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Gas Piping Checks
T
O PREVENT PROPERTY DAMAGE OR P ERSONAL INJURY D UE T O FIRE, THE
FOLLOWING I NSTRUCTIONS M UST BE P ERFORMED R EGARDING G AS
CONNECTIONS AND PRESSURE T ESTING:
T
•
HE U NIT AND ITS G AS C ONNECTIONS M UST BE L EAK TESTED B EFORE
PLACING IN O PERATION.
B
ECAUSE O F THE DANGER O F EXPLOSION OR
FIRE, NEVER USE A MATCH OR O PEN FLAME T O TEST F OR L EAKS.
EXCEED S PECIFIED P RESSURES F OR T ESTING.
DAMAGE G AS V ALVE A ND C AUSE O VERFIRING WHICH MAY RESULT I N
PREMATURE HEAT E XCHANGE F AILURE.
T
•
HIS UNIT A ND ITS SHUT-OFF V ALVE M UST BE D ISCONNECTED F ROM
THE GAS SUPPLY DURING ANY PRESSURE TESTING OF THAT SYSTEM AT
TEST PRESSURES IN EXCESS OF 1/2
T
•
HIS UNIT M UST BE I SOLATED FROM T HE G AS SUPPLY SYSTEM B Y
CLOSING ITS MANUAL SHUT-OFF V ALVE D URING A NY P RESSURE
TESTING OF T HE G AS S UPPLY PIPING SYSTEM AT T EST PRESSURES
EQUAL TO O R LESS T HAN 1/2
O AVOID PROPERTY D AMAGE OR P ERSONAL INJURY
T
NO O PEN FLAME IN T HE V ICINITY DURING A IR B LEEDING.
There will be air in the gas supply line after testing for leaks on
a new installation. Therefore, the air must be bled from the line
by loosening the ground joint union until pure gas is expelled.
Tighten union and wait for five minutes until all gas has been
dissipated in the air. Be certain there is no open flame in the
vicinity during air bleeding procedure. The unit is placed in
operation by closing the main electrical disconnect switch for
the unit.
PROPANE GAS INSTALLATIONS
T
O AVOID PROPERTY DAMAGE, PERSONAL INJURY OR DEATH DUE TO F IRE
OR E XPLOSION C AUSED BY A P ROPANE G AS L EAK, INSTALL A G AS
DETECTING WARNING DEVICE.
OF O DORANT IN PROPANE GAS, A G AS D ETECTING W ARNING D EVICE
IS T HE O NLY RELIABLE W AY T O DETECT A P ROPANE G AS L EAK.
ONTACT A L OCAL P ROPANE G AS S UPPLIER ABOUT INSTALLING A
C
GAS DETECTING WARNING DEVICE.
IMPORTANT NOTE: Propane gas conversion kits must be
installed to convert units to propane gas.
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.
CAUTION
H
IGHER PRESSURE M AY
PSIG
P
(3.48 K
A).
PSIG
P
( 3.48 K
A).
WARNING
, BE S URE THERE IS
WARNING
S
INCE R UST CAN REDUCE T HE L EVEL
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 com mercial compounds, special pipe dope must
be used. Shellac base compounds resistant to the actions
of liquefied petroleum gases such as Gasolac
Clyde's
or John Crane
®
N
EVER
See below for typical propane gas piping.
First Stage
Regulator
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
LENGTH,
FEET
3/8"
30
309
40
265
50
235
60
213
70
196
80
182
90
171
100
161
150
130
200
111
250
90
300
89
350
82
400
76
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"
10
49
110
20
34
30
27
40
23
50
20
60
19
80
16
100
14
125
12
150
11
200
10
250
9
300
8
350
7
400
7
*DATA IN ACCORDANCE WITH NFPA PAMPHLET NO. 54
Table 3 - Propane Gas Pipe Sizing
9
are satisfactory.
®
5 to 15 PSIG
(20 PSIG Max.)
200 PSIG
Second Stage
Maximum
Regulator
Typical Propane Gas Piping
TUBING SIZE, O.D., TYPE L
1/2"
5/8"
3/4"
700
1,303
2,205
599
1,115
1,887
531
988
1,672
481
896
1,515
446
824
1,394
412
767
1,297
386
719
1,217
365
679
1,149
293
546
923
251
467
790
222
414
700
201
378
634
185
345
584
172
321
543
NOMINAL PIPE SIZE,
5/8"
3/4"
7/8"
1/2"
3/4"
206
348
539
291
608
76
141
239
368
200
418
61
114
192
296
161
336
52
97
164
253
137
284
46
86
146
224
122
255
42
78
132
203
110
231
36
67
113
174
94
198
32
59
100
154
84
175
28
52
89
137
74
155
26
48
80
124
67
141
22
41
69
106
58
120
19
36
61
94
51
107
18
33
55
85
46
16
30
51
78
43
15
28
47
73
40
, Stalactic
,
®
®
Continuous
11" W.C.
NOMINAL PIPE SIZE,
SCHEDULE 40
7/8"
1/2"
3/4"
3,394
1,843
3,854
2,904
1,577
3,298
2,574
1,398
2,923
2,332
1,267
2,649
2,146
1,165
2,437
1,996
1,084
2,267
1,873
1,017
2,127
1,769
961
2,009
1,421
772
1,613
1,216
660
1,381
1,078
585
1,224
976
530
1,109
898
488
1,020
836
454
949
SCHEDULE 40
1"
1-1/4"
1-1/2"
1,146
2,353
3,525
788
1,617
2,423
632
1,299
1,946
541
1,111
1,665
480
985
1,476
436
892
1,337
372
764
1,144
330
677
1,014
292
600
899
265
544
815
227
465
697
201
412
618
97
182
374
560
89
167
344
515
83
156
320
479
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