6 720 817 281 (2017/05)
Greentherm 9800 SEO 160/199 | SECO 199
18 | Installation instructions
6.1.2 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 160000 / 199000 BTU/hr for the Greentherm 9800 SE / SEC O. 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).
* EHD = Equivalent Hydraulic Diameter. The greater the value of
EHD, the greater the gas capacity of the tubing.
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.
Pipe Sizing Between Single- or Second-Stage (Low-Pressure) Regulator and Appliance
Nominal
Iron
Pipe inches
Internal
Diameter
inches
Length of Pipe, Feet
10
20
30
40
50
60
80
100
1/2
0.622
291
200
160
137
122
110
101
94
3/4
0.824
608
418
336
287
255
231
212
197
1
1.049
1150
787
632
541
480
434
400
372
Table 7
CSST Sizing Between Single- or Second-Stage (Low-Pressure) Regulator and Appliance Shutoff Valve
EHD*
Length of Pipe, Feet
10
20
30
40
50
60
70
80
90
100
23
254
183
151
131
118
107
99
94
90
85
25
303
216
177
153
137
126
117
109
102
98
30 521
365
297
256
227
207
191
178
169
159
31
605
425
344
297
265
241
222
208
197
186
Table 8
Tube Sizing Between Single- or Second-Stage (Low-Pressure) Regulator and Appliance
Nominal
Iron
Pipe
inches
Internal
Diameter
inches
Length of Pipe, Feet
10
20
30
40
50
5/8
0.527
188
129
104
89
79
3/4
0.652
329
226
182
155
138
Table 9
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