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4.8.2 Gas Line Sizing Tables for LP GAS
For your convenience see below for an excerpt from gas line sizing tables for a single LP appliance. Their intended use is for pipe
sizing between the 2nd stage (low pressure) regulator and the appliance. For details see the current NFPA 54 or NFPA 58.
Required input for C 950 (Pro TL 175 C) is 175000 BTU/hr and 199000 BTU/hr for the C 1050 (Pro TL 199 C). The gas supply
system must be sized for the combined total maximum BTU/hr load requirements of all gas appliances running simultaneously.
The tables below show the maximum capacity of the gas supply pipe in thousands of BTU per hour of Undiluted LP Gas at 11" W.C
(0.4 psig or 27.4 mbar) based on a pressure drop of 0.5" W.C (1.25 mbar).
Nominal Iron
Internal
Pipe inches
Diameter
inches
1/2
0.622
3/4
0.824
1
1.049
Table 40
Tube size,
inches
EHD*
3/4
23
3/4
23
1
30
1
31
Table 41
* EHD = Equivalent Hydraulic Diameter. The greater the value of EHD, the greater the gas capacity of the tubing.
Nominal Iron
Internal
Pipe inches
Diameter
inches
5/8
0.527
3/4
0.652
Table 42
Maximum Capacity of Semi-Rigid (flexible, non corrugated) Tubing in Thousands of BTU/hr 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.
C 950/C 1050 (Pro TL 175 C/199 C) – 6 720 805 440 (2019/10)
Length of Black iron Pipe (Schedule 40 Metallic Pipe), Feet
10
20
30
291
200
160
608
418
336
1150
787
632
Length of Corrugated Stainless Steel Tubing (CSST),
Feet
10
20
30
254
183
151
303
216
177
521
365
297
605
425
344
Length of Semirigid (soft) Copper ACR Tubing, Feet
10
20
188
129
329
226
40
50
137
122
287
255
541
480
40
50
60
131
118
107
153
137
126
256
227
207
297
265
241
30
104
182
Installation instructions
60
80
110
101
231
212
434
400
70
80
90
99
94
90
117
109
102
191
178
169
222
208
197
40
50
89
79
155
138
100
94
197
372
100
85
98
159
186
43
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