 2 G A S C O C K
1 / 2 x 1 / 2 U N I O N
A U T O M A T I C
G A S V A L V E
D R I P L E G
1 / 2 - 1 4 N P T
TABLE 6: PROPANE (LP) GAS PIPE SIZING
CHART
1
1.
Maximum capacity of pipe in thousands of BTU per hour (based
upon a pressure drop of 0.5 inch water column).
LENGTH
IN FEET
NOMINAL INCHES IRON PIPE SIZE
1/2”
3/4”
1”
1-1/4”
10
275
567
1,071
2,205
20
189
393
732
1,496
30
152
315
590
1,212
40
129
267
504
1,039
50
114
237
448
913
60
103
217
409
834
70
96
196
378
771
80
89
185
346
724
90
83
173
322
677
100
78
162
307
630
If flexible stainless steel tubing is allowed by the
authority having jurisdiction, wrought iron or steel
pipe must be installed at the gas valve and extend
a minimum of two (2) inches outside of the unit
casing.
Natural gas may contain some propane. Propane
being a excellent solvent, will quickly dissolve
white lead or most standard commercial com-
pounds. Therefore, a special pipe dope must be
applied when wrought iron or steel pipe is used.
Shellac base compounds such as gaskoloc or sta-
lastic, and compounds such as rectorseal # 5,
Clyde’s or John Crane may be used.
