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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.
T
P
ANKS AND
IPING
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
®
®
See Typical Propane Gas Piping figure for typical piping arrangement.
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
ELECTRICAL WIRING
T
L
HERMOSTAT
OCATION
Mount the thermostat approximately five feet above the floor, in an area that has an inside, vibration-free wall and has good air
circulation.
Movement of air must not be obstructed by furniture, door, draperies, etc. The thermostat must not be mounted where it will be
affected by drafts, hot or cold water pipes or air ducts in walls, radiant heat from fireplace, lamps, the sun, television, etc. Consult
the Instruction Sheet packaged with thermostat for mounting instructions.
or John Crane
are satisfactory.
®
®
NOMINAL PIPE SIZE,
SCHEDULE 40
5/8"
3/4"
7/8"
1/2"
1,303
2,205
3,394
1,843
1,115
1,887
2,904
1,577
988
1,672
2,574
1,398
896
1,515
2,332
1,267
824
1,394
2,146
1,165
767
1,297
1,996
1,084
719
1,217
1,873
1,017
679
1,149
1,769
961
546
923
1,421
772
467
790
1,216
660
414
700
1,078
585
378
634
976
530
345
584
898
488
321
543
836
454
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
LENGTH,
3/4"
FEET
3/8"
3,854
10
49
3,298
20
34
2,923
30
27
2,649
40
23
2,437
50
20
2,267
60
19
2,127
2,009
80
16
1,613
100
14
1,381
125
12
1,224
150
11
1,109
200
10
1,020
250
9
949
300
8
350
7
400
7
*DATA IN ACCORDANCE WITH NFPA PAMPHLET NO. 54
Propane Gas Pipe Sizing
8
5 to 15 PSIG
First Stage
(20 PSIG Max.)
Regulator
200 PSIG
Maximum
Typical Propane Gas Piping
TUBING SIZE, O.D., TYPE L
1/2"
5/8"
3/4"
7/8"
1/2"
110
206
348
539
291
76
141
239
368
200
61
114
192
296
161
52
97
164
253
137
46
86
146
224
122
42
78
132
203
110
36
67
113
174
94
32
59
100
154
84
28
52
89
137
74
26
48
80
124
67
22
41
69
106
58
19
36
61
94
51
18
33
55
85
46
16
30
51
78
43
15
28
47
73
40
Continuous
11" W.C.
Second Stage
Regulator
NOMINAL PIPE SIZE,
SCHEDULE 40
3/4"
1"
1-1/4"
1-1/2"
608
1,146
2,353
3,525
418
788
1,617
2,423
336
632
1,299
1,946
284
541
1,111
1,665
255
480
985
1,476
231
436
892
1,337
198
372
764
1,144
175
330
677
1,014
155
292
600
899
141
265
544
815
120
227
465
697
107
201
412
618
97
182
374
560
89
167
344
515
83
156
320
479
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