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Propane Gas Installations
IMPORTANT NOTE: Propane gas conversion kits must be
installed to convert units to propane gas. Refer to the gas
piping section for the correct LP kit for conversion.
All propane gas equipment must conform to the safety
standards of the National Board of Fire Underwriters (See
NBFU Manual 58).
For satisfactory operation, propane gas supply pressure
must be within 9.7 - 10.3 inches W.C. at the manifold with
all gas appliances in operation. Maintaining proper gas
pressure depends on three main factors:
1. Vaporization rate, which depends on (a) temperature of
the liquid, and (b) wetted surface area of the container
or containers.
2. Proper pressure regulation.
3. Pressure drop in lines between regulators, and
between second stage regulator and the appliance.
Pipe size required will depend on length of pipe run
and total load of all appliances.
Tanks and Piping
Complete information regarding tank sizing for vaporization,
recommended regulator settings and pipe sizing is
available from most regulator manufacturers and propane
gas suppliers.
Since propane gas will quickly dissolve white lead or most
standard commercial compounds, special pipe dope must
be used. Shellac base compounds resistant to the actions
of liquefied petroleum gases such as Gasolac®, Stalactic®,
Clyde's® or John Crane® are satisfactory.
See following graphic for typical propane gas piping.
First Stage
Regulator
200 PSIG
Maximum
Typical Propane Gas Piping
Sizing Between First and Second Stage Regulator
Maximum Propane Capacities listed are based on 1 PSIG Pressure Drop at 10
PSIG Setting. Capacities in 1,000 BTU/HR
PIPE OR
TUBING
TUBING SIZE, O.D., TYPE L
LENGTH,
FEET
3/8"
1/2"
30
309
700
40
265
599
50
235
531
60
213
481
70
196
446
80
182
412
90
171
386
100
161
365
150
130
293
200
111
251
250
90
222
300
89
201
350
82
185
400
76
172
To convert to Capacities at 15 PSIG Settings -- Multiply by 1.130
To convert to Capacities at 5 PSIG Settings -- Multiply by 0.879
Sizing Between Single or Second Stage Regulator and Appliance*
Maximum Propane Capacities Listed are Based on 1/2" W.C. Pressure Drop at
11" W.C. Setting. Capacities in 1,000 BTU/HR
PIPE OR
TUBING SIZE, O.D., TYPE L
TUBING
LENGTH,
FEET
3/8"
1/2"
5/8"
10
49
110
206
20
34
76
141
30
27
61
114
40
23
52
97
50
20
46
86
60
19
42
78
80
16
36
67
100
14
32
59
125
12
28
52
150
11
26
48
200
10
22
41
250
9
19
36
300
8
18
33
350
7
16
30
400
7
15
28
*DATA IN ACCORDANCE WITH NFPA PAMPHLET NO. 54
9
5 to 15 PSIG
(20 PSIG Max.)
Continuous
11" W.C.
Second Stage
Regulator
NOMINAL PIPE SIZE,
5/8"
3/4"
7/8"
1,303
2,205
3,394
1,115
1,887
2,904
988
1,672
2,574
896
1,515
2,332
824
1,394
2,146
767
1,297
1,996
719
1,217
1,873
679
1,149
1,769
546
923
1,421
467
790
1,216
414
700
1,078
378
634
976
345
584
898
321
543
836
NOMINAL PIPE SIZE,
SCHEDULE 40
3/4"
7/8"
1/2"
3/4"
1"
348
539
291
608
1,146
239
368
200
418
788
192
296
161
336
632
164
253
137
284
541
146
224
122
255
480
132
203
110
231
436
113
174
94
198
372
100
154
84
175
330
89
137
74
155
292
80
124
67
141
265
69
106
58
120
227
61
94
51
107
201
55
85
46
97
182
51
78
43
89
167
47
73
40
83
156
SCHEDULE 40
1/2"
3/4"
1,843
3,854
1,577
3,298
1,398
2,923
1,267
2,649
1,165
2,437
1,084
2,267
1,017
2,127
961
2,009
772
1,613
660
1,381
585
1,224
530
1,109
488
1,020
454
949
1-1/4"
1-1/2"
2,353
3,525
1,617
2,423
1,299
1,946
1,111
1,665
985
1,476
892
1,337
764
1,144
677
1,014
600
899
544
815
465
697
412
618
374
560
344
515
320
479
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