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Table 3. Maximum Undiluted Propane (LP) Delivery Capacity in Thousands of
BtuH (0.5" WC Pressure Drop) [Schedule 40 Metalic Pipe]
Pipe
10'
20'
Size
(3m)
(6m)
1/2"
275
189
3/4"
567
393
1"
1,071
732
1 1/4"
2,205
1,496
1 1/2"
3,307
2,299
2"
6,221
4,331
For reference only. Please consult gas pipe manufacturer for actual pipe capacities.
Final Check
When the installation is complete, verify that inlet gas pressure for the entire gas system does not
drop below 5" WC for NG or 8" WC for LP at all appliances. This can be tested by turning on all
gas burning appliances including the water heater, then check the inlet pressure at each appliance
to verify all appliances are receiving a minimum of 5" WC for NG or 8" WC for LP. If all appliances
are not receiving the minimum inlet pressure the gas piping system may need to be changed.
Length (including ttings)
30'
40'
50'
(9m)
(12m)
(15m)
152
129
114
315
267
237
590
504
448
1,212
1039
913
1,858
1,559
1,417
3,465
2,992
2,646
60'
70'
80'
(18m)
(21m)
(24m)
103
96
89
217
196
185
409
378
346
834
771
724
1,275
1,181
1,086
2,394
2,205
2,047
CAUTION
90'
100'
125'
(27m)
(30m)
(38m)
83
78
69
173
162
146
322
307
275
677
630
567
1,023
976
866
1,921
1,811
1,606
150'
200'
(45m)
(60m)
63
55
132
112
252
213
511
440
787
675
1,496
1,260
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