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Installation instructions
FOR NATURAL GAS
Maximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and a Pressure drop
of 0.3 in Water Column (0.75mbar).(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands.
Copper tubing is prohibited for use with Natural Gas in the Commonwealth of Massachusetts and not recommended
elsewhere.
Follow boxed numbers for piping just one GWH 1600 PS (example: ¾" B.I. Natural Gas pipe for 20 ft (6. 1 m). will
handle 190,000 btu's (55.7 kWh). For multiple appliances combine the total btu input load and then refer to
applicable chart below.
Nominal
Iron
Pipe
Internal
Size
Diameter
inches
inches
10
3/4
0.824
278
190
1
1.049
520
350
1 1/4
1.380
1050 730
Length of Flexible Corrugated Stainless Steel Tubing (CSST), Feet
Tube
size,
inches
EHD*
10
20
30
1/2
18 EHD 82
58
47
3/4
23 EHD 161 116
96
1
30 EHD 330 231
188
1 1/4
37 EHD 639 456
374
FOR LP GAS
Maximum Capacity of Pipe in Thousands of BTU per Hour of Undiluted Petroleum Gases (at 11 inches Water Column Inlet
Pressure) (Based on a Pressure Drop of 0.5 Inch Water Column).
N o m ina l
Iro n pipe
s ize
inc he s
10
20
30
1/2
291 200 160 137 122 110 94
3/4
608 418 336 287 255 231 197 175
1
1145 787 632 541 480 434 372 330
Maximum Capacity of Semi-Rigid copper Tubing in
Thousands of BTU per Hour of Undiluted Liquefied
Petroleum Gases (at 11 inches Water Column Inlet
Pressure).
(Based on a Pressure Drop of 0.5 Inch Water Column)
* Source National Fuel Gas Code NFPA 54, ANSI Z223.1
- No Additional Allowance is necessary for an ordinary
number of fittings
Fig. 14
12
Length of Black Iron Pipe, Feet
20
30
40
50
60
152
130
115
105
285
245
215
195
590
500
440
400
40
50
60
41
37
34
83
75
68
162
144
131
* EHD = Equivalent Hydraulic Diameter. The greater the
325
292
267
value of EHD, the greater the gas capacity of the tubing
Black Iron Pipe
Lenght of pipe, Feet
40
50
60
80
100
125
84
74
155
292
70
80
90
100
125
96
90
84
79
72
180
170
160
150
130
370
350
320
305
275
* EHD = Equivalent Hydraulic Diameter. The greater the
value of EHD, the greater the gas capacity of the tubing.
Length of Flexible Corrugated Stainless Steel Tubing (CSST), Feet
Tube
size
inches
150
200
67
58
1/2
18 EHD 129 91
140
120
3/4
23 EHD 254 183
265
227
1
30 EHD 521 365
1 1/4
37 EHD 971 661
Outside
diameter
Inch
10
3/8
39
1/2
92
5/8
199 131 107
3/4
329 216 181 145 131 121 112 104
150
175
200
64
59
55
120
110
100
250
225
210
.
EHD*
10
20
30
40
74
64
151
131
297
256
528
449
Copper (LP gas only)
Length of Tubing, Feet
20
30
40
50
60
70
26
21
19
_
_
_
62
50
41
37
35
31
90
79
72
67
50
60
58
53
118 107
227 207
397 359
80
90
100
_
_
_
29
27
26
62
59
55
95
90
6 720 606 518
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