6 720 817 281 (2017/05)
Greentherm 9800 SEO 160/199 | SECO 199
Installation instructions | 17
6.1.1 Gas Line Sizing Tables for NATURAL GAS
For your convenience see below for an excerpt from gas line sizing tables for a single NG appliance. For details see the current NFPA
54.
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 cubic feet per hour. Please contact your local gas supplier
for the energy content of the gas to determine the BTU/hr capacity. Use 1,000 BTU/cubic foot for rough estimations.
Maximum pipe capacity in cubic feet of Natural Gas per hour for gas pressures of <2.0 psig (55" WC or 138 mbar) and a pressure
drop of 3.0" W.C. (7.5 mbar) based on 0.60 specific gravity gas).
Maximum pipe capacity in cubic feet of Natural Gas per hour for gas pressures of <2.0 psig (55" WC or 138 mbar) and a pressure
drop of 3.0" W.C. (7.5 mbar) based on 0.60 specific gravity gas).
* EHD = Equivalent Hydraulic Diameter. The greater the value of
EHD, the greater the gas capacity of the tubing.
Initial Supply Pressure of 8.0" w.c. or Greater
Nominal
Iron Pipe
Size, inches
Internal
Diameter
inches
Length of Black Iron Pipe (Schedule 40 Metallic Pipe), Feet
10
20
30
40
50
60
70
80
90
100
½
0.622
454
312
250
214
190
172
158
147
138
131
¾
0.824
949
652
524
448
397
360
331
308
289
273
1
1.049
1787
1228
986
844
748
678
624
580
544
514
Table 5
Initial Supply Pressure of 8.0" w.c. or Greater
Length of Corrugated Stainless Steel Tubing (CSST), Feet
EHD*
10
20
30
40
50
60
70
80
90
100
30
828
580
471
407
363
330
305
285
268
251
31
958
672
546
471
421
383
355
331
311
295
37
1,530
1,090
895
778
698
639
593
555
524
498
Table 6
